<VV> Modulator valve

[BBRT]

Stephen,

The Corvair '60 and '61 shop manuals do not have a value.  They say, pull a 
vacuum and if it leaks it is no good. However, a normal engine vacuum 
according to an old '71 Chilton's is 18-20".  The Ford auto trans in that 
book says it should hold 18" vacuum. It also says when releasing vacuum on 
modulator, hold your finger over modulator shaft so the spring doesn't 
extend it. You'll have to do further research to answer your question.

Chuck S
BBRT
----- Original Message ----- 
From: "Stephen Upham" <contactsmu at sbcglobal.net>
To: "Virtual Vairs" <virtualvairs at corvair.org>
Sent: Saturday, May 17, 2008 9:14 AM
Subject: <VV> Modulator valve


> I'll ask this one last time as no-one seems to know the answer, or if
> they do, they're not talking (at least not about pertinent mechanical
> issues of the Corvair).
> What is the proper vacuum HG for the PG vacuum modulator to begin
> opening and reach its maximum aperture as measured with a Mityvac
> attached to the end (this is one that is not installed yet) ?
>
> Stephen "Diogenes - looking for one good answer" Upham
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