ae86andkp61 wrote:OK, Cessna drivers...can any of you explain how air-cooled airplane engine design has any significance or relationship to liquid-cooled automotive engine design?
Virtually none. An airplane engine is a totally different beast, and mechanically cruder.
I'm fairly certain the reasons for a flat engine on a plane are not ones of performance. It has much more to do with space, weight, aerodynamics, and CG (less weight hanging off the nose).
Airplane engines run differently than car engines. Car engines rev and need to perform across a wide power band. Airplane engines are designed to run at a constant 70-90% power level.
Remember, in WWII the highest performance air-corps fighters all ran inline engines and naval aircraft all used radials.
And for the record, I'm more of a Piper guy than a Cessna guy.
