andair
I have a generic Air/Oil separator on my RV-6A and I appreciate how it helps keep oil off the belly of the plane while at the same time removing impurities in the oil. A typical Air/Oil Separator takes the crank case vent tube and runs it thru a jar filled with convolutions like steel wool. The oil vapor condenses on the steel wool and then is returned to the crank case. Modern thinking says that this condensate is full of moisture & impurities and should not be returned to the engine. On my 6A the return line is plumbed to a plastic tube that empty after every flight. Andair, the makers of premium fuel control valves also makes a nice Air/Oil Separator. It turns out that Andair also recommends to not return this line to the crank case but to either collect the condensate or to vent it onto the hot exhaust, or both. The following photos show the Andair Air/Oil Separator mounted on the firewall and then collected in a cup with the overflow plumbed to the exhaust.
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