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The O-435 is a horizontally opposed Lycoming six-cylinder design developed from the four-cylinder Lycoming O-290. It is a direct-drive or geared, air-cooled, and normally 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.

Specifications: (O-435-D)

General characteristics
  Type: Six-cylinder horizontally-opposed gasoline piston engine
  Bore: 4.875 in (123.7 mm)
  Stroke: 3.875 in (98.4 mm)
  Displacement: 434 cu in (7.1 L)
  Width: 33.5 in (824 cm)
  Height: 43.5 in (1,105 cm)
  Dry weight: 433 lb (196.6 kg)

Components
  Valvetrain: Overhead valve, one inlet and one exhaust valve per cylinder
  Fuel system: Marvel-Schebler carburetor
  Fuel type: 100 octane gasoline
  Oil system: Pressure pump type
  Cooling system: Air-cooled by fan
  Reduction gear: Direct-drive

Performance
  Power output: 212 hp (158 Kw)at 3,000 rpm at sea level
  Compression ratio: 7.5:1

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Applications:
– Stinson L-5 Sentinel

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[Source - Wikipedia]

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