Through normal operation your engines blow the first quart overboard ending up on the wing and the flaps. I could tell you that this was a design by Lycoming in an effort to prevent corrosion in those areas, but that wouldn’t play very well, so we won’t even go there! Seriously, it’s nothing to worry about, as long as your engine does not have a history of excessive oil consumption.
Ask Paul
Ask Paul: How old is this vintage engine?
This 1946 engine may very well be able to be overhauled and put back in service, providing you have the engine logbook.
Does my engine have morning sickness?
Corrosion is probably the biggest contributing factor when it comes to fatigue failures on valve springs.
Ask Paul: Should I buy a plane that hasn’t been flown in two years?
What should I be concerned with when buying an airplane that hasn’t been flown in two years?
Ask Paul: Should we replace the pistons or change oil?
I suspect that the blow-by is caused by glazed cylinder walls. This could possibly be a result of improper break-in, so let’s begin there.
Ask Paul: Can I permanently remove the vacuum pump?
There is no problem removing the vacuum pump drive from the engine — and there are actually two options for you.
Why is my engine backfiring?
I believe you are hearing the pops is because something has a crack in it.
Is a tiny bit of escaping noise OK with properly sealing rings?
The worst thing you can do is to baby the engine.
Should I switch engines on my Super Sport?
If all is working well, why kick a sleeping dog?