| O-435 | |
|---|---|
| A Lycoming TVO-435 from a Bell 47G | |
| Type | Piston aircraft engine |
| Manufacturer | Lycoming Engines |
| First run | c.1942 |
| Major applications | Bell 47 |
| Developed from | Lycoming O-290 |
The Lycoming O-435 is a six-cylinder, horizontally opposed fixed-wing aircraft and helicopter engine made by Lycoming Engines. The engine is a six-cylinder version of the four-cylinder Lycoming O-290.
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The powerplant is a horizontally opposed Lycoming 6-cylinder design. It is direct-drive, air-cooled, and normally aspirated. The cylinders have steel barrels with aluminum heads, and the valves are operated by hydraulic lifters. The crankshaft is supported in an aluminum-alloy split case by four main bearings and one ball-thrust bearing, and lubricating oil is supplied from a 12 quart wet sump. The camshaft rides in journals that do not employ bearing inserts. The accessory housing supports two magnetos, a starter, a generator, and a dual tach drive. A spare mounting pad is included for a vacuum pump.
Lycoming O-435-11
Displacement 435 cubic inches
Compression Ratio 6.5 : 1
Maximum Rated Power (takeoff) 190 hp at 2550 rpm (O-435-1)
195hp at 2550 rpm (O-435-11)
215hp at 2850 rpm (O-435-11)
Normal Operating Range 1900 - 2350 rpm
Induction Marvel-Schebler MA-4-5 carburetor
Fuel 73 or 80/85 octane
Engine Weight 350 to 379 lbs
Power Loading 14.33 lb / hp
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