re; Enclosed crankcases have always needed ventillation due to
vaporized oil, combustion gasses leaking past piston rings (blowby),
etc. It all has to go somewhere.
Actually they need ventilation because of the air pushed by downward
moving pistons--wouldn't want compression in this direction and in
this area. No need to create vacuum to draw out fumes--they'll be
pushed out, won't they? In fact, it would seem the system would need
to be able to breathe both directions, i.e., in and out. Perhaps
there is always a piston going up for each piston going down in our
favorite V8, but not on every engine, for example my BMW boxer twin
motorcycle. I always thought the prettiest looking crankcase
ventilation was on Indy Offenhausers.
Kent Christensen
Albuquerque
'89 Range Rover
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