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Author Topic: Vacuum advance  (Read 2507 times)

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Offline 1974pintowagon!

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Vacuum advance
« on: July 17, 2017, 07:21:22 AM »
Where is best on a stock 2.3 to hook up the vacuum advance? Manifold or ported vacuum? Where is yours hooked up?
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Offline rob289c

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Re: Vacuum advance
« Reply #1 on: July 18, 2017, 07:40:57 PM »
My Mustang is hooked to a ported source.  I believe manifold vacuum would be at full advance all the time.
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Offline pintofarm

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Re: Vacuum advance
« Reply #2 on: July 19, 2017, 08:39:32 AM »
Only at idle is there a difference.  Both sources operate exactly the same off idle. So hook it to whatever source that provides the idle that you like.
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Offline The Whistler

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Re: Vacuum advance
« Reply #3 on: July 19, 2017, 12:18:53 PM »
Sorry to tell you port and direct vacuum do not operate the same at any point! Most Fords use Port vacuum! That includes all Pinto!
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Offline dick1172762

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Re: Vacuum advance
« Reply #4 on: July 19, 2017, 03:14:12 PM »
YOUR SO RIGHT Whistler!
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Offline pintofarm

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Re: Vacuum advance
« Reply #5 on: July 20, 2017, 10:35:55 AM »
Could either of you please explain IN DETAIL how they operate differently than I stated above?
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Offline dick1172762

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Re: Vacuum advance
« Reply #6 on: July 20, 2017, 10:49:23 AM »
Go to the Holley web site to find out. They tell it all better than I can.
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Offline dennisofaz

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Re: Vacuum advance
« Reply #7 on: July 20, 2017, 05:57:22 PM »
The difference between ported and manifold vacuum is:
Ported vacuum is low at idle (closed throttle), and full vacuum at open throttle.
Manifold vacuum is high at closed throttle, and low at open throttle.


Dennis
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Offline dick1172762

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Re: Vacuum advance
« Reply #8 on: July 21, 2017, 03:52:14 PM »
Go to http://www.mortec.com/carbtip1.htm  for a very good site on Holley carbs. These people know Holleys.
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Offline justplainwill72

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Re: Vacuum advance
« Reply #9 on: July 23, 2017, 06:24:59 PM »
All mine have been ported....but I prefer the mallory yl....kinda expensive but setup correctly and it's killer
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Offline dick1172762

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Re: Vacuum advance
« Reply #10 on: July 24, 2017, 01:04:47 PM »
Think of it this way. Holley would not put the port outlet on the carbs unless it was the way to go. Don't fight it unless you have no vacuum port to use. If manifold vacuum is all you have, try it.
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