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Username Post: Vacuum Advance- how is it supposed to work?
Mr. Sinister
Posts 559
Mr. Sinister
04-05-10 05:37 PM - Post#1893489    

ignitionman: this applies only to the aftermarket can?
i have an msd pro-billet rtr distributor, and as far as i know, msd does not make a can the fully deploys at lower vacuum, so i have to find a can that is compatible. i have been talking with a guy on another board that is playing with using a counter spring to have the same affect as a low vacuum can, so i'm waiting to see where that goes. otherwise, i'll be using an aftermarket can as well.

what changes would need to be made for a smaller engine? say like a 350 or a 327? the problem i've run into with my stock msd can, is not being able to get the idle down in park/neutral (1100-1200 after adjusting the idle screw, idle mixture has NO effect) and not being able to get it up in gear (hovers around 500, BADLY chugging the engine). apart form idle issues, response and low end power are greatly improved, with a noticeable reduction in that "rich" smell out the tailpipes. the only variable left if the low vacuum can, which i have yet to replace.

and yes, that writeup has been around for quite a while, i don't try to take credit for it.
Bill -
55 Chevy 210 2 Door Sedan Hot Rod
68 Caddy Coupe DeVille Kustom - SOLD!!

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