- Sep 17, 2008
Even better, don't ground-run that engine. Fly it or leave it alone. Internal engine corrosion is primarily due to water vapor in blowby gases getting into the case and condensing there, reacting over time with the oil and forming acids that eat the engine. Flying it gets the engine and oil hot enough to drive the moisture out the breather tube.Ok that makes sense. It would help if it could protect the cylinders when the rainy season hits here on the BC coast.
I have found water droplets between the piston and cylinder walls in engines run up before inspection. Found water in the rocker covers, too. Lots of it. And this was in flight school airplanes hangared every night and flown nearly every day.