Continental Aircraft Engines - The Continental O-300 and C145 are a family of air-cooled inline six engines manufactured by Continental Motors.
Production began in 1947 and some versions continued to be produced until 2004. It was produced under license in the UK by Rolls-Royce in the 1960s.
Continental Aircraft Engines
The C145 was a development of the C125 engine with an output of 125 hp (93 kW). Both engines use the same crankshaft, but the C145 increases power by 15 kW (20 hp) with a longer piston stroke, a higher 7.0:1 compression ratio and a different carburetor.
Continental O 470 13a > National Museum Of The United States Air Force™ > Display
The O-300 is a modernized C145 and retains the same type, dimensions, cylinder bore, stroke, compression ratio, displacement and horsepower.
The GO-300 uses a gearbox, so the motor spins at 3,200 rpm and the propeller at 2,400.
The GO-300 engine has a TBO (Time Between Overhaul) of only 1200 hours, while 1800 hours is standard for the O-300 engine without a gearbox. The GO-300 also suffered from reliability issues due to poor pilot performance with the engine as well as operating at very low RPMs. This gave the Csna Skylark a bad reputation for engine reliability. Many of the Skylarks flying today are equipped with various larger displacement engines but do not have gearboxes.
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