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.