Originally Posted by
Aussie Bob
So I owned this early model 172, 6 cylinder Continental, 145HP @ 2600 RPM. From the placard on the engine: 145 HP @ 2600 135 HP @ 2500 etc. No rocket science required to work out that 100 RPM = 10 HP
Ummm, actually the O-300 developed 145 hp a 2700 rpm, but I'm sure you remember all the other details correctly.