Quote:
Originally Posted by Dean
OK, that is what I was thinking, but did not see that as the conclusion on IWSTI and such.
Another question I have is why is there a perceived pressure differential between crankcase and heads that has to be dealt with? They are definitely connected by large enough oil drain passages to allow any instantaneous surge to quickly equalize. Is there something I am missing?
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That's something I never really understood. The best guess I've got is that if the crank breather can't relieve the blow-by pressure in the crankcase, that pressure pushes oil into the heads and exasperates the issue with oil coming out the valve breathers as the valve breathers end up taking the "overflow" pressure from the crank.
By keeping the valve breather lines smaller than the crank breather line, apparently that helps keep the "path of least resistance" out the crank breather. But I'm not so sure I believe the science behind that theory.