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Author Topic:   breaking up
leftturn73
Dirt Roller

Total posts: 25
posted July 05, 2002 12:26 AM
I nomally run a 1/4 mile track with a simple 355 and at 750 alcohol carb. I am having a problem with the motor breaking up just before I lift. I have noticed when I run at longer tracks the breaking up starts earlier (in reference to when I lift). I was checking my carb and noticed when I rev. it up alcohol comes up the rear vent tube. The bowl level is just below the site hole. Not sure if my problem is with carb but I do no fuel should not be coming up the vent tube. Only other thing I was thinking is the came is small and maybe I'm floating the valves because my RPM range is right at the high end spec. Any thougts would be helpful.

powercar821111
Dirt Forum Racer

Total posts: 97
posted July 05, 2002 03:11 PM
We had the same problem with a two-barrel Holley. We just lengthened the vent tube with large-diameter brake line. Otherwise your engine chokes to death.

DodgeBoy76
Dirt Full Roller

Total posts: 73
posted July 05, 2002 04:01 PM
the needle may be sticking in the back bowl. you might possibly try tapping on the adjustment s crew with the handle of a s crew driver or something. just my 2 cents.

CUZZ45
Dirt Roller

Total posts: 11
posted July 05, 2002 05:55 PM
SOUNDS LIKE YOU HAVE TO MUCH FUEL PRESURE IF YOU DON'T RUN A REGULATER YOU NEED TO .IF YOU DO IT MAY NEED ADJ. OR REBUILD THE PRES. AT HIGH RPM IS PUSHING PAST YOUR NEEDLE& SEAT

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