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Collective wisdom needed...Misfire at hi revs ...fuel starvation?

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14GPDJENGINEERING Avatar
Silver Spring, MD, USA   USA
Vacuum leak at manifold or carb interface?



Dennis smiling smiley

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1964Spitfire Tim P
Santa Clara, CA, USA   USA
Had a similar problem many years ago on a Jensen Healey. Only missed at WOT and high RPMs.

Changed out all ignition components - no help.
Rebuilt the carbs - no help.

Eventually figured out it was the fuel pump. It was one of those Facet cube style pumps that had worked flawlessly for many years. But when it started to fail it just couldn't deliver the flow or pressure required for WOT @ 6000+ RPMs.

So what are you running for a fuel pump, and do you have a regulator?

Lizzard d id
san jose, CA, USA   USA
In reply to # 1532750 by SpitnSawdust Am I right in thinking my previous attempt to sort it by lowering float valves with washers might be causing fuel starvation at high revs (>4k on a tc2500 engine)?
Please do adjust the float bowl valves / floats . You really don't want or need lean . If you richen up the mixture that way doesn't the high speed misfire / backfire change ?

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