Whoa. For a start another main reason for PCV is to remove condensation
from the crankcase. In cold weather on short journeys this can develop to a
thick creamy emulsion and cause internal corrosion.
Even more of a Whoa is that inlet manifold vacuum is *not* applied to the
crankcase directly. The breather port on SU carbs is situated between the
throttle butterfly and the piston. Without going into the details the
effect of that is to apply a relatively constant vacuum of only a couple if
inches Hg. - a by-product of the constant-depression feature of the carbs -
not full manifold vacuum which can be as high as 25 in.Hg. Before SUs had
the port, and with non constant-depression carbs, a PCV valve is fitted
which *is* plumbed into the inlet manifold, but which again reduces manifold
vacuum to just a couple of in.Hg. It's when this valve sticks or the
diaphragm ruptures that full inlet manifold vacuum *can* be applied to the
crankcase, and that usually causes high oil consumption.
PaulH.
----- Original Message -----
From: "Greg A Myer" <motorhead45@juno.com>
To: <mgb-v8@autox.team.net>
Sent: Thursday, September 24, 2009 3:56 PM
Subject: [Mgb-v8] Oops
> That didn't work.
> Let's try it again.
> http://www.britishv8.org/British-V8-Current-Issue.htm
>
> That should be better.
> Greg
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