And....

When preheating, the metal propeller is a HUGE heat radiator, keeps
the front of the engine cooler than the rest, hence more
condensation in that area....

Some get mittens for their props...

Dave


On Sun, 20 May 2007 14:00:11 GMT, Orval Fairbairn
wrote:

In article ,
Roy Smith wrote:

Orval Fairbairn wrote:
Lycomings, especially, suffer from #1 and #2 cam erosion, due to
condensation in the upper front of the crankcase.

Curious. Why would you get more condensation in the upper front part of
the crankcase than anywhere else?

That is the area where ventilation is least -- also, the highest point
of the inside of the crankcase when the aircraft is at rest.