Exhaust Backfiring

Rays69Cuda said

Didn't think about that. The cooler the fuel the more dens the richer the charge. Where the filter was before was right over the Vale cover. I also made a heat shield for under the carb. With my spacer and the shield the fuel bowls are now 20° cooler than my intake. That will make things richer. Right?

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The longer the fuel line, the more potential for it to absorb heat... I would make the line go from the fuel pump to the carb, with the filter somewhere between the fuel pump and the carb, not before the pump...

If you are worried about heat, then use a plastic fuel filter vs the metal "tin can" one... I also run the 5/16" thick carb gasket to help keep the fuel from boiling...

I think your comment on the cooler the fuel, the more dense the charge, is slightly off... The cooler the Air charge, the denser the mixture... I would think that a little heat in the fuel will help atomize/vaporize it in the air (as long as you don't get into vapor lock)... Since the air is roughly 14:1 ratio, the air temp is more of an influence on the incoming charge temp than the fuel...