The statement is correct, but it helps to look at it the other way round -
as the vacuum *increases* the valve tends to *close*, so preventing too much
vacuum on the crankcase sucking the oil out.
PaulH.
----- Original Message -----
From: "MonteMorris" <mmorris@nemr.net>
To: "MG list" <mgs@autox.team.net>
Sent: Saturday, March 06, 2004 3:37 PM
Subject: oil consumption
> "The PCV valve diaphragm varies the opening to the inlet manifold
according
> to the depression or crankcase pressure acting upon it. With a decrease in
> manifold depression or an increase in crankcase pressure, the diaphragm
> opens the valve allowing these crankcase gases to be drawn into the inlet
> manifold."
> Does a "decrease in manifold depression" mean less vacuum?
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