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.