History
The Lycoming O-435 is an American six-cylinder, horizontally opposed, internal combustion aircraft engine. Used on both fixed-wing airplanes and helicopters, the engine is a six-cylinder version of the four-cylinder Lycoming O-290.
Design and development
The powerplant is a horizontally opposed Lycoming six-cylinder, gasoline-fueled internal combustion design. It is a direct-drive or geared, air-cooled, and naturally aspirated engine. 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