[Top] [All Lists]

Re: Vacuum strangeness

To: "Warren Pruitt" <>, <>
Subject: Re: Vacuum strangeness
From: "Telewest \(PH\)" <>
Date: Thu, 17 Oct 2002 14:38:13 +0100
Disconnecting the vacuum line from the capsule will introduce a vacuum leak,
which if the take-off is on the carb should do nothing at idle but if it is
on the manifold would cause the revs to rise.  However the same manifold
take-off also results in max vacuum advance, so removing that pipe should
slow the engine, so I suspect you are getting no vacuum advance.  Put the
pipe on the capsule and suck on it, see if it will hold a vacuum and
actually does alter the timing.

----- Original Message -----
From: "Warren Pruitt" <>
To: <>
Sent: Thursday, October 17, 2002 1:41 PM
Subject: Vacuum strangeness

> I was helping a friend tune his 74 roadster last night and we noticed that
> when you pull the vacuum line from the manifold to the distributor the
> engine speed increased. This is the reverse of what I have typically seen.
> His car had the twin su's and the mixture and synch seemed correct. Any
> ideas as to what causes this?
> Warren

///  or try
///  Archives at

<Prev in Thread] Current Thread [Next in Thread>