[DeTomaso] Vacuum Advance - ported or full vacuum source

dennis617 at aol.com dennis617 at aol.com
Mon Aug 27 11:05:30 EDT 2012


Okay, but aren't you setting your initial timing with the vacuum advance disconnected???  



-----Original Message-----
From: gow2 <gow2 at rc-tech.net>
To: dennis617 <dennis617 at aol.com>
Cc: gow2 <gow2 at rc-tech.net>; detomaso <detomaso at list.realbig.com>
Sent: Mon, Aug 27, 2012 10:59 am
Subject: Re: [DeTomaso] Vacuum Advance - ported or full vacuum source


It can effect your base timing which effects where you end up.


 But unless I don't understand something, that shouldn't matter since under
 open throttle the vacuum advance drops out of the equation anyway.



 -----Original Message-----
 From: gow2 <gow2 at rc-tech.net>
 To: dennis617 <dennis617 at aol.com>
 Cc: detomaso <detomaso at realbig.com>
 Sent: Mon, Aug 27, 2012 10:47 am
 Subject: Re: [DeTomaso] Vacuum Advance - ported or full vacuum source


 Simple answer.

 ith ported you have no vacuum at idle. Manifold you have vacuum at idle.
 You gain the ability to advance your timing at idle with Manifold. This
 ives you better throttle response and can help the engine run cooler.
 Switching from ported to manifold you might end up with more total timing
 hen you had which means you might need to reduce total timing.
 Gary


>
  Does anyone have an opinion on which source I should use for my vacuum
  advance on my Mallory Unilite distributor, full vacuum directly from the
  intake manifold or ported vacuum from the Holley 650 double pumper?  I
  have a mostly stock engine with an Edlebrock Performer intake manifold.
 I
  have recieved conflicting information from Holley and Mallory, Holley
  claims that I should use the ported vacuum at the carb and Mallory said I
  should use full vacuum from the intake manifold.
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