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Username Post: Vacuum Advance- how is it supposed to work?
Mr. Sinister 
Contributor
Posts: 555
Mr. Sinister
Age: 40
Loc: Fair Hill, MD
Reg: 05-18-09
04-05-10 02:02 PM - Post#1893374    
    In response to Mr. Sinister

petroholic: yep, pretty much it. you only need to back your mechanical advance off enough to prevent pinging, if present, as vacuum advance only applies to part-throttle operation. the old "32-36 degrees at 3000" rule still applies, and the vacuum can won't affect that. all this assumes you're running 93 octane.
you only need the can if you have low idle vacuum, particularly in gear. most stock style hei cans and even the msd cans are designed to work with 15 inches of vacuum at idle, so while running the low vacuum can won't hurt you, you may not need it.
Bill -
55 Chevy 210 2 Door Sedan Hot Rod
http://imgur.com/a/CfOc6
68 Caddy Coupe DeVille Kustom
http://imgur.com/a/m7gdR

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