Adjustable Vaccum Advance
Thread Starter
Drifting
Joined: May 2004
Posts: 1,258
Likes: 0
From: Huntsville Alabama
Adjustable Vacuum Advance
Who has one and is it worth it. Is it good for a street motor and how hard is it to adjust to the correct vacuum.
Last edited by Silver00V6Camaro; Mar 20, 2006 at 10:20 PM. Reason: mispelled word
Safety Car
Joined: Nov 2005
Posts: 3,961
Likes: 573
From: Lompoc, CA. Santa Barbara County
It's junk. You can control the amount of vacuum for a very short time, then it gives full advance at low vacuum levels. That's what mine did. Your results may vary. Figure out how much vacuum you want, and buy the proper canister.
Bee Jay
Bee Jay
Burning Brakes
Joined: Jun 2005
Posts: 769
Likes: 0
From: NorCal 71 Lt-1
Originally Posted by Bee Jay
It's junk. You can control the amount of vacuum for a very short time, then it gives full advance at low vacuum levels. That's what mine did. Your results may vary. Figure out how much vacuum you want, and buy the proper canister.
Bee Jay
Bee Jay
... junk, tossed mine in the garbage. was not able to adjust the canister to Lars timing sheet. i used canister VC1765 which i purchased from napa for $11. you may need a different type depending on your distributor & trans type.
Le Mans Master
Joined: Mar 2004
Posts: 7,493
Likes: 1,501
From: Little Rock AR
You could set it up yourself if you have a Mity-Vac. Set the tension so that the canister will be fully deployed at a vacuum setting that is 2" lower than your engine idle vacuum. Example: If you have 12" of manifold vacuum at idle, you want the canister to be all the way in at 10" of vacuum. That way you can hook it up to manifold vacuum and the idle will be stable.
The amount of vacuum advance degrees is some times limited with an add-on eccentric cam inside the distributor. Not the best setup but that is what comes in the aftermarket kit. You can set that so you get about 52 degrees total from the sum of the initial setting + all the centrifugal + all the vacuum advance.
Buying the right canister in the first place is probably easier and it is definately cheaper.
-Mark.
The amount of vacuum advance degrees is some times limited with an add-on eccentric cam inside the distributor. Not the best setup but that is what comes in the aftermarket kit. You can set that so you get about 52 degrees total from the sum of the initial setting + all the centrifugal + all the vacuum advance.
Buying the right canister in the first place is probably easier and it is definately cheaper.
-Mark.
