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post #1 of (permalink) Old 12-16-2002, 06:57 PM Thread Starter
 
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Backfire Problem Help Needed

Anybody know how to eliminate back firing? It occurs when I take my foot of the gas after fully accelerating. I assume maybe it is a carb. adjustment of some sort.
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post #2 of (permalink) Old 12-16-2002, 07:48 PM
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Re: Backfire Problem Help Needed

Check to see if you have an exhaust leak , especially at the collector on your Thorley . The fuel left over when you let off the throttle gets a whiff of oxygen through any exhaust leak ahead of the muffler , that O2 will cause the hot gasses to ignite . Sometimes pretty violently . I remember the early to mid 70's Chevy Nova's that had that wonderful smog pump . If the bypass valve got bad , it would throw all this cool fresh air into the exhaust during deceleration , and blow the muffler clean off the car . Some of them did it with huge flames under the rear of the car . Pretty cool , in a way.....
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post #3 of (permalink) Old 12-16-2002, 08:52 PM Thread Starter
 
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Re: Backfire Problem Help Needed

Sarge I checked the header. I don't think I have a leak. This is the second motor I have had in the rig and I swapped the Thorley onto it from the first motor. I had the backfire problem with the old motor as well. The only thing that I kept the same is carberator which seem to run well. Any other ideas or suggestions.
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post #4 of (permalink) Old 12-16-2002, 09:05 PM
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Re: Backfire Problem Help Needed

Ok, so no exhaust leaks at all? If so, what carb?
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post #5 of (permalink) Old 12-17-2002, 05:41 AM Thread Starter
 
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Re: Backfire Problem Help Needed

I am running the stock carb. I will take another look to check for exhaust leaks this evening but the Thorley header comes with a decent gasket and doesn't seem to loosen up like some other headers.
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post #6 of (permalink) Old 12-17-2002, 05:59 AM
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Re: Backfire Problem Help Needed

A good way to check for small exhaust leaks is to have some one hold a shop rag tight to the tail pipe,while you listen for the leak.Or use a length of heater hose one end to your ear the other run over all sealing areas of the exhaust.
post #7 of (permalink) Old 12-17-2002, 09:00 AM
 
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Re: Backfire Problem Help Needed

My stock carb does the same thing. ITs the float level or mixture that i think is screwed up on mine. Im not even going to try to adjust it, since I suspect someboday already did and screwed it up royally. I GOT A WEBER 32 for $40 BRAND NEW! SOme CJ7 guy bought it and never installed it, he went with EFI instead. Beat that DEAL [img]images/graemlins/grin.gif[/img]KAMAZUKI
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post #8 of (permalink) Old 12-17-2002, 10:38 AM
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Re: Backfire Problem Help Needed

Is it bad that the zook backfires? Mine rumbles if she's cold and I engine brake from like 5000rpm, I think it sounds cool.
HA! My old exhaust setup would throw a 1' flame out of the side when I had some bad leaks! Super cool!
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