> Obviously, this is well understood by the
> professionals, but is the negative pressure so slight that there
> is no reverse flow to the system and how is this regulated?
Depends on cases of course. But for long life, there needs to be a fresh
air intake supplying filtered air. This is the way modern PCV systems work.
Otherwise the blowby gases will condense moisture, varnish and acid inside
the engine, even with the vacuum. The moisture content of outside air is
far lower than that of combustion gases.
Randall
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