I'll bet there's a fair amount of pressure loss across that since it's designed for air compressor lines. In that application a couple PSI loss isn't a big deal, but compared to 18 inches of vacuum, that would be significant. It's probably restricting flow to next to nothing thru the PCV system. Guys I know have routed the crankcase vent line into a 1 liter soda bottle and caught some oil and water that way but the rest discharged to atmosphere. I suppose you could do something similar in a larger container that would let the vapor condense and drop out before getting back into the intake manifold. Maybe a cyclone separator type device would work.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.