09-06-2021, 11:27 AM
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Senior Club Cobra Member
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Join Date: Mar 2000
Location: St. Augustine,
FL
Cobra Make, Engine: E-M / Power Performance / 521 stroker / Holley HP EFI
Posts: 1,935
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Not Ranked
SB,
Been down the "try to make the carb stop percolating" rabbit hole.
Insulators, heat shields, return lines for continuous fuel recirculation, drop base filters (made it worse by shrouding the float bowls), you name it.
Nothing worked.
Depending on the chemical makeup, gasoline can boil at as low as 100 degrees F. The petroleum companies seem to like to hide their facts, so we may never know exactly. At elevated altitudes the problem is aggravated.
What I'm certain of is that it boils at a relatively low temperature; way lower than the leaded gasoline that was standard when these carbureted cars were originally produced. Even then they had some problems...
I've driven one of my carbureted cars with the hood and air filter removed. After it warmed up, the geysers coming out of the float bowl vents were an impressive sight. Right before they made tight u-turns and got sucked into the venturis - then everything shut off until the gas could evaporate. All's well now with EFI.
Just saying...
Tom
__________________
Wells's law of engine size: If it matters what gear you're in, the engine's too small!
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