Robert Duquette wrote:
> So, all this to ask how the PCV really works.
>
> Here are my thoughts:
This doesn't quite agree with my line of thinking,
but again this is only my observation.
The top of the PCV valve has a tiny hole that opens
the top of the diaphragm to atmosphere. This provides
a reference to deside if the crankcase pressure is
positive.
The crank pressure is applied to the bottom of the
diaphragm, where it is "compared" to the atmospheric
at the top.
If the crankcase pressure is positive, it
lifts the diaphragm. This lifts the bullet-like
cylinder out of the intake tube, opening a pathway
up to allow it to flow into the manifold.
So essentially, if crankcase pressure is positive
compared to atmosphere, it vents into the intake.
--
Trevor Boicey, P. Eng.
Ottawa, Canada, tboicey@brit.ca
ICQ #17432933 http://www.brit.ca/~tboicey/
"Was Casper truly as friendly as they say?" - Ajax
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