"Morgans" wrote in message
...

How come airplane engines don't have PCV valves, plumbed back into the
intake manifold, like cars? You could even use an oil separator, before
the gas enters the manifold, if too much oil was worried to be a problem.

Jim ...........

If you've ever seen the oil that collects in an oil/water separator, you
wouldn't want it back in an engine. I realize that some of the water in the
separator is condensation from the air coming back up the vent from the
outside after shutdown, but even so, the watery sludge in the reservoir is
really gross. Best to spend a few bucks and a couple of hours building a
simple firewall-mounted separator (plans available in old issues of Sport
Aviation when they had such things).

Wiping the bottom of a fuselage is kind of a Zen thing for me. Takes me back
to a simpler time.

Rich S.