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Author Topic:   Carb misery!!!!!!!!!
racerman707
Dirt Freak

Total posts: 374
posted April 28, 2005 08:15 AM  
I run a 5200 holley that leans out bad at high rpm. Anybody got any experience with these? Put all the jets, emulsion tubes, air correctors, power valve in it that we've always ran. This thing detonated so bad the spark was grounding to the aluminum specs melted to the pistons and costed us a race! I put huge jets in this thing but can't get any color on the plugs. Has no vacuum leaks anywhere, timing is right. Any help apreciated.

KPLugnut
Dirt Forum Champ
Total posts: 1019
posted April 28, 2005 08:24 AM  
Fuel line restriction or fuel pump problem at higher rpms, perhaps? I'd be looking at the fuel supply first, if you are sure you've eliminated internal carb calibration as the culprit.
We've done many 5200's, and there's usually an obvious problem if you're starving it that much at higher rpms.

Hope that helps,
KP

racerman707
Dirt Freak

Total posts: 374
posted April 28, 2005 09:26 AM  
We have a very radical cam in this thing and the carb would load up at idle so we took a suggestion and installed a pressure regulator and put it on 5 pounds. It would bust out down the straights after that so we took the reg back off and have been living with the idle problem. Could the fuel line be collapsing? We have regular 3/8 fuel line on it. Could the carb be cracked somewhere in the main body that we can't see? Someone drilled and tapped it for holley jets also.? We have never been able to read the plugs with this carb. They just have no color.

31 Bowtie
Dirt Newbie

Total posts: 3
posted April 30, 2005 02:49 PM  
do you run on a tight or banked track? may have to bend the floats at an angle if you go fast into the corner the fuel will slosh to one side of the bowl holding the float up blocking and fuel coming into carb leaning it out.

racerman707
Dirt Freak

Total posts: 374
posted May 01, 2005 06:54 AM  
Took KPs advice and checked for a restriction. It seems while we were working on the car over the winter SOMEBODY put a solid cap on the vent on the fuel cell and forgot about it! I haven't ran it since but we went ahead and changed the filter and all the fuel lines and put the filter back on the cell. I hope that's got it. Thanks a bushel.

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