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Old 09-29-2020, 01:52 PM   #36
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Join Date: Feb 2008
Location: Kansas, USA

Originally Posted by dl242gt View Post
...operation of the B18 pcv hose oil cap setup...
Without taking apart a B18 valve cover cap, I suspect its an open passage way without a flapper valve within. At least on a vintage cap

On B18 setup, intake suction was used at bottom of block, so yes, valve cover cap would be sucking filtered air until 'excess' blow-by existed, then it would blow blow-by into air filters' cavity.

RE: "...reversal..gases....stock B230F pcv setup."

If so, then a "vintage cap" may loose its flapper seal function, as in stuck closed on mine.

Just an experiment....either real crank seal is shot, or increased blow-by exist.
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