Vacume Advance Hookup

Topic: Vacume Advance Hookup

in Forum: C3 Engines

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Posted: 11/6/05 8:38pm Message 11 of 13

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FLA VETTE

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ORLANDO, FL - USA

Joined: 12/11/2002

Posts: 459

Vette(s): 1980 L82 Dark Metallic Green Coupe, Gymkhana Suspension, AM/FM/CB, GM ZZ383....nice....

Thanks Joel. I may not be asking the question the right way. Let me try again.

Using a vacuum temperature switch means no vacuum advance until the engine is up to operating temperature but, what is the effect of connecting to ported vs unported vacuum for vacuum advance?

? if unported, vacuum advance will follow RPM?

?ported, vacuum advance will be zero at idle and then follow RPM?

1980 L82 (5069 made), Dark Green Metalic (844 made)

Gymkhana Suspension, AM/FM/CB, Sporting a ZZ383.........

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Vacume Advance Hookup

Posted: 11/6/05 8:49pm Message 12 of 13

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Adams' Apple

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Duncanville, TX - USA

Joined: 11/8/2003

Posts: 20214

Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

"What we have here.....is failure to communicate..."

Unported vac. will give the dist. full vac.=full advance all the time, except in heavy throttle, where the amount of vac. drops off.

Ported vac. will indeed be "0" vac. advance at idle, and then kick in as the throttle is opened, and the rpms will rise with the throttle opening,

Ported would be the recommended way to do it on a street-driven, basically stock engine.

Joel Adams
C3VR Lifetime Member #56
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