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Carter afb idle air circuit mod.
#2469441
03/20/18 11:26 PM
03/20/18 11:26 PM
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Joined: Aug 2003
Posts: 4,384 Madison Wi
NTOLERANCE
OP
master
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OP
master
Joined: Aug 2003
Posts: 4,384
Madison Wi
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Anyone ever done this to an afb?
“The solution to idle quality on "driver" vehicles (not numbers matching) is to install a conventional idle control. There is a "dimple" in the lower casting on the front drivers side (where the normal curb idle screw would be located). Drill through the dimple using a number 21 drill, and tap for a number 10 x 32 machine screw. Obtain a 10 x 32 machine screw and spring at the local hardware or auto parts store. Install the screw and spring. Screw the idle air screw all the way in, and then adjust the idle the conventional way.
If you wish to leave the adjust as the factory suggested with the idle air screw: for MOST applications, the beginning settings would be 1 turn on the idle mixture screws and 1 1/2 turns on the idle air screw.
Where these carbs are really useful is for those using big cams (low vacuum). The idle air screw, used in conjunction with the conventional idle screw is an adjustable idle bypass. Remember the holes drilled by the factory in the throttle plate on some of the performance carbs? No need to drill, as the idle air screw will do exactly the same function, and it is adjustable.”
I used to care but....... things have changed
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Re: Carter afb idle air circuit mod.
[Re: NTOLERANCE]
#2469787
03/21/18 04:22 PM
03/21/18 04:22 PM
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Joined: Aug 2003
Posts: 4,384 Madison Wi
NTOLERANCE
OP
master
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OP
master
Joined: Aug 2003
Posts: 4,384
Madison Wi
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I got the description. For this mod off another web site so i done have pics.
I was ready to drill holes on my thorottle plates when I ran across this
I used to care but....... things have changed
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Re: Carter afb idle air circuit mod.
[Re: Jim_Lusk]
#2469801
03/21/18 04:55 PM
03/21/18 04:55 PM
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Joined: Feb 2003
Posts: 16,146 Mesa, Arizona
dart4forte
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 16,146
Mesa, Arizona
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I believe that is for '68 and some '69 AVS carbs. Those are the only ones that I know of that have the idle air bleed screw and blocked off idle mixture screws. Yeah, its the 68 AVS with the single air/fuel mixture screw.
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: Carter afb idle air circuit mod.
[Re: NTOLERANCE]
#2469998
03/21/18 09:14 PM
03/21/18 09:14 PM
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Joined: Jun 2004
Posts: 1,672 Virginia
HemiStan
top fuel
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top fuel
Joined: Jun 2004
Posts: 1,672
Virginia
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This is referring to early AFB’s. My ‘66 Hemi has them. There is not an idle speed screw, only an air mixture screw on the front.
Stan
Last edited by HemiStan; 03/21/18 09:16 PM.
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