C Letters indicating the engine's configuration:
I Fuel injected
O Opposed type (pancake-style)
X X-type engine
R Radial type engine
G Engine is geared
T Engine is turbocharged
S Engine is supercharged
L Engine is left-turning
A Engine is designed for aerobatics (DRY SUMP)
AE Engine is designed for aerobatics (WET SUMP)
M Engine is designed for unmanned drone (UNCERTIFIED)
H Engine is designed for helicopter installation
V Engine is designed to have the crankshaft in the
vertical, not horizontal, plane. Usually implies
"H"
D The engine's displacement in cubic inches.
M Configuration. Includes power rating, nose section,
accessory section, counterweight application, and
magneto application.
Example from the Lycoming Overhaul manual:
TIO-541-E1B4D
Where:
TIO - The prefix as described above.
541 - The engine's cubic inch displacement, as described
above. A 1 at the end indicates an integral
accessory drive (e.g. TIO-541) except for the
76 series engines (see below).
E - Power section and power rating for the displacement
1 - Nose section (provisions for a prop governor,
hollow/solid crankshaft, prop governor
location)
B - Accessory section (fuel pump type, accy pad(s), etc.)
4 - Counterweight application (if applicable, see the power
section to determine this)
D - Dual magneto (if applicable)
| Model | HP | T/O RPM |
Fuel | C.R. | DESCRIPTION | Suffix | |
|---|---|---|---|---|---|---|---|
| O-235-C1 | 115 | 2800 | 80 | 6.75:1 | Basic engine | -15 | |
| O-235-C1B | 115 | 2800 | 80 | 6.75:1 | Same as -C1 with Retard Breaker Magnetos | -15 | |
| O-235-C1C | 115 | 2800 | 80 | 6.75:1 | Same as -C1 but with Slick Magnetos | -15 | |
| O-235-C2A | 115 | 2800 | 80 | 6.75:1 | Same as -C1 but has AS-127, Type 1 propeller flange | -15 | |
| O-235-C2B | 115 | 2800 | 80 | 6.75:1 | Same as -C2A with -1200 series Magnetos | -15 | |
| O-235-C2C | 115 | 2800 | 80 | 6.75:1 | Similar to -C2A but with Slick Magnetos | -15 | |
| O-235-E1 | 115 | 2800 | 80 | 6.75:1 | Same as -C1 but has provision for controllable prop. | -15 | |
| O-235-E1B | 115 | 2800 | 80 | 6.75:1 | Same as -C1B but has provision for controllable prop. | -15 | |
| O-235-E2A | 115 | 2800 | 80 | 6.75:1 | Same as -C2A but has provision for controllable prop. | -15 | |
| O-235-E2B | 115 | 2800 | 80 | 6.75:1 | Same as -C2B but has provision for controllable prop. | -15 | |
| O-235-F1 | 125 | 2800 | 100/100LL | 9.70:1 | Similar to -C1 but higher power and comp. ratio | -15 | |
| O-235-F1B | 125 | 2800 | 100/100LL | 9.70:1 | Similar to -C1B but higher power and comp. ratio | -15 | |
| O-235-F2A | 125 | 2800 | 100/100LL | 9.70:1 | Similar to -C2A but higher power and comp. ratio | -15 | |
| O-235-F2B | 125 | 2800 | 100/100LL | 9.70:1 | Similar to -C2B but higher power and comp. ratio | -15 | |
| O-235-G1 | 125 | 2800 | 100/100LL | 9.70:1 | Same as -F1 but with provision for controllable prop. | -15 | |
| O-235-G1B | 125 | 2800 | 100/100LL | 9.70:1 | Same as -F1I but with provision for controllable prop. | -15 | |
| O-235-G2A | 125 | 2800 | 100/100LL | 9.70:1 | Same as -F2A but with provision for controllable prop. | -15 | |
| O-235-G2B | 125 | 2800 | 100/100LL | 9.70:1 | Same as -F2B but with provision for controllable prop. | -15 | |
| O-235-H2C | 115 | 2800 | 80 | 6.75:1 | Same as -C2C but with Type 1 dynafocal mounts | -15 | |
| O-235-J2A | 125 | 2800 | 100/100LL | 9.70:1 | Same as -F2A but with Type 1 dynafocal mounts | -15 | |
| O-235-J2B | 125 | 2800 | 100/100LL | 9.70:1 | Same as -F2B but with Hope 1 dynafocal mounts | -15 | |
| O-235-K2A | 118 | 2800 | 100/100LL | 8.50:1 | Same as -F2A but with 20_ BTC timing, lower comp. ratio and lower power | -15 | |
| O-235-K2B | 118 | 2800 | 100/100LL | 8.50:1 | Same as -F2B but with 20_ BTC timing, lower comp. ratio and lower power | -15 | |
| O-235-K2C | 118 | 2800 | 100/100LL | 8.50:1 | Same as -K2A but with Slick Magnetos | -15 | |
| O-235-L2A | 118 | 2800 | 100/100LL | 8.50:1 | Same as -J2A but with 20_ timing, lower comp. ratio and lower power | -15 | |
| O-235-L2C | 118 | 2800 | 100/100LL | 8.50:1 | Same as -L2A but with Slick Magnetos | -15 | |
| O-235-M1 | 118 | 2800 | 100/100LL | 8.50:1 | Similar to -L2A but with provision for controllable prop. and has AS-127, Type 2 prop. flange | -15 | |
| O-235-M2C | 118 | 2800 | 100/100LL | 8.50:1 | Similar to -M1 but has AS-127, Type 1 propeller flange and Slick magnetos. | -15 | |
| O-235-M3C | 118 | 2800 | 100/100LL | 8.50:1 | Similar to -M1 but has Slick magnetos and uses 7/16 inch propeller bolts instead of 3/8 inch bolts. | -15 | |
| O-235-N2A | 116 | 2800 | 100/100LL | 8.10:1 | Same as -L2A but lower comp. ratio and power | -15 | |
| O-235-N2C | 116 | 2800 | 1O0/100LL | 8.10:1 | Same as -L2C but lower comp. ratio and power | -15 | |
| O-235-P1 | 116 | 2800 | 100/100LL | 8.10:1 | Same as -M1 but lower comp. ratio and power | -15 | |
| O-235-P2A | 116 | 2800 | 100/100LL | 8.10:1 | Similar to -P1 but has AS-127, Type 1 propeller flange | -15 | |
| O-235-P2C | 116 | 2800 | 10O/100LL | 8.10:1 | Same as -M2C but lower comp. ratio and power | -15 | |
| O-235-P3C | 116 | 2800 | 1OO/100LL | 8.10:1 | Same as -M3C but lower comp. ratio and power | -15 | |
| Model | HP | T/O RPM |
Fuel | C.R. | DESCRIPTION | Suffix | |
| O-290-D | 130 | 2800 | 80 | 6.50:1 | Solid tappets, Hydro control | -21 | |
| O-290-11 | 127 | 2800 | 80 | 6.50:1 | Same as O-290-D | -21 | |
| O-290-D2 | 140 | 2800 | 80 | 7.50:1 | Hydraulic tappets, 18 degree spark advance | -21 | |
| O-290-D2A | 140 | 2800 | 80 | 7.50:1 | Same as -D2 but new crankcase for controllable prop. | -21 | |
| O-290-D2B | 140 | 2800 | 80 | 7.00:1 | Same as -D2, 25_ spark advance and lower C.R. | -21 | |
| O-290-D2C | 140 | 2800 | 80 | 7.00:1 | Same as -D2B with Retard Breaker Magnetos | -21 | |
| Model | HP | T/O RPM |
Fuel | C.R. | DESCRIPTION | Suffix | |
| O-320-A1A | 150 | 2700 | 80 | 7.00:1 | Controllable propeller, 25 degree spark advance Bendix S4LN-20 and S4LN-21 Magnetos | -27 | |
| O-320-A1B | 150 | 2700 | 80 | 7.00:1 | Same as -A1A with straight riser in oil sump and -32 carburetor | -27 | |
| O-320-A2A | 150 | 2700 | 80 | 7.00:1 | Same as -A1A but fixed pitch propeller | -27 | |
| O-320-A2B | 150 | 2700 | 80 | 7.00:1 | Same as -A2A with straight riser in oil sump and -32 carburetor | -27 | |
| O-320-A2C | 150 | 2700 | 80 | 7.00:1 | Same as -A2B with Retard Breaker Magnetos | -27 | |
| O-320-A2D | 150 | 2700 | 80 | 7.00:1 | Same as -E3D but with conical mounts and 0-320-A sump and intake pipes | -27 | |
| O-320-A3A | 150 | 2700 | 80 | 7.00:1 | Same as -A1A but uses 7/16 in. dia. propeller bolts | -27 | |
| O-320-A3B | 150 | 2700 | 80 | 7.00:1 | Same as -A3A except for straight riser in oil sump and -32 carburetor | -27 | |
| O-320-A3C | 150 | 2700 | 80 | 7.00:1 | Same as -A3B except for Retard Breaker Magnetos | -27 | |
| O-320-B1A | 160 | 2700 | 100/100LL | 8.50:1 | Same as -A1A but high C.R. | -39 | |
| O-320-B1B | 160 | 2700 | I00/100LL | 8.50:1 | Same as -B1A except for straight riser in od sump and -32 carburetor | -39 | |
| O-320-B2A | 160 | 2700 | 100/100LL | 8.50:1 | Same as -B~ fixed pitch propeller | -39 | |
| O-320-B2B | 160 | 2700 | 100/100LL | 8.50:1 | Same as -B2A except for straight riser in oil sump and -32 carburetor | -39 | |
| O-320-B2C | 160 | 2700 | 100/100LL | 8.50:1 | Same as -B2B except for Retard Breaker Magnetos | -39 | |
| O-320-B2D | 160 | 2700 | 100/100u | 8.50:1 | Same as -DID except fixed propeller and conical mounts | -39 | |
| O-320-B3A | 160 | 2700 | 100/100LL | 8.50:1 | Same as -B1A except for 7/16 inch propeller attaching bolts | -39 | |
| O-320-B3B | 160 | 2700 | 100/100LL | 8.50:1 | Same as -B~ except for 7~6 inch attaching bolts and straight riser in oil sump and -32 carburetor | -39 | |
| O-320-B3C | 160 | 2700 | 100/100LL | 8.50:1 | Same as -B3B except for Retard Breaker Magnetos | -39 | |
| O-320-C1A | 150 | 2700 | 80 | 7.00:1 | Low compression field service conversion of -B1A | -39 | |
| O-320-C1B | 150 | 2700 | 80 | 7.00:1 | Low compression field service conversion of -BIB | -39 | |
| O-320-C2A | 150 | 2700 | 80 | 7.00:1 | Low compression field service conversion of -B2A | -39 | |
| O-320-C2B | 150 | 2700 | 80 | 7.00:1 | Low compression field service corrversion of -B2B | -39 | |
| O-320-C2C | 150 | 2700 | 80 | 7.00:1 | Low compression field service conversion of -B2C | -39 | |
| O-320-C3A | 150 | 2700 | 80 | 7.00:1 | Low compression field service conversion of -B3A | -39 | |
| O-320-C3B | 150 | 2700 | 80 | 7.00:1 | Low compression field service conversion of -B3B | -39 | |
| O-320-C3C | 150 | 2700 | 80 | 7.00:1 | Low compression field service conversion of -B3C | -39 | |
| O-320-D1A | 160 | 2700 | 100/100LL | 8.50:1 | Same as -B3B but with Type 1 dynafocal mounts | -39 | |
| O-320-D1B | 160 | 2700 | 100/100LL | 8.50:1 | Same as -D~ except for Retard Breaker Magnetos | -39 | |
| O-320-D1C | 160 | 2700 | 100/100LL | 8.50:1 | Same as -D2C but with provision for controllable prop. | -39 | |
| O-320-D1D | 160 | 2700 | 100/100LL | 8.50:1 | Similar to -D1A but has horizontal carburetor and in- duction housing and has Slick Magnetos | -39 | |
| O-320-D1F | 160 | 2700 | 100/100LL | 8.50:1 | Same as -E1F except has high compression pistons | -39 | |
| O-320-D2A | 160 | 2700 | 100/100LL | 8.50:1 | Same as -DIA but with fixed pitch propeller and 3/8 in. attaching bolts | -39 | |
| O-320-D2B | 160 | 2700 | 100/100LL | 8.50:1 | Same as -D2A except for Retard Breaker Magnetos | -39 | |
| O-320-D2C | 160 | 2700 | 100/100LL | 8.50:1 | Same as -D2A except for -1200 series Magnetos | -39 | |
| O-320-D2F | 160 | 2700 | 100/100LL | 8.50:1 | Same as -E2F except has high compression pistons | -39 | |
| O-320-D2G | 160 | 2700 | 100/100LL | 8.50:1 | Same as -D2A but with Slick Magnetos, 7/16 instead of 3/8 in. propeller flange bolts | -39 | |
| O-320-D2H | 160 | 2700 | 100/100LL | 8.50:1 | Same as -D2G but with 0-320-B sump and intake pipes and has provision for AC type fuel pump | -39 | |
| O-320-D2J | 160 | 2700 | 100/100LL | 8.50:1 | Similar to -D2G but has (2) Slick impulse coupling magnetos and an unmachined governor pad on front of crankcase | -39 | |
| O-320-D3G | 160 | 2700 | 100/100LL | 8.50:1 | Same as -D2G but with 3/8 in. propeller attaching bolts and has provisions for fuel pump | -39 | |
| O-320-E1A | 150 | 2700 | 80 | 7.00:1 | Same as -A3B but with Type 1 dynafocal mounts | -27 | |
| O-320-E1B | 150 | 2700 | 80 | 7.00:1 | Same as -ETA except for Retard Breaker Magnetos | -27 | |
| O-320-E1C | 150 | 2700 | 80 | 7.00:1 | Same as -ETA but has -1200 series Magnetos | -27 | |
| O-320-E1F | 150 | 2700 | 80 | 7.00:1 | Same as -E1C but with propeller governor drive on left front of crankcase | -27 | |
| O-320-EU | 150 | 2700 | 80 | 7.00:1 | Same as -E1F but has Slick Magnetos | -27 | |
| O-320-E2A | 150/ 140 |
2700/ 2450 |
80 | 7.00:1 | Same as -ETA but with fixed pitch propeller and uses 3/8 inch attaching bolts and has alternate rating of 140 at 2450 RPM. | -27 | |
| O-320-E2B | 150 | 2700 | 80 | 7.00:1 | Same as -E2A except for Retard Breaker Magnetos | -27 | |
| O-320-E2C | 150/ 140 |
2700/ 2450 |
80 | 7.00:1 | Same as -E2A but has -1200 series Magnetos | -27 | |
| O-320-E2D | 150 | 2700 | 80 | 7.00:1 | Similar to -E2A but with Slick Magnetos, O-235 front main bearing and 7/16 inch propeller flange bushings | -27 | |
| O-320-E2F | 150 | 2700 | 80 | 7.00:1 | Same as -E1F but with fixed pitch propeller | -27 | |
| O-320-E2G | 150 | 2700 | 80 | 7.00:1 | Same as -E2D but has 0-320-A sump and intake pipes | -27 | |
| O-320-E2H | 150 | 2700 | 80 | 7.00:1 | Same as -E2D but equipped with S4LN-20 and -21 Mags. | -27 | |
| O-320-E3D | 150 | 2700 | 80 | 7.00:1 | Same as -E2D but uses 3/8 inch instead of 7/16 inch propeller flange bushings | -27 | |
| O-320-E3H | 150 | 2700 | 80 | 7.00:1 | Same as -E3D but equipped with S4LN-20 and -21 Mags. | -27 | |
| O-320-H1AD | 160 | 2700 | 100/100LL | 9.00:1 | Integral accessory section cIankcase, front mounted fuel pump, external mounted oil pump and D4RN-3000 impulse coupling dual magneto | -76 | |
| O-320-H1BD | 160 | 2700 | 100/100LL | 9.00:1 | Same as -H1AD but with D4RN-3200 retard breaker dual magneto | -76 | |
| O-320-H2AD | 160 | 2700 | 100/100LL | 9.00:1 | Same as -H1AD but with fixed pitch propeller | -76 | |
| O-320-H2BD | 160 | 2700 | 100/100LL | 9.00:1 | Same as -H2AD but with D4RN-3200 retard breaker dual magneto | -76 | |
| O-320-H3AD | 160 | 2700 | 100/100LL | 9.00:1 | Same as -H2AD but uses 3/8 inch instead of 7/16 inch propeller flange bushings | -76 | |
| O-320-H3BD | 160 | 2700 | 100/100LL | 9.00:1 | Same as -H3AD but with D4RN-3200 retard breaker dual magneto | -76 | |
| IO-320-A1A | 150 | 2700 | 80 | 7.00:1 | Same as O-320-E1B but with rear Bendix fuel injection and Type 2 dynafocal mounts | -55 | |
| IO-320-A2A | 150 | 2700 | 80 | 7.00:1 | Same as -A1A but with fixed pitch propeller and 3/8 inch propeller flange bushings | -55 | |
| IO-320-B1A | 160 | 2700 | 100/100LL | 8.50:1 | Same as O-320-D1A but with Type 2 dynafocal mounts and rear mounted Bendix fuel injector | -55 | |
| IO-320-B1B | 160 | 2700 | 100/100LL | 8.50:1 | Same as -B1A but has AN fuel pump drive | -55 | |
| IO-320-B1C | 160 | 2700 | 100/100LL | 8.50:1 | Same as -B1A but has adapter for mounting fuel injector straight to the rear | -55 | |
| IO-320-B1D | 160 | 2700 | 100/100LL | 8.50:1 | Same as -B1C but with -1200 series Retard Magnetos | -55 | |
| IO-320-B1E | 160 | 2700 | 100/100LL | 8.50:1 | Same as -D1C but with rear mounted horizontal fuel injector | -55 | |
| IO-320-B2A | 160 | 2700 | 100/100LL | 8.50:1 | Same as -B1A but with fixed pitch propeller and 3/8 inch propeller flange bushings | -55 | |
| IO-320-C1A | 160 | 2700 | 100/100LL | 8.50:1 | Same as -B1A except converted for use with turbocharger, long reach spark plugs, piston cooling oil jets, vented fuel nozzles, two S4LN-21 impulse coupling magnetos and AN fuel pump drive | -55 | |
| IO-320-ClB | 160 | 2700 | 100/100LL | 8.50:1 | Same as -CIA but with fuel injector mounted straight to the rear and 24 volt system standard | -55 | |
| IO-320-D1A | 160 | 2700 | 100/10OLL | 8.50:1 | Same as O-320-D2C except has Bendix RSA-5AD1 fuel injector, provision for controllable propeller and 7/16 inch propeller flange bushings | -55 | |
| IO-320-D1B | 160 | 2700 | 100/100LL | 8.50:1 | Same as -D1A but with propeller governor drive on left front of crankcase | -55 | |
| IO-320-D1C | 160 | 2700 | 100/100LL | 8.50:1 | Same as -D1B but with Slick Magnetos, 24 volt system and 100 amp alternator standard | -55 | |
| IO-320-E1A | 150 | 2700 | 80 | 7.00:1 | Same as O-320-A3B except has Bendix fuel injector | -55 | |
| IO-320-E1B | 150 | 2700 | 80 | 7.00:1 | Same as -ETA but with Slick Magnetos | -55 | |
| IO-320-E2A | 150 | 2700 | 80 | 7.00:1 | Same as -ETA but with fixed pitch propeller and 3/8 inch propeller flange bushings | -55 | |
| IO-320-E2B | 150 | 2700 | 80 | 7.00:1 | Same as O-320-A2D but with Bendix RSA-5AD1 fuel injector | -55 | |
| IO-320-F1A | 160 | 2700 | 100/100LL | 8.50:1 | Same as -CIA but with Type 1 dynafocal mounts | -55 | |
| LIO-320-BlA | 160 | 2700 | 100/100LL | 8.50:1 | Similar to IO-320-BL~ but has left hand rotation crankshaft | -66 | |
| LIO-320-C1A | 160 | 2700 | 100/100LL | 8.50:1 | Similar to IO-320-C1A but has left hand rotation crankshaft | -66 | |
| AIO-320-A1A | 160 | 2700 | 100/100LL | 8.50:1 | Aerobatic engine with performance similar to IO-320-D | -65 | |
| AIO-320-A1B | 160 | 2700 | 100/100LL | 8.50:1 | Same as -A1A but has impulse coupling Magneto | -65 | |
| AIO-320-A2A | 160 | 2700 | 100/100LL | 8.50:1 | Same as -A1A but with fixed pitch propeller | -65 | |
| AIO-320-A2B | 160 | 2700 | 100/100LL | 8.50:1 | Same as -A2A but has impulse coupling Magneto | -65 | |
| AIO-320-B1B | 160 | 2700 | 100/100LL | 8.50:1 | Similar to -A1B but with front mounted fuel injector | -65 | |
| AIO-320-C1B | 160 | 2700 | 100/100LL | 8.50:1 | Similar to -BIB but the fuel injector is vertically mounted on the bottom of the sump | -65 | |
| AEIO-320-D1B | 160 | 2700 | 100/100LL | 8.50:1 | Same as IO-320-D1B but is equipped with Aerobatic kit | -55 | |
| AEIO-320-D2B | 160 | 2700 | 100/100LL | 8.50:1 | Same as -D1B but with fixed pitch propeller | -55 | |
| AEIO-320-E1A | 150 | 2700 | 80 | 7.00:1 | Same as IO-320-E1A but is equipped with Aerobatic kit | -55 | |
| AEIO-320-E1B | 150 | 2700 | 80 | 7.00:1 | Same as IO-320-E1B but is equipped with Aerobatic kit | -55 | |
| AEIO-320-E2A | 150 | 2700 | 80 | 7.00:1 | Same as IO-320-E2A but is equipped with Aerobatic kit | -55 | |
| AEIO-320-E2B | 150 | 2700 | 80 | 7.00:1 | Same as IO-320-E2B but is equipped with Aerobatic kit | -55 | |
| Model | HP | T/O RPM |
Fuel | C.R. | DESCRIPTION | Suffix | |
| O-340-A1A | 170 | 2700 | 100/100LL | 8.50:1 | Controllable propeller | -30 | |
| O-340-A1B | 170 | 2700 | 100/100LL | 8.50:1 | Same as -A1A except for Retard Breaker Magnetos | -30 | |
| O-340-A2A | 170 | 2700 | 100/100LL | 8.50:1 | Same as -A1A but fixed pitch propeller | -30 | |
| O-340-B1A | 160 | 2700 | 80 | 7.15:1 | Low compression -AL9 | -30 | |
| O-340-B2A | 160 | 2700 | 80 | 7.15:1 | Low compression -A2A | -30 | |
| O-360-A1A | 180 | 2700 | 100/100LL | 8.50:1 | Dynafocal mounts | -36 | |
| O-360-A1AD | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A1A but with D4LN-3000 impulse coupling dual magnetos | -36 | |
| O-360-A1C | 180 | 2700 | 100/100LL | 8.50:1 | Similar to -A1A but has horizontal induction housing, Bendix PSH-5BD pressure carburetor and retard breaker magnetos | -36 | |
| O-360-A1D | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A1A except for Retard Breaker Magnetos | -36 | |
| O-360-A1F | 180 | 2700 | 100/100LL | 8.50:1 | Same as -ALA with -1200 series Magnetos | -36 | |
| O-360-A1F6 | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A1F but has (1) sixth and (V eighth order counterweights | -36 | |
| O-360-A1F6D | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A1F6 but with D4LN-3000 impulse coupling dual magnetos | -36 | |
| O-360-A1G | 180 | 2700 | 100/100LL | 8.50:1 | Similar to -A1F but has horizontal carburetor and induction housing | -36 | |
| O-360-A1G6 | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A1G but has (1) sixth and (1) eighth order counterweights | -36 | |
| O-360-A1G6D | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A1G6 but with D4LN-3000 impulse coupling dual magneto | -36 | |
| O-360-A1H | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A1G but with propeller governor drive on left front of crankcase and -21, -204 magnetos | -36 | |
| O-360-A1H6 | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A1H but has (1) sixth and (1) eighth order counterweights | -36 | |
| O-360-A1LD | 180 | 2700 | 100/100LL | 8.50:1 | Similar to -A1A but with D4LN-3000 impulse coupling dual magneto and has propeller governor drive on left front of crankcase | -36 | |
| O-360-A1P* | 180 | 2700 | 100/100LL | 8.50:1 | Same as -C1G except dynafocal mounts | -36 | |
| O-360-A2A | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A1A but fixed pitch propeller | -36 | |
| O-360-A2D | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A2A except for Retard Breaker Magnetos | -36 | |
| O-360-A2E | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A2D with provision for AN fuel pump drive | -36 | |
| O-360-A2F | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A2A with -1200 series Magnetos | -36 | |
| O-360-A2G | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A1G but fixed pitch propeller | -36 | |
| O-360-A2H | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A1H but has fixed pitch propeller | -36 | |
| O-360-A3A | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A2A but has 6 special long bushings in propeller flange | -36 | |
| O-360-A3AD | 180 | 2700 | 100/100LL | 8.50:1 | Same as -~ but with D4LN-3000 impulse coupling dual magneto | -36 | |
| O-360-A3D | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A3A except for Retard Breaker Magnetos | -36 | |
| O-360-A4A | 180 | 2700 | I00/100LL | 8.50:1 | Same as -A3A but has solid crankshaft | -36 | |
| O-360-A4AD | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A4A but with D4LN-3000 impulse coupling dual magneto | -36 | |
| O-360-A4D | 180 | 2700 | 100/100LL | 8.50:1 | Similar to -A4A except with Retard Breaker Magnetos, (2) magneto drive isolators and -A2A propeller flange bushings | -36 | |
| O-360-A4G | 180 | 2700 | 100/1O0LL | 8.50:1 | Same as -A2G but has -A4A crankshaft with -A2G propeller flange bushings | -36 | |
| O-360-A4J | 180 | 2700 | 1O0/100LL | 8.50:1 | Same as -A4G but has -21 and -204 Magnetos | -36 | |
| O-360-A4K | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A4J but with Slick Magnetos | -36 | |
| O-360-A4M | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A4A but with Slick Magnetos | -36 | |
| O-360-A4N | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A4M but has an unmachined governor pad on front of crankcase and -A2G propeller flange bushings | -36 | |
| O-360-A4P* | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A4M except for propeller flange bushings | -36 | |
| O-360-A5AD | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A4AD but has standard length propeller flange bushings | -36 | |
| O-360-B1A | 168 | 2700 | 80 | 7.20:1 | Same as -A1A but low compression ratio | -36 | |
| O-360-B1B | 168 | 2700 | 80 | 7.20:1 | Same as -B1A except for Retard Breaker Magnetos | -36 | |
| O-360-B2A | 168 | 2700 | 80 | 7.20:1 | Same as -B1A except for fixed pitch propeller | -36 | |
| O-360-B2B | 168 | 2700 | 80 | 7.20:1 | Same as -B2A except for Retard Breaker Magnetos | -36 | |
| O-360-B2C | 168 | 2700 | 80 | 7.20:1 | Same as -B2A except has IO-360-A crank and rods | -36 | |
| O-360-C1A | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A1A but conical rubber mounts | -36 | |
| O-360-C1C | 180 | 2700 | 100/100LL | 8.50:1 | Same as -CIA except for Retard Breaker Magnetos | -36 | |
| O-360-C1E | 180 | 2700 | 100/100LL | 8.50:1 | Same as -CIA but with Slick Magnetos | -36 | |
| O-360-C1F | 180 | 2700 | 100/100LL | 8.50:1 | Same as -A1G with conical mounts and Slick magnetos | -36 | |
| O-360-C1G | 180 | 2700 | 100/100LL | 8.50:1 | Same as -CIA but with propeller governor drive on left front of crankcase | -36 | |
| O-360-C2A | 180 | 2700 | 100/100LL | 8.50:1 | Same as -CIA but fixed pitch propeller | -36 | |
| O-360-C2B | 180 | 2700 | 100/100LL | 8.50:1 | Same as -CIA but fixed pitch propeller and horizontal pressure carburetor and has helicopter rating | -36 | |
| O-360-C2C | 180 | 2700 | 100/100LL | 8.50:1 | Same as -C2A except for Retard Breaker Magnetos | -36 | |
| O-360-C2D | 180 | 2700 | 100/100LL | 8.50:1 | Same as -C2B except for Retard Breaker Magnetos | -36 | |
| O-360-C2E | 180 | 2700 | 100/100LL | 8.50:1 | Same as -C2A but with Slick Magnetos | -36 | |
| O-360-C4F | 180 | 2700 | 100/100LL | 8.50:1 | Same as -C1F except has solid crankshaft and no provision for propeller governor | -36 | |
| O-360-C4P | 180 | 2700 | 1O0/100LL | 8.50:1 | Same as -A4M except for propeller flange bushings and conical mounts | -36 | |
| O-360-D1A | 168 | 2700 | 80 | 7.20:1 | Same as -B1A but conical rubber mounts and -1200 series magnetos | -36 | |
| O-360-D2A | 168 | 2700 | 80 | 7.20:1 | Same as -B2A but conical rubber mounts | -36 | |
| O-360-D2B | 168 | 2700 | 80 | 7.20:1 | Same as -D2A except for Retard Breaker Magnetos | -36 | |
| O-360-E1A6D | 1130 | 2700 | 100/100LL | 9.00:1 | Integral accessory section crainkcase, front mounted fuel pump, external oil pump, D4RN-3000 impulse coupling dual magnetos and counterweighted crankshaft | -77 | |
| O-360-F1A6 | 180 | 2700 | 100/100LL | 8.50:1 | Similar to O-360-A series with new sump for nose wheel clearance, rear HA-6 carburetor, has (1) sixth and (1) eigth order counterweights and has propeller governor drive on left front of crankcase | -36 | |
| O-360-G1A6 | 180 | 2700 | 100/100LL | 8.50:1 | Same as -F1A6 but with a machined pad on right front of crankcase | -36 | |
| HO-360-A1A | 180 | 2700 | 100/100LL | 8.50:1 | Same as 0-360-A2D but with MA-4-SAA carburetor and type 2 dynafocal mounts | -36 | |
| HO-360-B1A | 180 | 2900 | 100/100LL | 8.50:1 | Same as 0-360-C2D except for rated speed | -36 | |
| HO-360-B1B | 180 | 2900 | 100/100LL | 8.50:1 | Same as -B1A but with two (2) S4LN-200 Magnetos | -36 | |
| IO-360-A1A | 200 | 2700 | 100/100LL | 8.70:1 | Bendix fuel injection, tuned induction | -51 | |
| IO-360-A1B | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A1A but has -1200 series impulse coupling magnetos | -51 | |
| IO-360-A1B6 | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A1B but has (1) sixth and (1) eighth order counterweights | -51 | |
| IO-360-A1B6D | 200 | 2700 | 100/10OLL | 8.70:1 | Same as -A1B6 but has (1) Bendix D4LN-3000 impulse coupling dual Magneto | -51 | |
| IO-360-A1C | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A1A but with -1200 series Magnetos | -51 | |
| IO-360-A1D | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A1B but has S4LN-21 impulse coupling and S4LN-204 Magnetos | -51 | |
| IO-360-A1D6 | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A1B6 but with propeller governor drive on left front of crankcase | -51 | |
| IO-360-A1D6D | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A1D6 but has (1) Bendix D4LN-3000 impulse coupling dual magneto | -51 | |
| IO-360-A2A | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A1A but fixed pitch propeller | -51 | |
| IO-360-A2B | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A2A but has -1200 series impulse Magnetos | -51 | |
| IO-360-A2C | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A1C but has fixed pitch propeller | -51 | |
| IO-360-A3B6 | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A1B6 with propeller flange bushings rotated 120 degrees clockwise | -51 | |
| IO-360-A3B6D | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A1B6D but with propeller locating bushings rotated 120 degrees clockwise | -51 | |
| IO-360-A3D6D | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A1D6D but with propeller locating bushings rotated 120 degrees clockwise | -51 | |
| IO-360-B1A | 180 | 2700 | 100/100LL | 8.50:1 | Same as O-360-A1D except for Simmonds 530 Fuel Injection System | -51 | |
| IO-360-B1B | 180 | 2700 | 100/100LL | 8.50:1 | Same as -B1A except for Bendix Fuel Injection System | -51 | |
| IO-360-B1C | 177 | 2700 | 100/100LL | 8.50:1 | Conversion of O-360-A1C to Bendix Fuel Injection | -51 | |
| IO-360-B1D | 180 | 2700 | 100/100LL | 8.50:1 | Same as -BIB but with AN fuel pump drive | -51 | |
| IO-360-B1E | 180 | 2700 | 100/1OOLL | 8.50:1 | Similar to -BIB with rear mounted fuel injection and -1200 series impulse coupling magnetos | -51 | |
| IO-360-B1F | 180 | 2700 | 100/100LL | 8.50:1 | Similar to -BIB except has (2) -1227 Magnetos | -51 | |
| IO-360-B1F6 | 180 | 2700 | 100/100LL | 8.50:1 | Same as -B1F but with one (V sixth and (1) eighth order counterweights | -51 | |
| IO-360-B2E | 180 | 2700 | 100/100LL | 8.50:1 | Same as -B1E but has Wed pitch propeller | -51 | |
| IO-360-B2F | 180 | 2700 | 100/100LL | 8.50:1 | Same as -B1F but fixed pitch propeller | -51 | |
| IO-360-B2F6 | 180 | 2700 | 100/100LL | 8.50:1 | Same as -B2F but with one a) sixth and one (1) eighth order counterweights | -51 | |
| IO-360-B4A | 180 | 2700 | 100/100LL | 8.50:1 | Similar to -BIB but has S4LN-21 (impulse coupling) and S4LN-20 magnetos and O-360-A4A solid crankshaft | -51 | |
| IO-360-C1A | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A~ but with rear air inlet | -51 | |
| IO-360-C1B | 200 | 2700 | 100/100LL | 8.70:1 | Same as -CIA but with -1200 series Magnetos | -51 | |
| IO-360-C1C | 200 | 2700 | I00/100LL | 8.70:1 | Similar to -C1B but has 14_ injector adapter and impulse Magneto | -51 | |
| IO-360-C1C6 | 200 | 2700 | 100/1OOLL | 8.70:1 | Same as -C1C but with one (1) sixth and one (1) eighth order counterweights | -51 | |
| IO-360-C1D6 | 200 | 2700 | 100/100LL | 8.70:1 | Similar to -C1C but has straight injector inlet and has (1) sixth and (1) eighth order counterweights | -51 | |
| IO-360-C1E6 | 200 | 2700 | 100/100LL | 8.70:1 | Similar to -C1C but has propeller governor drive on left front of crankcase, has (1) sixth and (1) eighth order counterweights | -51 | |
| IO-360-C1E6D | 200 | 2700 | 100/100LL | 8.70:1 | Same as -C1E6 but with D4LN-3000 impulse coupling dual Magneto | -51 | |
| IO-360-C1F | 200 | 2700 | 100/100LL | 8.70:1 | Same as -C1C but with AN fuel pump drive and pump | -51 | |
| IO-360-D1A | 200 | 2700 | 100/100LL | 8.70:1 | Same as -C1B but has Type 2 dynafocal mounts | -51 | |
| IO-360-E1A | 180 | 2700 | 100/100LL | 8.50:1 | Similar to -B1E but has Type 2 dynafocal mounts and Retard Breaker Magnetos | -51 | |
| IO-360-FlA | 180 | 2700 | 100/100LL | 8.50:1 | Similar to -B1E except converted for use with turbocharger | -51 | |
| IO-360-J1AD | 200 | 2700 | 100/10LL | 8.70:1 | Similar to -A1B except equipped with a D4LN-3000 dual magneto and has a rear type engine mount similar to TO-360-F1A6D | -51 | |
| IO-360-J1A6D | 200 | 2700 | 100/100LL | 8.70:1 | Same as -J~D but with O) sixth and (1) eighth order counterweights. | -51 | |
| IO-360-K2A | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A2A but has Bendix S4LN-21 impulse coupling and S4LN-20 magnetos and provision for straight conical mounts | -51 | |
| LO-360-A1G6D | 180 | 2700 | 100/100LL | 8.50:1 | Similar to O-360-A1G6D but has left hand rotation crankshaft | -71 | |
| LO-360-A1H6 | 180 | 2700 | 100/100LL | 8.50:1 | Similar to O-360-A1H6 but has left hand rotation crankshaft | -71 | |
| LO-360-E1A6D | 180 | 2700 | 100/100LL | 9.00:1 | Similar to O-360-ELA6D but has left hand rotation crankshaft | -72 | |
| TO-360-A1A6D | 200 | 2575 | 100/100LL | 8.00:1 | Similar to 0-360-A1F6D but with HA-6 horizontal carburetor ahead of Rajay turbocharger, lower speed, lower C.R. and higher power | -69 | |
| TO-360-C1A6D | 210 | 2575 | 100/100LL | 7.30:1 | Similar to -A1A6D except for rating, compression ratio, carburetor and turbocharger location and turbocharger controls | -69 | |
| TO-360-E1A6D | 180 | 2575 | 100/100LL | 8.00:1 | Similar to O-360-ELA6D but with AiResearch TA04 Turbocharger, lower speed and lower compression ratio | -73 | |
| TO-360-F1A6D | 210 | 2575 | 100/100LL | 7.30:1 | Same as -C1A6D with long type 1.12,, conical mount | -69 | |
| VO-360-A1A | 180 | 2900 | 100/100LL | 8.50:1 | Vertical crankshaft (Brantly Modification) | -45 | |
| VO-360-A1B | 180 | 2900 | 100/100LL | 8.50:1 | Same as -A1A except for altitude compensated carburetor and retard Breaker Magnetos | -45 | |
| VO-360-B1A | 180 | 2900 | 100/100LL | 8.50:1 | Same as -A1B but with piston cooling oil jets | -45 | |
| AIO-360-A1A | 200 | 2700 | 100/100LL | 8.70:1 | Aerobatic engine with performance similar to IO-360-A1A | -63 | |
| AIO-360-A1B | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A1A but has impulse Magnetos | -63 | |
| AIO-360-A2A | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A1A but does not have provision for controllable propeller | -63 | |
| AIO-360-A2B | 200 | 2700 | 100/100LL | 8.70:1 | Same as -A2A but has impulse Magnetos | -63 | |
| AIO-360-B1B | 200 | 2700 | 100/100LL | 8.70:1 | Similar to -A1B but with front mounted fuel injector | -63 | |
| HIO-360-A1A | 180 | 2900 | 100/100LL | 8.70:1 | Rated power to 3900 feet, imilar to HO-360-B1B but has Bendix fuel injector, angle valve cylinders and higher C.R. | -51 | |
| HIO-360-A1B | 180 | 2900 | 100/100LL | 8.70:1 | Similar to -A1A except conical mounts, no AMC unit on fuel injector and 90_ fuel injector mount | -51 | |
| HIO-360-B1A | 180 | 2900 | 100/100LL | 8.50:1 | Similar to HO-360-B1B but has Bendix fuel injector and dual diaphragm fuel pump | -51 | |
| HIO-360-B1B | 180 | 2900 | 100/100LL | 8.50:1 | Same as -B1A but has AN fuel pump drive | -51 | |
| HIO-360-C1A | 205 | 2900 | 100/100LL | 8.70:1 | Similar to -A1A but has higher sea level rating and type 2 dynafocal mounts | -51 | |
| HIO-360-C1B | 205 | 2900 | 100/100LL | 8.70:1 | Same as -CIA but has -1200 series Magnetos | -51 | |
| HIO-360-D1A | 190 | 3200 | 100/100LL | 10.00:1 | Similar to -A1A but has -1200 series Magnetos and Bendix RSA-7AA1 fuel injector | -51 | |
| HIO-360-E1AD | 190 | 2900 | 100/100LL | 8.00:1 | Similar to -CIA except for compression ratio, rating D4LN-3000 impulse coupling dual magneto and provision for turbocharging | -51 | |
| HIO-360-E1BD | 190 | 2900 | 1O0/100LL | 8.00:1 | Same as -E1AD but has D4LN-3200 Retard Breaker Magneto | -51 | |
| HIO-360-FlAD | 190 | 3050 | 100/100LL | 8.00:1 | Similar to -E1AD but has heavier crankshaft, and higher RPM | -51 | |
| IVO-360-A1A | 180 | 2900 | 100/100LL | 8.50:1 | Same as VO-360-B1A but with Bendix Fuel Injection | -58 | |
| LIO-360-C1E6 | 200 | 2700 | 100/100LL | 8.70:1 | Similar to IO-360-C1E6 but has left hand rotation crankshaft | -67 | |
| LTO-360-A1A6D | 200 | 2575 | 100/100LL | 8.00:1 | Similar to TO-360-MA6D but has left hand rotation crankshaft | -70 | |
| LTO-360-E1A6D | 180 | 2575 | 100/100LL | 8.00:1 | Similar to TO-360-E1A6D but has left hand rotation crankshaft | -74 | |
| TIO-360-A1A | 200 | 2575 | 100/100LL | 7.30:1 | Similar to IO-360-C1B but has turbocharger (TE0659) and lower rated speed | -64 | |
| TIO-360-A1B | 200 | 2575 | 100/100LL | 7.30:1 | Same as -A1A but does not have suck-open door | -64 | |
| TIO-360-A3B6 | 200 | 2575 | 100/100LL | 7.30:1 | Similar to -A1B but has (1) sixth and (1) eighth order counterweights, provision for 3-bladed propeller, large fuel pump, conduit harness and pressurized Mags. | -64 | |
| TIO-360-C1A6D | 210 | 2575 | 100/100LL | 7.30:1 | Same as TO-360-C1A6D but has a Bendix RSA-5AD1 Fuel Injector | -64 | |
| LHIO-360-C1A | 205 | 2900 | 100/100LL | 8.70:1 | Similar to HIO-360-C1A but has left hand rotation crankshaft | -67 | |
| LHIO-360-C1B | 205 | 2900 | 100/100LL | 8.70:1 | Similar to HIO-360-C1B but has left hand rotation crankshaft | -67 | |
| LHIO-360-F1AD | 190 | 3050 | 100/100LL | 8.00:1 | Similar to HIO-360-F1AD but has left hand rotation crankshaft | -67 | |
| AEIO-360-A1A | 200 | 2700 | 100/100LL | 8.70:1 | Same as IO-360-A1A but is equipped with Aerobatic kit | -51 | |
| AEIO-360-A1B | 200 | 2700 | 100/100LL | 8.70:1 | Same as IO-360-A1B but is equipped with Aerobatic kit | -51 | |
| AEIO-360-A1B6 | 200 | 2700 | 100/100LL | 8.70:1 | Same as IO-360-A1B6 but is equipped with Aerobatic kit | -51 | |
| AEIO-360-A1C | 200 | 2700 | 100/100LL | 8.70:1 | Same as IO-360-A1C but is equipped with Aerobatic kit | -51 | |
| AEIO-360-A1D | 200 | 2700 | 100/100LL | 8.70:1 | Same as IO-360-A1D but is equipped with Aerobatic kit | -51 | |
| AEIO-360-A1E | 200 | 2700 | 100/100LL | 8.70:1 | Same as -AID but with prop. governor drive on left front of crankcase | -51 | |
| AEIO-360-A1E6* | 200 | 2700 | 100/l00LL | 8.70:1 | Same as -ATE but has (1) sixth and (1) eighth order counterweights | -51 | |
| AEIO-360-A2A | 200 | 2700 | 100/lO0LL | 8.70:1 | Same as IO-360-A2A but is equipped with Aerobatic kit | -51 | |
| AEIO-360-A2B | 200 | 2700 | 100/l00LL | 8.70:1 | Same as IO-360-A2B but is equipped with Aerobatic kit | -51 | |
| AEIO-360-A2C | 200 | 2700 | 100/100LL | 8.70:1 | Same as IO-360-A2C but is equipped with Aerobatic kit | -51 | |
| AEIO-360-B1B | 180 | 2700 | 100/100LL | 8.50:1 | Same as IO-360-B1B but is equipped with Aerobatic kit | -51 | |
| AEIO-360-B1D | 180 | 2700 | 100/100LL | 8.50:1 | Same as IO-360-B1D but is equipped with Aerobatic kit | -51 | |
| AEIO-360-B1F | 180 | 2700 | 100/100LL | 8.50:1 | Same as IO-360-B1F but is equipped with Aerobatic kit | -51 | |
| AEIO-360-B1F6 | 180 | 2700 | 100/100LL | 8.50:1 | Same as IO-360-B1F6 but is equipped with Aerobatic kit | -51 | |
| AEIO-360-B1G6 | 180 | 2700 | 100/100LL | 8.50:1 | Same as -B1F6 but with Slick Magnetos | -51 | |
| AEIO-360-B2F | 180 | 2700 | 100/100LL | 8.50:1 | Same as IO-360-B2F but is equipped with Aerobatic kit | -51 | |
| AEIO-360-B2F6 | 180 | 2700 | 100/100LL | 8.50:1 | Same as IO-360-B2F6 but is equipped with Aerobatic kit | -51 | |
| AEIO-360-B4A | 180 | 2700 | 100/100LL | 8.50:1 | Same as IO-360-B4A but is equipped with Aerobatic kit | -51 | |
| AEIO-360-H1A | 180 | 2700 | 100/100LL | 8.50:1 | Similar to 0-360-C2E but with provision for controllable propeller, an RSA-5AD1 fuel injector, high pressure fuel pump and is equipped with Aerobatic kit | -51 |
| Model | HP | T/O RPM |
Fuel | C.R. | DESCRIPTION | Suffix |
|---|---|---|---|---|---|---|
| O-435-A | 190 | 2550 | 80 | 6.50:1 | Rear mounted automotive type accessories | -17 |
| O-435-A2 | 225 | 2550 | 100/100LL | 7.50:1 | Same as -A except C.R. | -17 |
| O-435-4 | 225 | 3000 | 100/100LL | 6.50:1 | Kaman Helicopter Std. rear mounted accessories less 35-KV generator drive | -25 |
| GO-435-C2(11) | 260 | 3400 | 80 | 7.30:1 | Fuel grade depends on carburetor setting Ryan Navion MA-4-5 carburetor _ | -11 |
| GO-435-C2(11A) | 260 | 3400 | 80 | 7.30:1 | Beech, PS-5 carburetor, dual governor and vacuum pump drive | -11A |
| GO-435-C2(11B) | 260 | 3400 | 80 | 7.30:1 | Aero Commander; PS-5 carburetor no dual drive | -11B |
| GO-435-C2A | 260 | 3400 | 80 | 7.30:1 | Std. -C2 with dry sump, heavy magnetos (Swiss engines) have -C2B reduction gear, PS-5 carburetor | -11C |
| GO-435-C2A2 | 260 | 3400 | 80 | 7.30:1 | -C2A have lightweight magnetos | -11C |
| GO-435-C2B | 260 | 3400 | 80 | 7.30:1 | Std. -C2 with propeller governor drive integral with reduction gear | -11BA |
| GO-435-C2B1 | 260 | 3400 | 80 | 7.30:1 | -C2B with angle generator drive | -11BA |
| GO-435-C2B2 | 260 | 3400 | 80 | 7.30:1 | -C2B with lightweight magnetos | -11BA |
| GO-435-C2B26 | 260 | 3400 | 80 | 7.30:1 | -C2B2 with 6th order counterweight | -11BA |
| GO-435-C2E | 260 | 3400 | 80 | 7.30:1 | Fuel grade depends on carburetor setting GO-435-C2 with lightweight magnetos | -11AA |
| VO-435-A1A (O-435-21) |
260 | 3400 | 80 | 7.30:1 | Helicopter; crosswise accessory MA-4-5 carburetor, S6RN-20 and S6RN-21 magnetos (used GSO-480 accessory housing) | -31 |
| VO-435-A1B | 260 | 3400 | 80 | 7.30:1 | Helicopter; redesigned accessory housing (crosswise) S6LN-20, S6LN-21 magnetos, hand starter, no fuel pump or hydraulic pump drive | -31 |
| VO-435-A1C | 260 | 3400 | 80 | 7.30:1 | -A1B with wrap around crankcase, new oil sump fuel and hydraulic pump drive no hand starter AN-I-27 magnetos and harness optional | -31 |
| VO-435-A1D | 260 | 3400 | 80 | 7.30:1 | -A1B with wrap around crankcase and 4 pad oil sump | -31 |
| VO-435-A1E | 260 | 3400 | 80 | 7.30:1 | -AID except for Retard Breaker Magnetos | -31 |
| VO-435-A1F | 260 | 3400 | 80 | 7.30:1 | Similar to -ATE but has piston cooling oil jets and heavy heads, convertible to TVO-435-A1A | -31 |
| VO-435-B1A | 265 | 3200 | 100/100LL | 8.70:1 | High compression wet sump engine with redesigned crosswise accessory section | -31 |
| O-435-23 | 255 | 3400 | 80 | 7.30:1 | -A1B with fuel and hydraulic pump drives, AN-I-27 harness and magnetos, no hand starter (256 to 283 had -20 and -21 magnetos) | -31 |
| O-435-23A | 255 | 3400 | 80 | 7.30:1 | -23 with wrap around crankcase and 4 pad sump | -31 |
| O-435-23B | 255 | 3400 | 80 | 7.30:1 | -23A with altitude compensating carburetor | -31 |
| O-435-23C | 255 | 3400 | 80 | 7.30:1 | Same as -23B except has spring coupling accessory drive | -31 |
| O-435-6 | 255 | 3400 | 80 | 7.30:1 | -A1B with AN-I-27 harness and magnetos, altitude compensating carburetor | -31 |
| O-435-6A | 255 | 3400 | 80 | 7.30:1 | Same as 0-435-6 with wrap around crankcase and 4 pad sump | -31 |
| O-435-25 | 260 | 3200 | 100/100LL | 7.30:1 | Military version of TVO-435-BLA with TVO-435-A1A rating | -52 |
| TVO-435-A1A | 260 | 3200 | 100/100LL | 7.30:1 | 15,000 feet @ 3200 RPM, turbocharged vertical helicopter engine | -52 |
| TVO-435-B1A | 270 | 3200 | 100/100LL | 7.30:1 | 14,000 feet @ 3200 RPM, turbocharged vertical helicopter engine | -52 |
| TVO-435-B1B | 270 | 3200 | 100/100LL | 7.30:1 | Same as -B1A except for -1200 series Magnetos | -52 |
| TVO-435-C1A | 280 | 3200 | 100/100LL | 7.30:1 | 16,000 feet ~ 3200 RPM, turbocharged vertical helicopter engine | -52 |
| TVO-435-D1A | 270 | 3200 | 100/100LL | 7.30:1 | Same as -B1A but has TE0659 Turbocharger and -1200 series magnetos | -52 |
| TVO-435-D1B | 270 | 3200 | 100/100LL | 7.30:1 | Same as -D1A but has -200 series Magnetos | -52 |
| TVO-435-E1A | 260 | 3200 | 100/100LL | 7.30:1 | Similar to -~ but has TE0659 Turbocharger | -52 |
| TVO-435-FlA | 280 | 3200 | 100/100LL | 7.30:1 | Similar to -D1A but has wet sump and higher rating | -52 |
| TVO-435-G1A | 280 | 3200 | 100/100LL | 7.30:1 | Same as -D1A but has 280 HP rating | -52 |
| TVO-435-G1B | 280 | 3200 | 100/100LL | 7.30:1 | Same as -G1A but has -200 series Magnetos | -52 |
| Model | HP | T/O RPM |
Fuel | C.R. | DESCRIPTION | Suffix |
| GO-480-B | 270 | 3400 | 80 | 7.30:1 | High speed straight through generator drive and lightweight magnetos | -28 |
| GO-480-B1A6 | 270 | 3400 | 80 | 7.30:1 | GO-480-B with one sixth order and five third order counterweights | -28 |
| GO-480-B1B | 270 | 3400 | 80 | 7.30:1 | GO-480-B with low speed generator drive and heavy magnetos (GO-435-C2B with 5-1/8 in. bore) | -28 |
| GO-480-B1C | 270 | 3400 | 80 | 7.30:1 | GO-480-B with angle generator drive | -28 |
| GO-480-B1D | 270 | 3400 | 80 | 7.30:1 | GO-480-B1B with lightweight magnetos | -28 |
| GO-480-C1B6 | 295 | 3400 | 100/100LL | 8.70:1 | Dry sump, crosswise accessones (H. C. GO-480-D) | -35 |
| GO-480-C1D6 | 295 | 3400 | 100/100LL | 8.70:1 | High compression GO-480-B1D with 1.75 venturi carburetor | -37 |
| GO-480-C2C6 | 295 | 3400 | 100/100LL | 8.70:1 | High compression GO-480-F6 | -34 |
| GO-480-C2D6 | 295 | 3400 | 100/100LL | 8.70:1 | -C2C6 with lightweight magnetos | -34 |
| GO-480-C2E6 | 295 | 3400 | 100/100LL | 8.70:1 | -C2D6 with angle generator drive (GO-480-B1C accessory housing) | -34 |
| GO-480-D1A | 275 | 3400 | 80 | 7.30:1 | Crosswise accessones, dry sump, lightweight magnetos, PS-5 carburetor with 1.75 venturi fuel pump and hydraulic pump drives | -32 |
| GO-480-F6 | 275 | 3400 | 80 | 7.30:1 | GO~480-B1B with flanged propeller shaft sixth order counterweight 1.75 venturi carburetor | -29 |
| GO-480-F1A6 | 275 | 3400 | 80 | 7.30:1 | -F6 with lightweight magnetos | -29 |
| GO-480-F2A6 | 275 | 3400 | 80 | 7.30:1 | -F1A6 with 20 spline prop. shaft and single oil supply | -29 |
| GO-480-F2D6 | 275 | 3400 | 80 | 7.30:1 | Conversion of -G1D6 to low compression for turbocharging | -29 |
| GO-480-F3A6 | 275 | 3400 | 80 | 7.30:1 | Low compression GO-480-C2D6 (Conversion) | -34 |
| GO-480-F3B6 | 275 | 3400 | 80 | 7.30:1 | Low compression GO-480-C2C6 | -34 |
| GO-480-F4A6 | 275 | 3400 | 80 | 7.30:1 | -F~ with propeller shaft converted to single oil supply for Hartzell propeller with conversion kit P/N 71619 or propeller shaft no. 70414 or no. 70412 Reduction Gear Assembly | -29 |
| GO-480-F4B6 | 275 | 3400 | 80 | 7.30:1 | GO-480-F6 with propeller shaft converted to single oil supply for Hartzell propeller with conversion kit P/N 71619 or propeller shaft no. 70414 or no. 70412 Reduction Gear Assembly | -29 |
| GO-480-G1A6 | 295 | 3400 | 100/100LL | 8.70:1 | High compression GO-480-B1A6 piston cooling oil jets | -42 |
| GO-480-G1B6 | 295 | 3400 | 100/100LL | 8.70:1 | GO-480-C1B6 with piston cooling oil jets | -35 |
| GO-480-G1D6 | 295 | 3400 | 100/100LL | 8.70:1 | -C1D6 with piston cooling oil jets | -37 |
| GO-480-G1H6 | 295 | 3400 | 100/l00LL | 8.70:1 | Same as -G1D6 but with angle generator drive | -34 |
| GO-480-GU6 | 295 | 3400 | 100/100LL | 8.70:1 | Same as -G1A6 but with -1200 series Magnetos | -34 |
| GO-480-G2D6 | 295 | 3400 | 100/100LL | 8.70:1 | GO-480-C2D6 with piston cooling oil jets | -34 |
| GO-480-G2F6 | 295 | 3400 | 1O0/100LL | 8.70:1 | Same as -G2D6 except for Retard Breaker Magnetos | -34 |
| IGO-480-A1A6 | 295 | 3400 | 100/100LL | 8.70:1 | Similar to GO-480-GU6 but has Bendix RSA-5AD1 fuel injector | -56 |
| IGO-480-A1B6 | 295 | 3400 | 100/100LL | 8.70:1 | Similar to GO~80-G1A6 but has Bendix RSA-5AD1 fuel injector | -56 |
| GSO-480-A1A6 | 340 | 3400 | 100/100LL | 7.30:1 | Supercharged, dry sump, crosswise accessories, lightweight magnetos | -33 |
| GSO-480-A1C6 | 340 | 3400 | 100/100LL | 7.30:1 | Same as -A1A6 except for supercharger inlet thermocouple | -33 |
| GSO-480-A2A6 | 340 | 3400 | 100/100LL | 7.30:1 | Conversion of -A1A6 to flanBed reduction gear for reversible propeller | -33 |
| GSO-480-B1A6 | 340 | 3400 | 100/100LL | 7.30:1 | GSO~80-A1A6 with piston cooling oil jets, and updraft carburetor | -33 |
| GSO-480-B1B3 | 340 | 3400 | 100/100LL | 7.30:1 | Same as -B1H6 except Torsional Damper System has been modified | -33 |
| GSO-480-B1B6 | 340 | 3400 | 100/100LL | 7.30:1 | GSO-480-B1A6 with horizontal elbow and carburetor under engine | -33 |
| GSO-480-B1C6 | 340 | 3400 | 100/100LL | 7.30:1 | GSO-480-B1A6 with horizontal carburetor mounted directly on straight thru air inlet supercharger housing | -33 |
| GSO-480-B1E6 | 340 | 3400 | 100/100LL | 7.30:1 | Same as -B1A6 except for Retard Breaker Magnetos | -33 |
| GSO-480-B1F6 | 340 | 3400 | 100/100LL | 7.30:1 | Same as -B1B6 except for Retard Breaker Magnetos | -33 |
| GSO-480-B1G6 | 340 | 3400 | 100/100LL | 7.30:1 | Same as -B1C6 except for Retard Breaker Magnetos | -33 |
| GSO-480-BU6 | 340 | 3400 | 100/100LL | 7.30:1 | Same as -B1A6 but with -1200 series Magnetos | -33 |
| GSO-480-B2C6 | 340 | 3400 | 100/100LL | 7.30:1 | Same as -B1C6 but with flanged reduction gear for reversible propeller | -33 |
| GSO-480-B2D6 | 340 | 3400 | 100/100LL | 7.30:1 | GSO-480-B1A6 with flange propeller shaft and down- draft PSD-78D carburetor | -33 |
| GSO-480-B2G6 | 340 | 3400 | 100/100LLL | 7.30:1 | Same as -B2C6 with Retard Breaker Magnetos | -33 |
| GSO-480-B2H6 | 340 | 3400 | 100/100LL | 7.30:1 | Same as -B2D6 except for Retard Breaker Magnetos | -33 |
| O-480-1**,-1A | 340 | 3400 | 100/100LL | 7.30:1 | Like Beech version of GSO-480-B1B6 (Horizontal carburetor under engine) with -22 and -23 magnetos | -33A |
| IGSO-480-AlA6 | 340 | 3400 | 100/100LL | 7.30:1 | Simmonds Fuel Injection Version of GSO~80-B1B6 | -44 |
| IGSO-480-A1B6 | 340 | 3400 | 100/100LL | 7.30:1 | Same as -A1A6 except for Retard Breaker Magnetos | -44 |
| IGSO-480-A1C6 | 340 | 3400 | 100/100LL | 7.30:1 | Same as -A1A6 except for horizontal air inlet housing and throttle body | -44 |
| IGSO-480-A1D6 | 340 | 3400 | 100/100LL | 7.30:1 | Conversion of GSO-480-B1A6 to Bendix fuel injection | -44 |
| IGSO-480-A1E6 | 340 | 3400 | 100/100LL | 7.30:1 | Same as -A1D6 except for air inlet housing mounts injector 35 deg. forward of vertical and has Retard Breaker Magnetos | -44 |
| IGSO-480-A1F3 | 340 | 3400 | 100/100LL | 730:1 | Same as -A1F6 except Torsional Damper System has been modified | -44 |
| IGSO-480-A1F6 | 340 | 3400 | 100/100LL | 7.30:1 | Same as -A1C6 except for Retard Breaker Magnetos | -44 |
| IGSO-480-A1G6 | 340 | 3400 | 100/100LL | 7.30:1 | Similar to -A1E6 but has -1200 series Magnetos and has fuel flow modulator removed | -44 |
| O-480-3 | 340 | 3400 | 100/~00LL | 7.30:1 | IGSO-480-A1A6 but with -22 and -23 magnetos | -44 |
| Model | HP | T/O RPM |
Fuel | C.R. | DESCRIPTION | Suffix |
| O-540-ALA | 250/ 235 |
2575/ 2400 |
100/100LL | 8.50:1 | Two sixth order counterweights | -40 |
| O-540-A1A5 | 250/ 235 |
2575/ 2400 |
100/100LL | 8.50:1 | Same as O-540-A1A but one fifth and one sixth order counterweights | -40 |
| O-540-A1B5 | 250/ 235 |
2575/ 2400 |
100/100LL | 8.50:1 | Same as -A1A5 except for short propeller governor studs and two impulse magnetos | -40 |
| O-540-A1C5 | 250/ 235 |
2575/ 2400 |
100/100LL | 8.50:1 | Same as -A1A5 except for two impulse magnetos | -40 |
| O-540-A1D | 250/ 235 |
2575/ 2400 |
100/100LL | 8.50:1 | Same as -A1B5 except for two sixth order counterweights with Retard Breaker Magnetos | -40 |
| O-540-A1D5 | 250/ 235 |
2575/ 2400 |
100/100LL | 8.50:1 | Same as -A1B5 except for Retard Breaker Magnetos | -40 |
| O-540-A2B | 250/ 235 |
2575/ 2400 |
100/100LL | 8.50:1 | 0-540-A1A with short propeller governor studs and propeller locating bushing, relocate 60 deg counter clockwise | -40 |
| O-540-A3D5 | 250 | 2575 | 100/100LL | 8.50:1 | Special Navy "Aztec", Same as -A1D5 except for provision for propeller de-icing and chrome barrels, 24 volt system std. | -40 |
| O-540-A4A5 | 250/ 235 |
2575/ 2400 |
100/100LL | 8.50:1 | Same as -A1A5 but with more effective counterweights for use with Hartzell "compact" propeller | -40 |
| O-540-A4B5 | 250/ 235 |
2575/ 2400 |
100/100LL | 8.50:1 | Same as -A1B5 but with more effective counterweights for use with Hartzell "compact" propeller | -40 |
| O-540-A4C5 | 250/ 235 |
2575/ 2400 |
100/100LL | 8.50:1 | Same as -A1C5 but with more effective counterweights for use with Hartzell "compact" propeller | -40 |
| O-540-A4D5 | 250/ 235 |
2575/ 2400 |
100/100LL | 8.50:1 | Same as -A1D5 but with more effective counterweights for use with Hartzell "compact" propeller | -40 |
| O-540-B1A5 | 235 | 2575 | 80 | 7.20:1 | Same as -A1D5 but low C.R. | -40 |
| O-540-B1B5 | 235 | 2575 | 80 | 7.20:1 | Same as -B1A5 but with impulse coupling magnetos and a field conversion of 0-540-A1A5, -A1B5, or -A1C5 to low compression | -40 |
| O-540-B1D5 | 235 | 2575 | 80 | 7.20:1 | -B1A5 with -1200 series Magnetos | -40 |
| O-540-B2A5 | 235 | 2575 | 80 | 7.20:1 | Same as -B1A5 but does not have provision for controllable propeller | -40 |
| O-540-B2B5 | 235 | 2575 | 80 | 7.20:1 | Same as -B2A5 but with impulse coupling magnetos | -40 |
| O-540-B2C5 | 235 | 2575 | 80 | 7.20:1 | Same as -B2B5 but has -1200 series Magnetos | -40 |
| O-540-B4A5 | 235 | 2575 | 80 | 7.20:1 | Same as -B1B5 but with more effective counterweights for use with Hartzell "compact" propeller | -40 |
| O-540-B4B5 | 235 | 2575 | 80 | 7.20:1 | Same as rBlB5 but with more effective counterweights for use with Hartzell "compact" propeller | -40 |
| O-540-D1A5 | 250 | 2575 | 100/100LL | 8.50:1 | Same as -A1D5 but with Bed-type mounts | -40 |
| O-540-E4A5 | 260 | 2700 | 100/i00LL | 8.50:1 | Same as -A4D5 except for higher speed and rating | -40 |
| O-540-E4B5 | 260 | 2700 | 100/100LL | 8.50:1 | Same as -E4A5 but with impulse coupling magnetos with integral feed-thru capacitors | -40 |
| O-540-E4C5 | 260 | 2700 | 100/100LL | 8.50:1 | Same as -E4B5 but has -1200 series Magnetos | -40 |
| O-540-FLA5 | 260 | 2800 | 100/100LL | 8.50:1 | Same as -A~ except for special studs for front end mounting | -40 |
| O-540-F1B5 | 260 | 2800 | 100/100LL | 8.50:1 | Same as -F1A5 except for new style crankcase and Retard Breaker Magnetos | -40 |
| O-540-G1A5 | 260 | 2700 | 100/100LL | 8.50:1 | Similar to -E4C5 except has stiffer crankshaft and -A1D5 counterweights | -40 |
| O-540-G2A5 | 260 | 2700 | 100/100LL | 8.50:1 | Same as -G1A5 but does not have provision for controllable propeller | -40 |
| O-540-H1A5 | 260 | 2700 | 100/100LL | 8.50:1 | Similar to -G1A5 but has piston cooling oil jets and has -21 and -20 magnetos | -40 |
| O-540-H1A5D | 260 | 2700 | 100/100LL | 8.50:1 | Same as -H1A5 but equipped with D6LN-3000 impulse coupling dual magneto system along with the dual magneto accessory housing and related drive system | -40 |
| O-540-H1B5D | 260 | 2700 | 100/100LL | 8.50:1 | Same as -H1A5 but equipped with D6LN-3200 dual magneto system, dual magneto accessory housing, gear train and related drive system | -40 |
| O-540-H2A5 | 260 | 2700 | 100/100LL | 8.50:1 | Same as -H1A5 but with fixed pitch propeller | -40 |
| O-540-H2A5D | 260 | 2700 | 100/100LL | 8.50:1 | Same as -H2A5 but equipped with D6LN-3000 impulse coupling dual magneto system along with the dual magneto accessory housing and related drive system | -40 |
| O-540-H2B5D | 260 | 2700 | 100/100LL | 8.50:1 | Same as -H2A5 but equipped with D6LN-3200 dual magneto system, dual magneto accessory housing, gear train and related drive system | -40 |
| O-540-J1A5D | 235 | 2400 | 100/100LL | 8.50:1 | Similar to -A4A5 except for rating, speed, D6LN-3000 impulse coupling dual magneto and various items of weight reduction | -40 |
| O-540-J1B5D | 235 | 2400 | 100/100LL | 8.50:1 | Same as -J~D but with D6LN-3200 retard breaker dual magnetos | -40 |
| O-540-J1C5D | 235 | 2400 | 100/100LL | 8.50:1 | Same as -J1A5D but with rear mounted HA-6 horizontal carburetor | -40 |
| O-540-DD5D | 235 | 2400 | 100/100LL | 8.50:1 | Same as -J1C5D but with D6LN-3200 retard breaker dual magneto | -40 |
| O-540-J2A5D | 235 | 2400 | 100/100LL | 8.50:1 | Same as -J1A5D but with fixed pitch propeller | -40 |
| O-540-J2B5D | 235 | 2400 | 100/100LL | 8.50:1 | Same as -J1B5D but with fixed pitch propeller | -40 |
| O-540-J2C5D | 235 | 2400 | 100/100LL | 8.50:1 | Same as -J1C5D but with fixed pitch propeller | -40 |
| O-540-J2D5D | 235 | 2400 | 100/100LL | 8.50:1 | Same as -J11)5D but with fixed pitch propeller | -40 |
| O-540-J3A5 | 235 | 2400 | 100/100LL | 8.50:1 | Same as -J~D but has Slick 6251 (impulse coupling) and 6250 magnetos | -40 |
| O-540-J3A5D | 235 | 2400 | 100/100LL | 8.50:1 | Same as -J1A5D but has heavier counterweights for use with Hartzell extended hub controllable propeller | -40 |
| O-540-J3C5D | 235 | 2400 | 100/100LL | 8.50:1 | Same as -J1C5D but has heavier counterweights for use with McCauley controllable propeller | -40 |
| O-540-L3C5D | 235 | 2400 | 100/100LL | 8.50:1 | Similar to -J3C5D except for long reach spark plugs, high pressure fuel pump, piston cooling oil jet and turbocharger scavenge pump | -40 |
| IO-540-A1A5 | 290 | 2575 | 100/100LL | 8.70:1 | High compression tuned induction, Retard Breaker Magnetos, Bendix fuel injector | -48 |
| IO-540-B1A5 | 290 | 2575 | 100/100LL | 8.70:1 | Same as -A1A5 except for updraft exhaust cooling | -48 |
| IO-540-B1B5 | 290 | 2575 | 100/100LL | 8.70:1 | Same as -B1A5 except for Sunmonds fuel injector | -48 |
| IO-540-B1C5 | 290 | 2575 | 100/100LL | 8.70:1 | Same as -B1A5 except it has external servo bleed in fuel injection system | -48 |
| IO-540-C1B5 | 250 | 2575 | 100/100LL | 8.50:1 | Same as O-540-A1D5 but with Bendix fuel injector | -48 |
| IO-540-C1C5 | 250 | 2575 | 100/100LL | 8.50:1 | Same as -C1B5 but has AN fuel pump drive | -48 |
| IO-540-C2C | 250 | 2575 | 100/100LL | 8.50:1 | Conversion of O-540-A2B to Bendix fuel injection and AN fuel pump drive | -48 |
| IO-540-C4B5 | 250 | 2575 | 100/100LL | 8.50:1 | Same as -C1B5 but with more effective counterweights for use with Hartzell "compact,, propeller | -48 |
| IO-540-C4C5 | 250 | 2575 | 100/100LL | 8.50:1 | Same as -C4B5 but has AN fuel pump drive | -48 |
| IO-540-C4D5 | 250 | 2575 | 100/100LL | 8.50:1 | Same as -C4D5D except has two magnetos | -48 |
| IO-540-C4D5D | 250 | 2575 | 100/100LL | 8.50:1 | Same as -C4B5 but with D6LN-3000 impulse coupling magneto | -48 |
| IO-540-D4A5 | 260 | 2700 | 100/100LL | 8.50:1 | Same as O-540-E4A5 but with Bendix fuel injection | -48 |
| IO-540-D4B5 | 260 | 2700 | 100/100LL | 8.50:1 | Same as -D4A5 but has -1200 series impulse coupling magnetos | -48 |
| IO-540-D4C5 | 260 | 2700 | 100/100LL | 8.50:1 | Same as -D4B5 but with Retard Breaker Magnetos | -48 |
| IO-540-E1A5 | 290 | 2575 | 100/100LL | 8.70:1 | Same as -B1C5 but with piston cooling oil jets | -48 |
| IO-540-E1B5 | 290 | 2575 | 100/100LL | 8.70:1 | Same as -E1A5 but with -1200 series Magnetos | -48 |
| IO-540-E1C5 | 290 | 2575 | 100/100LL | 8.70:1 | Same as -E1B5 with RSA-10ED1 fuel injector | -48 |
| IO-540-G1A5 | 290 | 2575 | 100/100LL | 8.70:1 | Same as -A1A5 but with piston cooling oil jets | -48 |
| IO-540-G1B5 | 290 | 2575 | 100/100LL | 8.70:1 | Similar to -G1A5 but has -1200 series Magnetos and RSA-10ED1 fuel injector | -48 |
| IO-540-G1C5 | 290 | 2575 | 100/100LL | 8.70:1 | Same as -G1B5 but has impulse magnetos and 38-1/2" injector adapter | -48 |
| IO-540-G1D5 | 290 | 2575 | 100/100LL | 8.70:1 | Same as -G1C5 but has straight injeecor inlet | -48 |
| IO-540-G1E5 | 290 | 2575 | 100/100LL | 8.70:1 | Same as -G1A5 but has -1200 series Magnetos | -48 |
| IO-540-G1F5 | 290 | 2575 | 100/100LL | 8.70:1 | Same as -G1E5 but with (2) impulse coupling Magnetos | -48 |
| IO-540-J4A5 | 250 | 2575 | 100/100LL | 8.50:1 | Same as -C4B5 except comersion for use with turbo- charger, long reach spark plugs, piston cooling oil jets, AN fuel pump drive, vented fuel nozzles and -1200 series Magnetos | -48 |
| IO-540-K1A5 | 300 | 2700 | 100/100LL | 8.70:1 | Similar to -G1A5 but has -1200 series Magnetos, RSA-10ED1 injector, large crankshaft and 38-1/2_ fuel injector adapter | -48 |
| IO-540-K1A5D | 300 | 2700 | 100/100LL | 8.70:1 | Same as -K1A5 but with D6LN-3000 impulse coupling dual magneto | -48 |
| IO-540-K1B5 | 300 | 2700 | 100/100LL | 8.70:1 | Similar to -KIA5 but has two impulse coupling magnetos and straight injector adapter | -48 |
| IO-540-K1BSD | 300 | 2700 | 100/100LL | 8.70:1 | Same as -K1B5 but with D6LN-3000 impulse coupling dual magneto | -48 |
| IO-540-K1C5 | 300/ 290 |
2700/ 2575 |
100/100LL | 8.70:1 | Similar to -G1A5 but has -K1A5 rotating system | -48 |
| IO-540-K1D5 | 300 | 2700 | 100/100LL | 8.70:1 | Same as -K1A5 but has -200 series Magnetos, flange fuel injector and straight injector inlet | -48 |
| IO-540-K1E5 | 300 | 2700 | 100/100LL | 8.70:1 | Similar to -K1C5 but has -1200 series impulse Magnetos | -48 |
| IO-540-K1E5D | 300 | 2700 | 100/100LL | 8.70:1 | Same as -K1E5 but with D6LN-3000 impulse coupling dual magneto | -48 |
| IO-540-K1F5 | 300/ 290 |
2700/ 2575 |
100/100LL | 8.70:1 | Same as -G1B5 but with IO-540-K series rotating system | -48 |
| IO-540-K1F5D | 300 | 2700 | 100/100LL | 8.70:1 | Same as -K1F5 but with D6LN-3200 retard breaker dual magneto | -48 |
| IO-540-K1G5 | 300 | 2700 | 100/100LL | 8.70:1 | Same as -K1A5 but has diaphragm type fuel pump and drive | -48 |
| IO-540-K1G5D | 300 | 2700 | 100/100LL | 8.70:1 | Same as -K1A5D but has diaphragm type fuel pump and drive | -48 |
| IO-540-K1H5 | 300 | 2700 | 100/100LL | 8.70:1 | Same as -K1B5 but has diaphragm type fuel pump and drive | -48 |
| IO-540-KU5 | 300 | 2700 | 100/100LL | 8.70:1 | Same as -K1F5 but has diaphragm type fuel pump and drive | -48 |
| IO-540-KU5D | 300 | 2700 | 1O0/100LL | 8.70:1 | Same as -K1F5D but has diaphragm type fuel pump and drive | -48 |
| IO-540-K1K5 | 300 | 2700 | 100/100LL | 8.70:1 | Similar to -K1A5 except modified for use with an Aerobatic kit | -48 |
| IO-540-K2A5 | 300 | 2700 | 100/100LL | 8.70:1 | Same as -K1A5 except has different propeller bushings | -48 |
| IO-540-L1A5 | 300 | 2700 | 100/100LL | 8.70:1 | Similar to -K1A5 but with front air inlet and Retard Magnetos | -48 |
| IO-540-L1A5D | 300 | 2700 | 100/100LL | 8.70:1 | Same as -L1A5 but with D6LN-3000 impulse coupling dual magneto | -48 |
| IO-540-L1B5D | 300 | 2700 | 100/100LL | 8.70:1 | Similar to -L1A5D except for a modified oil sump | -48 |
| IO-540-L1C5 | 300 | 2700 | 100/100LL | 8.70:1 | Same as -L1A5 but has diaphragm type fuel pump and drive | -48 |
| IO-540-M1A5 | 300 | 2700 | 100/100LL | 8.70:1 | Similar to -K1A5 but has Retard Magnetos and up exhaust heads | -48 |
| IO-540-M1A5D | 300 | 2700 | 100/100LL | 8.70:1 | Same as -M1A5 but with D6LN-3200 Retard Breaker dual magneto | -48 |
| IO-540-M1B5D | 300 | 2700 | 100/100LL | 8.70:1 | Similar to -M1A5D but with RSA-10ED1 fuel injector, automotive type fuel pump, D6LN-3000 impulse coupling magneto and straight fuel injection adapter | -48 |
| IO-540-M1C5 | 300 | 2700 | 100/100LL | 8.70:1 | Same as -M1A5 except has impulse magneto | -48 |
| IO-540-M2A5D | 300 | 2700 | 100/100LL | 8.70:1 | Similar to -M1A5 but has D6LN-3200 Retard Breaker dual magneto and provision for fixed pitch propeller | -48 |
| IO-540-N1A5 | 260 | 2700 | 100/100LL | 8.50:1 | Similar to -D4A5 but with O-540-G1A5 crankcase and crankshaft and -K1A5 counterweight assembly | -48 |
| IO-540-P1A5 | 290 | 2575 | 100/100LL | 8.70:1 | Same as -G1B5 but has larger oil pump and is s usable for turbocharging | -48 |
| IO-540-R1A5 | 260 | 2700 | 100/100LL | 8.50:1 | Similar to -N1A5 except converted for use with turbocharger long reach spark plugs. Piston cooling oil jets, AN fuel pump, vented fuel nozzles and -1200 series magnetos | -48 |
| IO-540-S1A5 | 300/ 290 |
2700/ 2575 |
100/100LL | 8.70:1 | Same as -P1A5 but with IO-540-K series rotating system | -48 |
| IO-540-T4A5D | 260 | 2700 | 100/100LL | 8.50:1 | Similar to -D4B5 but has D6LN-3000 impulse coupling dual magneto and horizontal rear inlet fuel injector | -48 |
| IO-540-T4B5 | 260 | 2700 | 100/100LL | 8.70:1 | Same as -T4B5D except has two Slick Magnetos | -48 |
| IO-540-T4B5D | 260 | 2700 | 100/100LL | 8.50:1 | Identical to -T4A5D except for fuel drain boss location | -48 |
| IO-540-T4C5D | 260 | 2700 | 100/100LL | 8.50:1 | Same as -T4B5D but has Bendix D6LN-3200 retard breaker magneto | -48 |
| IO-540-U1A5D | 300 | 2700 | 100/100LL | 8.70:1 | Same as -L1A5 but with up-exhaust cylinder heads and D6LN-3000 impulse coupling dual magneto | -48 |
| IO-540-U1B5D | 300 | 2700 | 100/100LL | 8.70:1 | Same as -U1A5D but has diaphragm type fuel pump and drive | -48 |
| IO-540-V4A5D | 260 | 2700 | 100/100LL | 8.50:1 | Same as -T4B5D except for front mounted fuel injector | -48 |
| IO-540-W1A5 | 235 | 2700 | 100/100LL | 8.70:1 | Same as -W1A5D except has two Slick Magnetos | -48 |
| IO-540-W1A5D | 235 | 2400 | 100/100LL | 8.50:1 | Similar to O-540-J1A5D except that it is equipped with IO-540-V4A5D sump, intake pipes and fuel injection system | -48 |
| IO-540-W3A5D | 235 | 2400 | 100/100LL | 8.50:1 | Same as -W1A5D but has heavier counterweights for use with Hartzell propeller | -48 |
| IO-540-AA1A5 | 250 | 2425 | 100/100LL | 7.30:1 | Similar to -S1A5 except for compression ratio | -48 |
| IO-540-AA1B5 | 270 | 2700 | 100/100LL | 7.30:1 | Same as -AA1A5 except has impulse magneto and higher rating | -48 |
| VO-540-A1A | 305 | 3300 | 80 | 7.30:1 | Low compression vertical PS-7BD carburetor | -43 |
| VO-540-A2A | 305 | 3300 | 80 | 7.30:1 | Same as -A1A but with spring coupling accessory drive | -43 |
| VO-540-B1A | 305 | 3200 | 80 | 7.30:1 | Same as -A1A except MA-6-AA carburetor | -43 |
| VO-540-B1B | 305 | 3200 | 80 | 7.30:1 | Same as -B1A except for Retard Breaker Magnetos and less fuel pump drive and hydraulic pump drive | -43 |
| VO-540-B1B3 | 305 | 3200 | 80 | 7.30:1 | Same as -BIB except for six 3rd order counterweights | -43 |
| VO-540-B1C | 305 | 3200 | 80 | 7.30:1 | Same as -B1A except for Retard Breaker Magnetos | -43 |
| VO-540-B1D | 305 | 3200 | 80 | 7.30:1 | Same as -B1C except for two MA-6-AA carburetors | -43 |
| VO-540-B1E | 305 | 3200 | 80 | 7.30:1 | Retrofit kit of -B1A with two MA-6-AA carburetors | -43 |
| VO-540-B1F | 305 | 3200 | 80 | 7.30:1 | Same as -BIB but has fuel and hydraulic pump drives | -43 |
| VO-540-B1H3 | 305 | 3200 | 80 | 7.30:1 | Same as -B1B3 but with -1200 series Magnetos | -43 |
| VO-540-B2A | 305 | 3200 | 80 | 7.30:1 | Same as -B1A but with spring coupling accessory drive | -43 |
| VO-540-B2C | 305 | 3200 | 80 | 7.30:1 | Same as -B1C but with spr~ng coupling accessory drive | -43 |
| VO-540-B2D | 305 | 3200 | 80 | 7.30:1 | Same as -BID but with sprmg coupling accessory drive | -43 |
| VO-540-B2E | 305 | 3200 | 80 | 7.30:1 | Same as -B1E but with spring coupling accessory drive | -43 |
| VO-540-B2G | 305 | 3200 | 80 | 7.30:1 | Same as -B2D but with -1200 series Magnetos | -43 |
| VO-540-C1A | 315 | 3200 | 100/100LL | 8.70:1 | High compression altitude engine with two (2) MA-6-AA carburetors, retard breaker magnetos. Same as -B1D except for compression ratio and power | -43 |
| VO-540-C1B | 315 | 3200 | 100/100LL | 8.70:1 | Retrofit kit of -B1E with high compression piston and higher power | -43 |
| VO-540-C1C3 | 305 | 3200 | 100/100LL | 8.70:1 | Same as -B1B3 except it has high compression pistons and two MA-6-AA carburetors | -43 |
| VO-540-C2A | 315 | 3200 | 100/100LL | 8.70:1 | Same as -CIA but with spring coupling accessory drive | -43 |
| VO-540-C2B | 315 | 3200 | 100/100LL | 8.70:1 | Same as -C1B but with spring coupling accessory drive | -43 |
| VO-540-C2C | 315 | 3200 | 100/100LL | 8.70:1 | Same as -C2A except for -1200 series magnetos | -43 |
| O-540-9,-9A | 305 | 3200 | 100/100LL | 8.70:1 | Military version of VO-540-C2A | -43 |
| HIO-540-A1A | 290 | 2575 | 100/100LL | 8.70:1 | Similar to IO-540-K1A5 but has lower rating and speed, no provision for propeller governor and has front mounting pads machined and studded | -48 |
| IGO-540-A1A | 350 | 3400 | 100/100LL | 8.70:1 | High compression tuned induction, Retard Breaker Magnetos, Bendix fuel injector | -49 |
| IGO-540-A1B | 350 | 3400 | 100/100LL | 8.70:1 | Same as -A1A except for low tension ignition system | -49 |
| IGO-540-A1C | 350 | 3400 | 100/100LL | 8.70:1 | Similar to -A1A but equipped with RSA-10DB1 fuel injector, RG-9080-J7 fuel pump, S6RN-1208 and -1209 magnetos and a Prestolite 24V-100A AN drive alternator | -49 |
| IGO-540-B1A | 350 | 3400 | 100/100LL | 8.70:1 | Same as -A1A except for updraft exhaust cooling | -49 |
| IGO-540-B1B | 350 | 3400 | 100/100LL | 8.70:1 | Same as -B1A except for low tension ignition system | -49 |
| IGO-540-B1C | 350 | 3400 | 100/100LL | 8.70:1 | Same as -BM except it has extemal sewo bleed in fuel injection system | -49 |
| IVO-540-A1A | 305 | 3200 | 100/100LL | 8.70:1 | Similar to VO-540-C1A but has Bendix RS10-AD1 fuel injector | -60 |
| TIO-540-A1A | 310 | 2575 | 100/100LL | 7.30:1 | Similar to IO-540-ELA5 but has turbocharger (TE0659) RSA-10-AD1 fuel injector and -1200 series Magnetos | -61 |
| TIO-540-A1B | 310 | 2575 | 100/100LL | 7.30:1 | Same as -A1A but has density controller with faster temperature response | -61 |
| TIO-540-A1C | 310 | 2575 | 100/100LL | 7.30:1 | Similar to -A1B but has revised controller setting | -61 |
| TIO-540-C1A | 250 | 2575 | 100/100LL | 7.20:1 | IO-540-J4A5 equipped with TE0659 turbocharger and low compression pistons | -61 |
| TIO-540-E1A | 260 | 2575 | 100/100LL | 7.20:1 | Same as -CIA but has higher rating and impulse coupling magneto | -61 |
| TIO-540-G1A | 250 | 2575 | 100/100LL | 8.50:1 | Same as -CIA but high compression | -61 |
| TIO-540-H1A | 270 | 2575 | 100/100LL | 7.20:1 | Same as -ETA except for horsepower setting | -61 |
| TIO-540-K1AD | 250 | 2575 | 100/100LL | 8.00:1 | Similar to -CIA but with D6LN-3200 retard breaker dual magneto, pressure controller, provision for cabin pressurization, rear mounted fuel injector, turbocharger mounted to rear of engine and higher C.R. | -61 |
| TIO-540-S1AD | 300 | 2700 | 100/100LL | 7.30:1 | Similar to IO-540-M2AD with front air inlet, provision for controllable propeller, a manually controlled TE0659 turbocharger and D6LN-3000 impulse coupling magneto | -61 |
| TIO-540-AA1AD | 270 | 2575 | 100/100LL | 8.00:1 | Similar to -K1AD but has a different controller system and has provision for a rear mounted propeller governor | -61 |
| TIO-540-AB1AD | 250 | 2575 | 100/100LL | 8.00:1 | Same as -AA1AD but has bottom mounted fuel injector, a relocated turbocharger and a D6LN-3000 impulse coupling magneto | -61 |
| TIO-540-AB1BD | 250 | 2575 | 100/100LL | 8.00:1 | Similar to -AB1AD except has propeller governor mounted on the accessory housing and the turbo scavenger pump moved to the vacuum pump pad and more effective counterweights for McCauley propeller | -61 |
| TIO-540-AF1A | 270 | 2575 | 100/100LL | 8.00:1 | Similar to -AA1AD but has Slick magnetos, different turbocharger and an intercooler | -61 |
| TIO-540-A2A | 310 | 2575 | 100/100LL | 7.30:1 | Same as -A1A but with propeller flange bushings for 3-blade propeller | -61 |
| TIO-540-A2B | 310 | 2575 | 100/100LL | 7.30:1 | Same as -A1B but with propeller flange bushings for 3-blade propeller | -61 |
| TIO-540-A2C | 310 | 2575 | 100/100LL | 7.30:1 | Same as -A1C but with propeller flange bushings for 3-blade propeller | -61 |
| TIO-540-F2BD | 325 | 2575 | 100/100LL | 7.30:1 | Similar to -A2B but incorporates D6LN-3200 retard breaker dual magneto system | -61 |
| TIO-540-J2B | 350 | 2575 | 100/100LL | 7.30:1 | Same as -J2BD but has S6LN-1208 (Retard Breaker) and S6LN-1209 magnetos | -61 |
| TIO-540-J2BD | 350 | 2575 | 100/100LL | 7.30:1 | Similar to -F2BD except equipped with TH08A60 turbocharger | -61 |
| TIO-540-N2BD | 350 | 2575 | 100/100LL | 7.30:1 | Identical to -J2BD except turbocharger shifted one-half inch to the left | -61 |
| TIO-540-R2AD | 350/ 340 |
2575/ 2500 |
100/100LL | 7.30:1 | Similar to -J2BD except has provision for cabin bleed and has a variable pressure controller | -61 |
| TIO-540-T2AD | 330 | 2400 | 100/100LL | 7.30:1 | Same as -J2BD except for a modified exhaust transition and lower rating | -61 |
| TIO-540-U2A | 350 | 2500 | 100/100LL | 7.30:1 | Similar to IO-~0-~5 but with intercooler and customer supplied turbocharger system | -61 |
| TIO-540-V2AD | 360 | 2600 | 100/100LL | 7.30:1 | Similar to -J2BD except with an intercooler and a change in cylinder head design | -61 |
| TIO-540-W2A | 360 | 2600 | 100/100LL | 7.30:1 | Similar to -V2AD but with Slick 6261 (imp. coupling) and 6260 pressurized magnetos, a different controller system and without either induction air cooler or cabin bleed | -61 |
| TIO-540-AE2A | 350 | 2500 | 100/100LL | 7.30:1 | Similar to -U2A but has (2) Garrett instead of Roto-Master turbochargers, (2) intercoolers, (1) wastegate and Slick magnetos | -61 |
| AEIO-540-D4A5 | 260 | 2700 | 100/100LL | 8.50:1 | Same as IO-540-D4A5 but is equipped with Aerobatic kit | -48 |
| AEIO-540-D4B5 | 260 | 2700 | 100/100LL | 8.50:1 | Same as IO-540-D4B5 but is equipped with Aerobatic kit | -48 |
| AEIO-540-D4C5 | 260 | 2700 | 100/100LL | 8.50:1 | Same as IO-540-D4C5 but is equipped with Aerobatic kit | -48 |
| AEIO-540-L1B5 | 300 | 2700 | 100/100LL | 8.70:1 | Same as -L1B5D but has Slick 6251 (impulse coupling) and 6250 magnetos | -48 |
| AEIO-540-L1B5D | 300 | 2700 | 100/100LL | 8.70:1 | Same as IO-540-L1B5D but is equipped with Aerobatic kit | -48 |
| IGSO-540-ALA | 380 | 3400 | 100/100LL | 7.30:1 | Supercharged Bendix fuel injector, dry sump, cross-wise accessones high altitude magnetos | -50 |
| IGSO-540-A1C | 380 | 3400 | 100/100LL | 7.30:1 | Same as -AL: but with honzontal air inlet housing and has external servo bleed in fuel injection system | -50 |
| IGSO-540-A1D | 380 | 3400 | 100/100LL | 7.30:1 | Same as -A1A but has -1200 series Magnetos | -50 |
| IGSO-540-A1E | 380 | 3400 | 100/100LL | 7.30:1 | Same as -A1C but has -1200 series Magnetos and no vent flow restriction | -50 |
| IGSO-540-A1F | 380 | 3400 | 100/100LL | 7.30:1 | Same as -AID but with fuel flow modulator removed | -50 |
| IGSO-540-A1H | 380 | 3400 | 100/100LL | 7.30:1 | Same as -ATE but with fuel flow modulator removed | -50 |
| IGSO-540-BLA | 380 | 3400 | 100/100LL | 7.30:1 | Same as -ALA except for updraft exhaust cooling and Simmonds fuel injector | -50 |
| IGSO-540-B1C | 380 | 3400 | 100/100LL | 7.30:1 | Same as -B1A but has -1200 series Magnetos | -50 |
| LTIO-540-K1AD | 250 | 2575 | 100/100LL | 8.00:1 | Similar to TIO-540-K1AD but has left hand rotation crankshaft | -68 |
| LTIO-540-F2BD | 325 | 2575 | 100/100LL | 7.30:1 | Same as TIO-540-F2BD but has reverse rotation | -68 |
| LTIO-540-J2B | 350 | 2575 | 100/100LL | 7.30:1 | Same as -J2BD but have S6RN-1208 (Retard Breaker) and S6RN-12O9 magnetos | -68 |
| LTIO-540-J2BD | 350 | 2575 | 100/100LL | 7.30:1 | Same as TIO-540-J2BD but has reverse rotation | -68 |
| LTIO-540-N2BD | 350 | 2575 | 100/100LL | 7.30:1 | Similar to TIO-540-N2BD but has left hand rotation crankshaft | -68 |
| LTIO-540-R2AD | 350/ 340 |
2575/ 2500 |
100/100LL | 7.30:1 | Similar to TIO-540-R2AD but has left hand rotation crankshaft | -68 |
| LTIO-540-U2A | 350 | 2500 | 100/100LL | 7.30:1 | Same as TIO-540-U2A but has reverse rotation | -68 |
| LTIO-540-V2AD | 360 | 2600 | 100/100LL | 7.30:1 | Same as TIO-540-V2AD but has reverse rotation | -68 |
| LTIO-540-W2A | 360 | 2600 | 100/100LL | 7.30:1 | Same as TIO-540-W2A but has left hand rotation crankshaft | -68 |
| TIVO-540-A2A | 315 | 3200 | 100/100LL | 7.30:1 | 14,000 feet at 3200 RPM, turbocharger Bendix fuel injection vertical helicopter engine with spring coupling accessory drive | -57 |
| Model | HP | T/O RPM |
Fuel | C.R. | DESCRIPTION | Suffix |
| TIO-541-A1A | 310 | 2575 | 100/100LL | 7.30:1 | Turbocharger (T-1823), fuel injected (RSA-10-ADV, crosswise accessories, integral accessory section, wet sump | -59 |
| TIO-541-E | 380 | 2900 | 100/100LL | 730:1 | Similar to -A1A but has compressor drive, larger redesigned cylinder head, RSA-10DB1 injector and higher rating | -59 |
| TIO-541-E1B4 | 380 | 2900 | 100/100LL | 7.30:1 | Same as -E~4 but has no provision for cabin pressurization | -59 |
| TIO-541-E1C4 | 380 | 2900 | 100/100LL | 7.30:1 | Same as -E1A4 but has 1~1879 turbocharger | -59 |
| TIO-541-E1D4 | 380 | 2900 | 100/100LL | 7.30:1 | Same as -E1B4 but has 1~1879 turbocharger | -59 |
| TIGO-541-D1A | 450 | 3200 | 100/100LL | 7.30:1 | Turbocharged (T18A21), fuel injected (RSA-l0-DBl), offset reduction gear, torquemeter, crosswise accessories, integral accessory section, wet sump | -62 |
| TIGO-541-D1B | 450 | 3200 | 100/100LL | 7.30:1 | Similar to -D1A but with integral wastegate turbocharger and low drag cylinder heads | -62 |
| TIGO-541-E1A | 425 | 3200 | 100/100LL | 7.30:1 | Same as -D1A except for rating | -62 |
| TIGO-541-GLAD | 450 | 3200 | 100/100LL | 7.30:1 | Similar to -D1A but has D6RN-3200 retard breaker dual magneto and intercooler and fuel head enrichment fuel injector | -62 |
| Model | HP | T/O RPM |
Fuel | C.R. | DESCRIPTION | Suffix |
|---|---|---|---|---|---|---|
| IO-720-A1A | 400 | 2650 | 100/100LL | 8.70:1 | High compression tuned induction, Bendix fuel injector and AN fuel pump drive | -54 |
| IO-720-A1B | 400 | 2650 | 100/100LL | 8.70:1 | Same as -A~ but equipped with S8LN-1208 and -1209 Magnetos | -54 |
| IO-720-A1BD | 400 | 2650 | 100/100LL | 8.70:1 | Same as -A1B but with D8LN-3200 Retard Breaker dual magneto | -54 |
| IO-720-B1A | 400 | 2650 | 100/100LL | 8.70:1 | Same as -AIA but with updraft exhaust cooling and rear air inlet | -54 |
| IO-720-B1B | 400 | 2650 | 100/100LL | 8.70:1 | Same as -B1A but equipped with S8LN-1208 and -1209 Magnetos | -54 |
| IO-720-B1BD | 400 | 2650 | 100/100LL | 8.70:1 | Same as -B1B but with D8LN-3200 Retard Breaker dual Magneto | -54 |
| IO-720-C1B | 400 | 2650 | 100/100LL | 8.70:1 | Same as -B1B but has up-exhaust cylinder heads | -54 |
| IO-720-C1BD | 400 | 2650 | 100/100LL | 8.70:1 | Same as -C1B but with D8LN-3200 Retard Breaker dual Magneto | -54 |
| IO-720-D1B | 400/ 375 |
2650/ 2500 |
100/100LL | 8.70:1 | Similar to -A1B but has rear air inlet | -54 |
| IO-720-D1BD | 400/ 375 |
2650/ 2500 |
100/100LL | 8.70:1 | Same as -D1B but with D8LN-3200 Retard Breaker dual Magneto | -54 |
| IO-720-D1C | 400/ 375 |
2650/ 2500 |
100/100LL | 8.70:1 | Same as -D1B but has 38-1/2_ fuel injector adapter | -54 |
| IO-720-D1CD | 400/ 375 |
2650/ 2500 |
100/100LL | 8.70:1 | Same as -D1C but with D8LN-3200 Retard Breaker dual 2500 magnetos | -54 |