[Top] [All Lists]

FW: Re: Question about Vacuum Advance

To: mgs
Subject: FW: Re: Question about Vacuum Advance
From: Mark J Bradakis <mjb>
Date: Wed, 1 Apr 1998 14:33:50 -0700 (MST)
[BOUNCE mgs@Autox.Team.Net:    Non-member submission from [ (Phil 

     Date: Tue, 31 Mar 1998 19:41:59 -0700 (MST)
     From: (Phil Bates)
     Subject: Re: Question about Vacuum Advance

Oddly enough, I have a vacuum gauge installed on my car.  As far as the 
manifold vacuum is concerned, when you put the pedal to the metal you get 
virtually no manifold vacuum.  What the distributor runs off of, however, is 
port side vacuum, and is on the other side of the throttle plate.  This is a 
little more complex, and depends on engine speed and throttle opening.  I 
used to have the gauge hooked up to port side vacuum, and as I remember it 
if the throttle plate is closed, the vacuum is very low (this happens at 
idle, or when coasting down from speed), when accelerating hard, the vacuum 
is low.  Somewhere between cruising and decelerating the vacuum is the highest.

>When one puts the pedal to the metal, does the manifold vacuum act to retard
>or advance the timing? Is the manifold vacuum higher or lower with the
>throttle open wide? Anybody know of a good book on this basic stuff?
>Bob Donahue (Still stuck in the '50s)

<Prev in Thread] Current Thread [Next in Thread>
  • FW: Re: Question about Vacuum Advance, Mark J Bradakis <=