AVS2 compared to Street Demon?

I'm able to find 90 octane non-ethanol in a few places around me, and that's what I always run. This vapor locking is so consistent, and the AFR gauge tattles, and makes things obvious. I don't know how anyone trying to blast down the quarter mile can live without an AFR gauge. Anywho…

It was 6 to 7 seconds it would run out of fuel. Now it is more like 7 to 9 seconds (with the tape heat shield). But, on the line, the fuel in the bowl is fine. It leaves the line nice, full power, at least at partial throttle (because I have skinny 14" tires). AFR gauge shows perfect AFR. So it is not boiling in the carb. Once at full throttle the power is awesome. Until it falls on its face and the AFR gauge slams up to 20+, at which point I back out of it. It is heating the fuel line near the right header while I'm gently power braking it on the line. Then the mechanical fuel pump cavitates from boiling fuel and fails to replenish the fuel in the bowl. The bowls drain down consistently and when there's not enough fuel, it falls on it's face. On the street, it never vapor locks. An 1/8 of a mile track it would be fine.

I'm hoping that raising the floats extends the time out to where it would run out of fuel. And that maybe the fuel pump could still spit enough fuel to keep it going to the end of the track … maybe airflow (moving down the track) would cool things off and the fuel pump would start becoming more effective. I doubt it's going to work, but I'm resisting the electric pump.


7milesout