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Old 11-12-2004, 04:13 PM
Tmod Tmod is offline
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Reply to Wildman926,

That test was done on my 76 Ford F-250 with a 390.

The carb is a 625 Road Demon.

During that test the full was at 15" of vacuum and the ported was at 4" of vacuum. My canister is set to start the vacuum advance @ around 10" so that is the reason that I had no difference in the advance.

Here is a chart of what vacuum advance I have at what engine vacuum (Ported or Full).

Vacuum Advance @ 5" 0
Vacuum Advance @ 10" 3
Vacuum Advance @ 15" 14.5
Vacuum Advance @ 17" 18

Reply to fried_guy,

That graph is interesting as I did not get the same results as it shows. As stated above during cruise my ported was less then full.

Last edited by Tmod; 11-12-2004 at 04:19 PM.
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