Matt Whiting wrote:
Darrel Toepfer wrote:

Paul kgyy wrote:

Worst of all is to have someone just start it and ground run.


Apparently to just turn the prop over a few times is worse yet...

Why?


Matt

Mike Busch talked about this in a seminar at OSH two summers ago. The
piston rings scrape the thin layer of oil on cylinder walls downward,
but because the oil pump isn't pumping nothing is moving oil upwards.
The net result is the inner walls of the pistons have less protective
oil layer than they had to begin with.

-R