Dual Carbs and Stiff Gas Pedal
#1446905
06/03/13 02:29 PM
06/03/13 02:29 PM
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Joined: Feb 2003
Posts: 374 Wisconsin
Mopar_Mudder
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This is my first time having dual carbs, have driven triples though. Any way I have a return spring on each carb and everything is nice and smooth when it isn't running. But when it is running it take alot of pedal pressure to get the carbs off idle, this makes taking off nice and easy difficult. Once you get off idle it is smooth again. Seems like it is trying to break the suction of the engine trying to pull the plates shut or something. Never ran into this before, any ideas?
Last edited by Mopar_Mudder; 06/03/13 02:35 PM.
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Re: Dual Carbs and Stiff Gas Pedal
[Re: mickm]
#1446911
06/03/13 03:15 PM
06/03/13 03:15 PM
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Joined: Aug 2003
Posts: 12,291 Kent, Wa
340SHORTY
Truck Nut
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Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
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Raise the mounting point of your throttle cable. Some Mopars have a little 90 degree bracket that will raise it by about 3/4" to 1". You need springs capable of closing the butterflys not barn doors..
I am truckless..
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Re: Dual Carbs and Stiff Gas Pedal
[Re: Mopar_Mudder]
#1446913
06/03/13 04:28 PM
06/03/13 04:28 PM
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Anonymous
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I would temporarily remove just the green spring and see what happens. Problem might be the carb butterflies sticking, not too much spring pressure.
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Re: Dual Carbs and Stiff Gas Pedal
[Re: JohnRR]
#1446916
06/03/13 05:11 PM
06/03/13 05:11 PM
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Joined: Feb 2003
Posts: 374 Wisconsin
Mopar_Mudder
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Quote:
What the 2 guys above me said , you are pulling on 2 carbs at once . pull the spring off the front carb and see how much that lightens it up.Plus opening both carbs at once is not going to help the taking off easy part.
Are those carbs 650's or 800's ?
They are 1406's which are 600cfm I believe?
They came set-up with a 1:1 ratio from the engine builder so I left it alone and didn't want to mess with retuning it for pregressive.
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Re: Dual Carbs and Stiff Gas Pedal
[Re: mickm]
#1446917
06/03/13 05:14 PM
06/03/13 05:14 PM
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Joined: Feb 2003
Posts: 374 Wisconsin
Mopar_Mudder
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Quote:
Quote:
I will mess with the springs and see what I can do. Just odd how much difference their is from not running to running. It is not a heat issue because you can tell it right away when you start it up cold.
i'm not sure what you mean by this, can you elaborate?
When it is not running the trottle pedal is real easy to move and start opening the carbs. When it is running the force on the pedal is much greater to start opening the carbs. It is bizzar, maybe I am just lossing it
I will try removing a spring. Just like the idea of two springs, plus must race events require dual springs.
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Re: Dual Carbs and Stiff Gas Pedal
[Re: JohnRR]
#1446919
06/03/13 05:21 PM
06/03/13 05:21 PM
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Joined: Feb 2003
Posts: 374 Wisconsin
Mopar_Mudder
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Quote:
Interesting if they are 1406's , they have the Thunder AVS tops , 1406's are performer series carbs.
Is the intake stock or Vanke modded ?
Did you ask the builder why he set them up 1:1 ? is it stock cubes or a stroker ?
It is a 472 with the Mopar #P5153737 intake. Now I am taking the carb based on what he sent me in an e-mail that he was going to use. I never actually looked for numbers on the carbs themselves.
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Re: Dual Carbs and Stiff Gas Pedal
[Re: Mopar_Mudder]
#1446922
06/03/13 07:03 PM
06/03/13 07:03 PM
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Anonymous
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Quote:
I will try removing a spring. Just like the idea of two springs, plus must race events require dual springs.
My suggestion was just to remove one of the springs temporarily to see if reducing spring tension solves your problem. Problem may be something else entirely. Not sure what, but maybe the linkage connecting the two carbs is sticking a bit from the vibration when the motor's running, but not when it's not. ?? I know it only took a tiny burr on the connector linkage on my Hemi to cause a problem.
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