Ok so I've heard multiple reasons for an engine backfiring. I'm backfiring outta the mufflers at about 2500 rpms 2nd gear. I've cleaned the fuel filter, set the timing about 8*R, I'm beginning to think its my A/F ratio but I don't have a gauge. The plugs are new so they haven't had enough burned to show any signs of Rich/Lean. Engine ran rich before i changed the plugs. I've adjusted the fuel on the carb, although that could be my problem I'd just like some input before I go around messing with my A/F mixture.

 

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Thanks Scott. And yes I was mistaken when i stated 8*R I meant 8*BTDC. Also, I'm not sure if this will affect any input but the engine has a mild cam. Not sure if the cam was degreed when installed came from a P/O who had it in a '33 Ford. Pretty Crazy.


Is there any reason to worry about backfiring? I've heard that it can blow holes in your mufflers but I'm not sure if thats just a bogus story?

 

my car was back firing for a long time when i was running insanely lean. didnt happen with my foot in the throttle but as soon as i let off to coast it would pop pop popop, turns out i was lean as hell

 

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