[Healeys] PVC value question

[warthodson at aol.com]

If you mean that the valve some how does that I do not see how. The negative
pressure in the crank case created by pulling the blow by gasses into the
intake manifold or air cleaner is what eliminates or reduces the crankshaft
seal leakage. Assuming the negative pressure is greater that the blow by.
Gary Hodson

-----Original Message-----
From: john spaur <jmsdarch at sbcglobal.net>
To: warthodson <warthodson at aol.com>
Cc: healeys <healeys at autox.team.net>
Sent: Sun, Dec 16, 2012 1:50 pm
Subject: Re: [Healeys] PVC value question


According to a tech tip by Norman Nock the modification is meant toeliminate
the rear crankshaft seal leak by "removal of a positivecrankcase pressure to a
negative pressure".

John Spaur
San Jose, CA

At 08:20 AM 12/16/2012 -0500, warthodson at aol.com wrote:

In myopinion either location will provide positive crankcase ventilation.
Myrelated question is what purpose does adding the valve into the PVCserve?
Gary Hodson
-----Original Message-----
From: john spaur <jmsdarch at sbcglobal.net>
To: healeys <healeys at autox.team.net>
Sent: Sat, Dec 15, 2012 6:17 pm
Subject: [Healeys] PVC value question


An article on John Sim's website shows the installation of aPVC
valve. However, the vacuum source is from the intake manifold on the
front carburetor for a tri-carb.

Why can't the vacuum source come from the rear carb air filter where
the existing crankcase ventilation hose connects?

Thank you,

John Spaur
'62 BT7
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