There are different units around, but most perform both functions :
serve as a restriction to limit the flow of air and fumes from the
crankcase into the intake manifold, and also as a checkvalve to ensure
that fuel/air from the intake manifold cannot be drawn back into the
crankcase.
Randall
David Read wrote:
>
> I could be wrong here, but ....
> I thought the purpose of the PCV valve was to prevent crancase fumes
> polluting the atmosphere by allowing diluting air in but not out except
> by means of an alternative path into the engine's cylinders.
> ----- Original Message -----
> From: "David Kernberger" <dkern@napanet.net>
>
> > Jim et al.
> >
> > I think you have hit the nail on the head. The only purpose of the
> > Positive Crankcase Ventilation valve (PCV valve) is to restrict
> suction
> > applied to the crankcase under conditions of high intake manifold
> vaccuum
> > but to remove all such restriction when manifold vaccuum is low.
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