MAX WEDGE IDLE ADJUSTMENT

MIKESPOLARA

Well-Known Member
Local time
1:32 PM
Joined
Jun 16, 2021
Messages
706
Reaction score
731
Location
CALIF
What is the correct way to change idle adjustment on max wedge carbs
 

33 IMP

FBBO Gold Member
FBBO Gold Member
Local time
1:32 PM
Joined
Dec 21, 2017
Messages
7,652
Reaction score
10,719
Location
taxifornia,soon 2b Arizona.
Okay now let's get serious. Are you talking idle speed, or mixture? Too lean, too fat too fast, or what?
 

MIKESPOLARA

Well-Known Member
Local time
1:32 PM
Joined
Jun 16, 2021
Messages
706
Reaction score
731
Location
CALIF
Idle speed. I haven't looked at carbs closely so I don't know if there might be one screw on the linkage to adjust both evenly or do I have to do each carb?
 

RJRENTON

FBBO Gold Member
FBBO Gold Member
Local time
3:32 PM
Joined
Jul 1, 2015
Messages
2,779
Reaction score
2,665
Location
South Shores area of Decatur, Illinois
Idle speed. I haven't looked at carbs closely so I don't know if there might be one screw on the linkage to adjust both evenly or do I have to do each carb?
It depends on which carbs you have. The earlier Carter # 3447 S, used an Idle air bypass screw in the primaries of each carb. The later Carter # 3705 S or SA, used an idle stop screw on the thtottle linkage side. The linkage length can be adjusted independently from the common bellcrank but you have to insure that both carbs are at WOT at the same time. Hope this helps...
BOB RENTON
 

MIKESPOLARA

Well-Known Member
Local time
1:32 PM
Joined
Jun 16, 2021
Messages
706
Reaction score
731
Location
CALIF
3447 sa
Idle seems a little low BUT I really haven't driven the car yet so idle may change when at operating temp
 

33 IMP

FBBO Gold Member
FBBO Gold Member
Local time
1:32 PM
Joined
Dec 21, 2017
Messages
7,652
Reaction score
10,719
Location
taxifornia,soon 2b Arizona.
Thanks Bob, apparently there is a secret to the 3447s that I didn't know about, having had only 3705 or competition carter's. I'm guessing what is obvious on my carbs isn't so obvious on a 3447.
(Frankly, I was thinking he was having trouble cause he was using edelbrock carbs)
 

MIKESPOLARA

Well-Known Member
Local time
1:32 PM
Joined
Jun 16, 2021
Messages
706
Reaction score
731
Location
CALIF
It depends on which carbs you have. The earlier Carter # 3447 S, used an Idle air bypass screw in the primaries of each carb. The later Carter # 3705 S or SA, used an idle stop screw on the thtottle linkage side. The linkage length can be adjusted independently from the common bellcrank but you have to insure that both carbs are at WOT at the same time. Hope this helps...
BOB RENTON


Screw between the idle mixture screws. So do they have to be balanced some how? If I want to increase idle speed slightly, screw one and then the other or what's the proper procedure? Thanks.
 

MIKESPOLARA

Well-Known Member
Local time
1:32 PM
Joined
Jun 16, 2021
Messages
706
Reaction score
731
Location
CALIF
Thanks Bob, apparently there is a secret to the 3447s that I didn't know about, having had only 3705 or competition carter's. I'm guessing what is obvious on my carbs isn't so obvious on a 3447.
(Frankly, I was thinking he was having trouble cause he was using edelbrock carbs)

Still takes a screw driver
 

Dipstick

Well-Known Member
Local time
1:32 PM
Joined
Oct 26, 2018
Messages
1,133
Reaction score
1,149
Location
Out West
3447 sa
Idle seems a little low BUT I really haven't driven the car yet so idle may change when at operating temp

Turn the big brass screw counterclockwise to allow more in and increase the idle speed.
 

Beekeeper

It’s a disease without a cure!
FBBO Gold Member
Local time
3:32 PM
Joined
Jul 4, 2012
Messages
4,160
Reaction score
4,127
Location
Rogersville,TN.
You can get them doing the same amount of work with a carb uni-syn device.
 

R413

Well-Known Member
Local time
1:32 PM
Joined
Feb 4, 2019
Messages
3,093
Reaction score
6,248
Location
NW USA
You can get them doing the same amount of work with a carb uni-syn device.

you need to do that to have it idle and run it’s best. You can try your beast then get a unisyn and it will be a big improvement.

Is this a new Car to you? Why not drive it and see how it does warmed up? Advancing the timing will increase the idle speed. Check where The timing is now.

EDIT: Dvorak sold an adapter, you can make one to fit the top of the carb. It is well worth your time to dial in both carbs the same.
 
Last edited:

RJRENTON

FBBO Gold Member
FBBO Gold Member
Local time
3:32 PM
Joined
Jul 1, 2015
Messages
2,779
Reaction score
2,665
Location
South Shores area of Decatur, Illinois
You can get them doing the same amount of work with a carb uni-syn device.

YES.....couldn't think of the name of the device....but I'm not sure if a Unisyn device came in a 4-7/8" diameter to fit the 3447-S air horn or the 5-1/4" diameter of the 3705-S air horn. Its been years since I've fooled around with a Max wedge and I'm very rusty about the exact methodology meeded....
BOB RENTON
 

MIKESPOLARA

Well-Known Member
Local time
1:32 PM
Joined
Jun 16, 2021
Messages
706
Reaction score
731
Location
CALIF
you need to do that to have it idle and run it’s best. You can try your beast then get a unisyn and it will be a big improvement.

Is this a new Car to you? Why not drive it and see how it does warmed up? Advancing the timing will increase the idle speed. Check where The timing is now.

EDIT: Dvorak sold an adapter, you can make one to fit the top of the carb. It is well worth your time to dial in both carbs the same.



Exactly need to drive it etc but just thinking ahead knowing I will ask the same question if needed. Good for me to know even if I don't have to adjust
 

RJRENTON

FBBO Gold Member
FBBO Gold Member
Local time
3:32 PM
Joined
Jul 1, 2015
Messages
2,779
Reaction score
2,665
Location
South Shores area of Decatur, Illinois

Beekeeper

It’s a disease without a cure!
FBBO Gold Member
Local time
3:32 PM
Joined
Jul 4, 2012
Messages
4,160
Reaction score
4,127
Location
Rogersville,TN.
YES.....couldn't think of the name of the device....but I'm not sure if a Unisyn device came in a 4-7/8" diameter to fit the 3447-S air horn or the 5-1/4" diameter of the 3705-S air horn. Its been years since I've fooled around with a Max wedge and I'm very rusty about the exact methodology meeded....
BOB RENTON

They don’t come in the sizes to fit the bigger carbs. Get a plastic carb hat and modify it accordingly
 
Top