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Ported vacuum or Manifold vacuum?

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Blue Meanie

Post subject: Ported vacuum or Manifold vacuum?

Posted: Wed Mar 22, 2006 10:00 pm

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Joined: Fri Aug 02, 2002 9:20 pm
Posts: 2013
Location: Copperas Cove, Texas

Without getting into a turd-flinging debate, Who's running what on their V-8 street engine. I'm running full manifold vacuum advance to my distributor.

I'm curious to see how things stack up.

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
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Farmer Joe

Post subject:

Posted: Wed Mar 22, 2006 11:43 pm

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Joined: Sat Aug 28, 2004 1:47 am
Posts: 2831
Location: Caldwell, Idaho

ive always ran the dist off the ported port on the carb.

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MEPR

Post subject:

Posted: Thu Mar 23, 2006 3:51 am

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Joined: Fri Nov 01, 2002 5:52 pm
Posts: 3427
Location: McChord AFB WA by way of Spokane WA

it should probly be run off ported vacuum. With full manifold your always pulling advance. I have done this with engines before it just means you usually set initial timing a bit lower is all.

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diarmadhim

Post subject:

Posted: Thu Mar 23, 2006 6:09 pm

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Joined: Sun Sep 21, 2003 5:10 pm
Posts: 1746
Location: Prineville, OR

ported. My manifold goes to the trans and the booster

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LUVSADRAG

Post subject:

Posted: Sat Mar 25, 2006 12:36 am

Japanese Redneck

Joined: Thu Jul 25, 2002 11:42 am
Posts: 1125
Location: San Diego, California

I run mechanical but if i run vac adv then I run ported vacuum or lock it out completely and use the MSD dial to retard for startup.

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Luvrv8

Post subject:

Posted: Sat Mar 25, 2006 12:42 am

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Joined: Fri Jul 01, 2005 9:41 pm
Posts: 6289
Location: Camarillo, CA

It must be ported. As you go to WFO you actually have no or less vacuum in the manifold. So if you timed it with manifold vac, you will release the vac advance and retard your timming, the only advance you would have is mechanical.

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Blue Meanie

Post subject:

Posted: Sat Mar 25, 2006 9:40 pm

Addicted to LUV

Joined: Fri Aug 02, 2002 9:20 pm
Posts: 2013
Location: Copperas Cove, Texas

Here's a link to a .pdf file that covers this subject in detail. It helped me zero in on my particular configuration. Now im not saying that any of you are wrong about your advance setups, but the info is worth reading to fine tune your motor to your application.

http://home.comcast.net/~chadwick.rober ... lained.pdf

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