dist vacuum

[Don Dulmage <big-d@xxxxxxxxxxxx>]

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Yes the two are different. 
maniflod vacuum is drawn from below the throttle plates and is created because the enginge is asking for more air than the carb is allowing in. The limits the peed of the engine. 
Distributor vacuum on Mopars is venturi vacuum nowadays called ported vacuum and is taken from above the throttle plates and is created by air rushing by the hole or port provided. 
This vacuum ios a function of air speed through the carb venturi (or the throttle body with FI) meaning the more air flows through thecarb the higher the vacuum at this port will be which works out perfectly for the dist advance since more air through the carb means more engine speed and now higher vacuum at the distributor port and there fore more advance as speed increases. . 
If you hooked the dist to the manifold vacuum port on the carb (often the lowest port hysically) you would have max dist advance form the vaccum advance unit at idle and none at full throttle because manifold vacuum drops as the throttle is opened (no restriction from throttle blades or at least very little) Rule of thumb is at idle there should be no vacuum on the distibutor advance . It should only come when the engine is reved. 
BTW most home done set up I see that came here for tuning had the distributor hooked to the wrong port. 
If any more quetions feel free to email. I used to teach Engine Fuels and Electrical at Provincial Trade School and firmly believe there are no dumb questions ,only dumb answers.
Don
Author of
Return to Deutschland (True Adventure)
Old Reliable (Mopar)
http://stores.ebay.ca/Don-Dulmage-Enterprises
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