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Juist my best guess based on your description and what I've read. Could easily be wrong since I'm not completely sure I understoodor or correctly remember the descriptions..
No real experience with PCV valves since AFAIK I've never had a car with one, since I run old cars.
My DOHC 2L Ford Sierra (highest tech so far) may have had one, but it never gave me a reason to find out.
Current car is a 1986 Daihatsu Skywing, which has given me ample reason to investigate how it works (or doesn't) and I'm fairty sure it just applies unregulated manifold vacuum to the crankcase.
It has a system of baffles to recover oil, and doesn't use much either. Vacuum will be highest at idle, when crankcase turbulence will be least, so relatively little oil vapour will be entrained.
If your cylinders are in good nick, in combination with a closed PVC valve (or collapsed hose), which is restricting flow, there will be relatively little blowby, and thus relatively little gas flow (as distinct from vacuum) to entrain oil vapor..
I said stuck open above. Stuck closed would make more sense.
(Should have just stuck with stuck, to cover myself.)
To quote Python's Anne Elk, that's my theory, which is mine.
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Edited by edlithgow on 23/08/2019 at 23:43
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