M20 Air/Oil separator

Mike Rapoport wrote:

But you are putting more heat in because of having the crank contact the oil
more of the time. The temp will be higher.

Is this true in Lycs and Contis? I don't know about the airplane
engines, but car engines have the upper fill limit established to
prevent this. Having the crank contact the oil will froth it pretty
quickly and the oil pump can't pump aerated oil very well. This is why
the dipstick always has a warning not to overfill. I'd be surprised if
airplane engines permitted a fill to the point of crank contact. This
is generally only done intentionally on splash lubricated engines such
as those found in cheap lawnmowers.


Matt