Vacum advance: Ported or manifold: Another thread

[DocMel]

http://www.cuda-challenger.com/cc/index.php?topic=71713.0

I learned allot from this thread.  I too believed vacum advance, if used, was run off ported.  My e brock carb instructions say the same.  So I switched out to manifold vacum, then doubled checked timing:  Results:   I could not tell the dif in performance

So whats wrong?

[BB73Challenger]

From what I learned on this site is that vacum advance is for gas mileage... someone correct me if I'm wrong.


I personally don't even run a vacum advance, and my ignition likes it that way.
Replaced distrib with new Mopar unit and when I applied vacum it over advanced.
Between mechanical advance and total timing I flat out don't need it.

[mojavered]

From what I learned on this site is that vacum advance is for gas mileage... someone correct me if I'm wrong.


I personally don't even run a vacum advance, and my ignition likes it that way.
Replaced distrib with new Mopar unit and when I applied vacum it over advanced.
Between mechanical advance and total timing I flat out don't need it.

So, when you disconnect the vacuum advance, do you cap the end of both the distributor vacuum canister and the carb nipple?

[Strawdawg]

if you don't use vacuum, then you must close the nipples on the carb-no reason to put one on the can.

If attaching vacuum to the distributor does not increase advance at idle, it only means the cannister is adjusted to not begin advance at the level being provided by the carb...so one uses the adjustment screw as detailed in the last thread.

[Chryco Psycho]

there is a allen screw inside the vacuum pot that may be dialed off to prevent it advancing