Yes or No question about ported vacuum - Team Camaro Tech
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post #1 of 5 (permalink) Old Apr 23rd, 04, 07:32 PM Thread Starter
 
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When vacuum advance is connected to ported vacuum does it add that timing at all at WOT? I was told that it cannot add timing at WOT because there is not any vacuum but I would think it could pull it a little, so whats the answer?
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post #2 of 5 (permalink) Old Apr 23rd, 04, 08:01 PM
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No vacuum advance does not add timing at WOT. I run direct manifold vac to adv unit for more timing at idle and works well for my cam and improved idle characteristics. SS

406, TKO 600 and 12 bolt posi.
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post #3 of 5 (permalink) Old Apr 24th, 04, 10:07 AM
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Doesn't matter where it's connected at WOT - there's no vacuum there; only matters at idle. [img]graemlins/thumbsup.gif[/img]

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post #4 of 5 (permalink) Old Apr 26th, 04, 03:27 AM
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And about mpg at idle and low RPM cruising speeds? which set up gives better mpg?

Camaro 1968, propane 327ci, Big Brake, Hotchkis, T56
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post #5 of 5 (permalink) Old Apr 26th, 04, 05:20 AM
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Full manifold vacuum to your vacuum advance will improve the idle efficiency. At cruise the ported vacuum signal is equal to the manifold vacuum signal so it's a tossup.

"For those that will fight for it...FREEDOM ...has a flavor the protected shall never know."
Semper Fi! L/Cpl Edwin L. "Tim" Craft, B Co 3rd AT's, Khe Sanh Combat Base, February, 1968
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