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Vacuum Advance at Idle
#3037277
04/26/22 03:13 PM
04/26/22 03:13 PM
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Joined: Jan 2003
Posts: 1,194
Rochester, New York
GregY
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 1,194
Rochester, New York
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Hi All,
I am trying to tune the timing and carb on my 440.
With the vacuum advance disconnected and plugged, I can get things to where I am happy with them (vacuum, timing, idle speed), but as soon as I plug in the vacuum advance, the idle speed shoots up like 500 rpm, and I can't get it back below a 1,000 or 1,100 rpm even with the idle speed screw backed all the way out.
I know I want to run the vacuum advance, but I feel like something isn't right, maybe with the vacuum advance canister?
I am going to do a little more research, but any advice in the meantime is appreciated.
Thanks.
Greg
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Re: Vacuum Advance at Idle
[Re: GregY]
#3037280
04/26/22 03:21 PM
04/26/22 03:21 PM
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Joined: May 2019
Posts: 6,252
nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,252
nowhere
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Hi All,
I am trying to tune the timing and carb on my 440.
With the vacuum advance disconnected and plugged, I can get things to where I am happy with them (vacuum, timing, idle speed), but as soon as I plug in the vacuum advance, the idle speed shoots up like 500 rpm, and I can't get it back below a 1,000 or 1,100 rpm even with the idle speed screw backed all the way out.
I know I want to run the vacuum advance, but I feel like something isn't right, maybe with the vacuum advance canister?
I am going to do a little more research, but any advice in the meantime is appreciated.
Thanks.
Greg
You are using the wrong vacuum port. You want what is called ported vacuum. It doesn't have vacuum at idle. The vacuum nipple is above the throttle blades when they are closed.
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Re: Vacuum Advance at Idle
[Re: GregY]
#3037282
04/26/22 03:23 PM
04/26/22 03:23 PM
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Joined: Nov 2003
Posts: 10,228
Colleyville
3hundred
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,228
Colleyville
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Hook it up to the ported port, if you see two in the base plate, it'll be the higher of the two. A Holley port will be on the right (passenger) side of the primary metering block.
'68 Fury Convertible
'69 300 Convertible
'15 Durango 5.7 Hemi
'16 300 S Hemi
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