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carter avs adgustments #1406973 03/23/13 10:11 AM 03/23/13 10:11 AM
Joined: Aug 2004 Posts: 1,960 Kenosha, Wi G GOLDMYN OP top fuel
GOLDMYN OP top fuel G Joined: Aug 2004 Posts: 1,960 Kenosha, Wi	Hi, can someone tell me what the screw in the upper center does, I've turned it to various setting with no results?...thanks 7637012-resizecarb.jpg (411 downloads) Semper Fi

Re: carter avs adgustments [Re: GOLDMYN] #1406974 03/23/13 10:58 AM 03/23/13 10:58 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	I'm thinking that it is a "hot idle compensator" used on some OE carters that lets additional air in under some conditions. That's as much as I know. I was not aware that it was adjustable live every 24 hour block of time like it's your last day on earth

Re: carter avs adgustments [Re: RapidRobert] #1406975 03/23/13 11:02 AM 03/23/13 11:02 AM
Joined: Aug 2004 Posts: 1,960 Kenosha, Wi G GOLDMYN OP top fuel
GOLDMYN OP top fuel G Joined: Aug 2004 Posts: 1,960 Kenosha, Wi	The carb is a 4617s for 1969 383 w/4spd Semper Fi

Re: carter avs adgustments [Re: RapidRobert] #1406976 03/23/13 11:10 AM 03/23/13 11:10 AM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	If you mean that black screw just above the rubber hose, that's your idle mixture screw, that style is typical of 1968/early 69 AVS carbs, later versions eliminated that one and added two adjustment screws below and adjacent to either side of that screw. You most likely have your idle speed set too high or a vacuum leak somewhere which makes idle mixture adjustments ineffective.

Re: carter avs adgustments [Re: ScottSmith_Harms] #1406977 03/23/13 11:38 AM 03/23/13 11:38 AM
Joined: Aug 2004 Posts: 1,960 Kenosha, Wi G GOLDMYN OP top fuel
GOLDMYN OP top fuel G Joined: Aug 2004 Posts: 1,960 Kenosha, Wi	thank-you Semper Fi

Re: carter avs adgustments [Re: ScottSmith_Harms] #1406978 03/23/13 12:42 PM 03/23/13 12:42 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Quote: If you mean that black screw just above the rubber hose, that's your idle mixture screw, that style is typical of 1968/early 69 AVS carbs, later versions eliminated that one and added two adjustment screws below and adjacent to either side of that screw. You most likely have your idle speed set too high or a vacuum leak somewhere which makes idle mixture adjustments ineffective. I agree that it controlls the idle mixture. Kinda weird having only the one screw but later years were capped and you could not adjust any without drilling or knocking the caps off. And it looks like it has caps where the standard mixture screws went. Some of the Carters had a larger screw right below where that one is that was an idle (air) speed screw as it controlled the air around the throttle blades for idle speed. But I agree that one is the idle mixture screw. Ron Last edited by 383man; 03/23/13 12:44 PM.

Re: carter avs adgustments [Re: 383man] #1406979 03/23/13 12:46 PM 03/23/13 12:46 PM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	Right Ron, early AFB Carters had the big screw in the front, an early design which was pretty much done away with by 1967 when the idle speed screw was added to the drivers side linkage. The large brass screw in the front as shown in these 66/67 Hemi carbs. Basically a just large controlled vacuum leak that allows you to adjust idle speed. 7637150-66-67HemiCarbs.jpg (225 downloads)

Re: carter avs adgustments [Re: ScottSmith_Harms] #1406980 03/23/13 01:14 PM 03/23/13 01:14 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Yes that the ones I have seen alot of. Dont see many like the OP carb with the one mixture screw. Thats some real purdy carbs. Ron Last edited by 383man; 03/23/13 01:14 PM.

Re: carter avs adgustments [Re: GOLDMYN] #1406981 03/23/13 04:05 PM 03/23/13 04:05 PM
Joined: Jan 2003 Posts: 75,082 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,082 U.S.S.A.	Quote: The carb is a 4617s for 1969 383 w/4spd That carb is for 440HP with auto trans , the correct carb for 383 w/4spd is 4615S

Re: carter avs adgustments [Re: JohnRR] #1406982 03/23/13 05:21 PM 03/23/13 05:21 PM
Joined: Jan 2003 Posts: 9,436 Blair County,PA 62maxwgn master
62maxwgn master Joined: Jan 2003 Posts: 9,436 Blair County,PA	Quote: Quote: The carb is a 4617s for 1969 383 w/4spd That carb is for 440HP with auto trans , the correct carb for 383 w/4spd is 4615S John,I really hate to correct you but the 4617 is a 69 4spd carb,me even got's one !! 7637416-Picture454.jpg (220 downloads)

Re: carter avs adgustments [Re: 62maxwgn] #1406983 03/23/13 06:50 PM 03/23/13 06:50 PM
Joined: Nov 2008 Posts: 1,565 tennessee P pushbutton pro stock
pushbutton pro stock P Joined: Nov 2008 Posts: 1,565 tennessee	69 383 4 speed 4615S.

Re: carter avs adjustments [Re: ScottSmith_Harms] #1406984 03/23/13 08:21 PM 03/23/13 08:21 PM
Joined: Jan 2003 Posts: 15,476 Omaha Ne T TJP I Live Here
TJP I Live Here T Joined: Jan 2003 Posts: 15,476 Omaha Ne	OK my :two cents: for what it's worth. the late 60's brought on emission controls from bit brother. The thought behind the single adjustment screw was that it would limit "peoples" ability to fatten up the mixture by capping off the Normal mixture screw IE: being two. Those screws were "FIXED" and the single screw limited adjustments that would KEEP the Emission in range of BIG BROTHERS targets. HMM a GOOD, but BAD idea as the car so equipped ran to lean and resulted in MEGA drivability issues / complaints. The SAVVY dealership / mechanic realized that by pulling the two LOWER plugs they could then access the HIDDEN mixture screws, tweak it up and the ISSUES went away. The design was only around for a year or two for obvious reasons. Feel free to flame away if what i have posted is incorrect. An old man from back in the day www.tandmautomotive-omaha.com

Re: carter avs adjustments [Re: TJP] #1406985 03/23/13 09:30 PM 03/23/13 09:30 PM
Joined: Jan 2003 Posts: 9,436 Blair County,PA 62maxwgn master
62maxwgn master Joined: Jan 2003 Posts: 9,436 Blair County,PA	Quote: OK my :two cents: for what it's worth. the late 60's brought on emission controls from bit brother. The thought behind the single adjustment screw was that it would limit "peoples" ability to fatten up the mixture by capping off the Normal mixture screw IE: being two. Those screws were "FIXED" and the single screw limited adjustments that would KEEP the Emission in range of BIG BROTHERS targets. HMM a GOOD, but BAD idea as the car so equipped ran to lean and resulted in MEGA drivability issues / complaints. The SAVVY dealership / mechanic realized that by pulling the two LOWER plugs they could then access the HIDDEN mixture screws, tweak it up and the ISSUES went away. The design was only around for a year or two for obvious reasons. Feel free to flame away if what i have posted is incorrect. An old man from back in the day That's why the mixture screws have been replaced on the one I have!

Re: carter avs adjustments [Re: 62maxwgn] #1406986 03/23/13 10:08 PM 03/23/13 10:08 PM
Joined: Jan 2003 Posts: 7,545 Albany, NY 67SATisfaction The member whose name is actually Art
67SATisfaction The member whose name is actually Art Joined: Jan 2003 Posts: 7,545 Albany, NY	Good info here and I'll just add one very basic comment based on the 'rookie' mistake I made with my AVS: That needle screw or screws is an air circuit, not fuel. So backing it out adds air to the mixture, not fuel. Live & learn. 65 Satellite hardtop 361/4bbl console 727 2.76 67 Satellite convert 383/2bbl column 727 3.23 67 Lancia Fulvia Sport 1.3 Zagato. Alloy body, 1.3L V4 DOHC 4-spd 67 Lancia Fulvia Rallye 1.3. Alloy panel, 1.3L V4 DOHC 4-spd 71 Alfa Romeo GT Junior 1300 Zagato, 1.3L 4cyl DOHC hemi 5-spd 82 Alfa Romeo GTV6 2.5L SOHC hemi V6 5-spd transaxle 75 Maserati Bora US spec 4.9L DOHC hemi V8 5-spd ZF 77 Maserati Khamsin Euro spec 4.9L DOHC hemi V8 5-spd ZF 07 Aston Martin DB9 6.0L DOHC V12 6spd transaxle

Re: carter avs adjustments [Re: 67SATisfaction] #1406987 03/24/13 01:14 AM 03/24/13 01:14 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Quote: Good info here and I'll just add one very basic comment based on the 'rookie' mistake I made with my AVS: That needle screw or screws is an air circuit, not fuel. So backing it out adds air to the mixture, not fuel. Live & learn. There are also some Holley four barrels like that. I think most Holleys like that say it on the side as they control the idle air bleed air. Turning the screw out leans it out. Ron

Re: carter avs adjustments [Re: TJP] #1406988 03/24/13 03:17 AM 03/24/13 03:17 AM
Joined: Jul 2003 Posts: 6,167 Maryland GO_Fish master
GO_Fish master Joined: Jul 2003 Posts: 6,167 Maryland	Quote: OK my :two cents: for what it's worth. the late 60's brought on emission controls from bit brother. The thought behind the single adjustment screw was that it would limit "peoples" ability to fatten up the mixture by capping off the Normal mixture screw IE: being two. Those screws were "FIXED" and the single screw limited adjustments that would KEEP the Emission in range of BIG BROTHERS targets. HMM a GOOD, but BAD idea as the car so equipped ran to lean and resulted in MEGA drivability issues / complaints. The SAVVY dealership / mechanic realized that by pulling the two LOWER plugs they could then access the HIDDEN mixture screws, tweak it up and the ISSUES went away. The design was only around for a year or two for obvious reasons. Feel free to flame away if what i have posted is incorrect. An old man from back in the day Correct, the virgin AVS on my 69 340 GTS has the center mixture screw. I personally picked out the OE lead plugs over the recessed lower (conventional) mixture screws with dental pic and then adjusted the carb to what the 340 wanted. Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph

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