Continental O-300

The Continental O-300 and the C145 are a family of air-cooled flat-6 aircraft piston engines built by Teledyne Continental Motors.

First produced in 1947, versions were still in production. It was produced under licence in the United Kingdom by Rolls-Royce in the 1960s.

Development
The C-145 was developed from the 125 hp C-125 engine. Both powerplants share the same crankcase, although the C-145 produces an additional 20 hp through a longer piston stroke, higher compression ratio of 7.0:1 and different carburetor jetting.

The O-300 is a modernized C-145 and retains the same weight, dimensions, bore, stroke, compression ratio, displacement and output power of the earlier engine.

GO-300
The GO-300 employs a reduction gearbox, so that the engine turns at 3200 rpm to produce a propeller rpm of 2400. The GO-300 produces 175 hp whereas the ungeared O-300 produces 145 hp.

The GO-300 engine has a TBO (Time Between Overhaul) of 1200 hours, while 1800 hours is the standard for ungeared O-300 engines. The GO-300 engine suffered reliability problems as a result of pilots mishandling the engine and operating it at too low an engine rpm. This caused the Cessna Skylark to develop a poor reputation for engine reliability. Many Skylarks flying today have been converted to different, larger-displacement, direct-drive engines.

Variants

 * C145
 * Six-cylinder, 145 hp, direct-drive engine.


 * C145-2:
 * O-300
 * Modernized C145, 145 hp, direct drive engine.


 * O-300-A
 * O-300-B
 * O-300-C
 * O-300-D
 * O-300-E
 * Limited production for the Beagle B.218X twin that never went into production
 * O-300-D
 * O-300-E
 * Limited production for the Beagle B.218X twin that never went into production
 * Limited production for the Beagle B.218X twin that never went into production


 * GO-300
 * Geared O-300, 175 hp at 3200 crankshaft rpm, 2400 propeller rpm.


 * GO-300-A
 * GO-300-C
 * GO-300-D
 * Voyager 300
 * Liquid-cooled, fuel-injected version developing 170 hp at 2,700 rpm.
 * Voyager 300
 * Liquid-cooled, fuel-injected version developing 170 hp at 2,700 rpm.
 * Liquid-cooled, fuel-injected version developing 170 hp at 2,700 rpm.


 * Rolls-Royce-Continental O-300:Licence production in the United Kingdom.

O-300

 * Aeronca Sedan
 * Baumann Brigadier
 * Cessna 160 - intended for production model
 * Cessna 170
 * Cessna 172 and T-41 Mescalero
 * Maule M-4
 * Meyers MAC-145
 * Taylorcraft 15
 * Temco TE-1A

GO-300

 * Cessna 175
 * Goodyear GZ-19 and GZ-19A

Voyager 300

 * Alexeev Strizh

Specifications (O-300)
Reference: Engines for Homebuilt Aircraft & Ultralights