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Post by turnleftdaddy51 on Aug 20, 2014 21:25:39 GMT -6
My car stumbles when coming out of corners. I've had problem all season I run a holly 4412 carb that according to people "in the know" is working perfectly. Halfway through season had a metering block installed on carb seemed like it didn't change things. Install a cooling can and also run gas that is about 40 degrees F. when race starts. pickup in tank has been changed, run 3/8 fuel line have insulated fuel lines, fuel pump has been changed. Really irritating anyone have ideas. I drive it into corner left off gas suddenly and get back into gas about halfway then it stumbles, stumbles meaning it hesitates that kicks in hesitates kicks in several times picks up when im straight again don't know if that means anything, Being straight again I mean. PLEASE HELP!! I had this problem with another carb earlier in season but will try another one this weekend.
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Post by flipflopoo1oo on Aug 20, 2014 22:16:06 GMT -6
We had a lot of tank pick-up problems with cracked hoses or steel tubing getting cracked, loose, or fittings! A racing float if not in place or float levels! Is it loading up or poping??? Timing too low for fuel can load it too! A bad power-valve or just wrong per vacuum or jetting! I never run a power valve! Timing increase if not getting to 38 max! Read the plugs! See if its all or few threads with oil! The inside should always be white!
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Post by flipflopoo1oo on Aug 20, 2014 22:46:48 GMT -6
Run a search! Lots of info related in the past post!
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Deleted
Deleted Member
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Post by Deleted on Aug 21, 2014 8:00:38 GMT -6
What power valve is in the carb? And do you know your fuel pressure? Could be fuel pump related since happening under load.
Dave
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Post by bustedknuckle on Aug 29, 2014 15:01:39 GMT -6
Check the float level. set it a bit on the high side
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Post by floppyfoot on Sept 4, 2014 6:58:06 GMT -6
What pit crew said. Also we had a problem a lot like that and the vent holes behind the squirters were stopped up.
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Post by street16 on Sept 11, 2014 10:06:27 GMT -6
I've been fighting a similar problem. And mine just kept getting worse. After replacing the carb and the ignition system, I decided to pull the motor and start from the gound up. As soon as I pulled the timing chain cover, I knew I had found a problem (I wont call it "the problem" until I get to test it on the track). The timing chain had stretched so much that it retarded the cam 3.5 degrees.
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Post by turnleftdaddy51 on Sept 11, 2014 20:02:21 GMT -6
Thanks guys you were a great help> I found two problems, 1 the pick up in the tank is cut diagonally and was up against bottom of tank when under load the pickup got suck againt tank cutting off fuel. After fixing that was still stumbling coming out of corner changed carb. and came in second was on the leaders tail.
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Post by floppyfoot on Sept 12, 2014 7:34:03 GMT -6
Since we cleaned the vent holes, replaced the timing chain, there were pieces of timing chain on the drain plug magnet, replace the dist. gear, it was worn bad, have started 10th and finished 3rd up beside the 2nd place car's door, and started 4th the next week and won by a straightaway.
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