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Author
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Topic: Carb spitting fuel under heavy acceleration
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Pierre
Gearhead Posts: 557
From: Near Paris, France
Registered: Apr 2002
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posted 11-25-2003 08:19 AM
   
It will sometime happen under heavy to WOT accelerations (above 3K) and smells like unburned fuel coming back out of the carb (I plugged the breather to verify that). It usually coincides with a noticeable loss of power !!
Some king of missfire ?
(Using all new ignition equipment + MSD6A)
Aside from that engine runs perfect no other complaint
Thank for any input
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adragon8u
Gearhead Posts: 4975
From: Oceano, Ca. member# 2895
Registered: Mar 2003
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posted 11-25-2003 09:36 AM
are the float bowls adjusted?------------------
http://webpages.charter.net/adragon8u/mystang
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Pierre
Gearhead Posts: 557
From: Near Paris, France
Registered: Apr 2002
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posted 11-25-2003 09:44 AM
quote:
Originally posted by adragon8u:
are the float bowls adjusted?
Yes (Holley 600CFM double pumper), I have paid extra caution to the adjustments of the carb & the ignition system.
My own analysis of the problem tells me that this is a slight missfire situation due to some random electrical issue on a wire or interferences with the MSD box trigger wires, bad ground...... But I want to get you guys opinion 
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Moneymaker
Administrator Posts: 26242
From: Lyons, IL, USA
Registered: May 99
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posted 11-25-2003 10:45 AM
If you are suspect of the carb, you may have some float vent sloshing under acceleration Pierre.
Try connecting the vent tubes with a length of 3/8 rubber hose. 6 inches should be plenty and there is no need to clamp it. Take some wire cutters or a razor blade and cut a small slot in the center of the hose at the apex of the hood side.
If slosh over is the problem, this will cure it.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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Pierre
Gearhead Posts: 557
From: Near Paris, France
Registered: Apr 2002
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posted 11-25-2003 11:05 AM
quote:
Originally posted by Moneymaker:
If you are suspect of the carb, you may have some float vent sloshing under acceleration Pierre.
Try connecting the vent tubes with a length of 3/8 rubber hose. 6 inches should be plenty and there is no need to clamp it. Take some wire cutters or a razor blade and cut a small slot in the center of the hose at the apex of the hood side.
If slosh over is the problem, this will cure it.
Hey ! Didn't think about that , makes sense though. I will give it a shot
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