I received the following question from Tony about his engine bearings.
I have a question on bearings rusting in helicopters. Specifically, my heli engine bearings never seem to give me any problems. My airplane engines, stored in the same environment and using the same 20/20 heli fuel seem to all corrode and rust up within 6 months to a year.
Is it because the airplane engines are stored with the engines level and the heli engines nose up? What could be the reason other than that? Bearing quality? I run O.S. engines almost exclusively. I run the fuel out of both types at the end of the flying sessions. It’s Cool Power and it advertises “no after run necessary”, which I take literally.
I’m not sure of the answer, but I think I know someone who is.