Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

11.60, et`s but missing thru traps

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Mr.Pontiac:
Only thing I see at carb. Is the filler cup on left side was not there, my fault for sure. Is that slowing me down, I dought it.

Cliff Ruggles:
The FIRST thing to do is to install a larger .145" fuel inlet seat, no other changes and see if it helps?

If the fuel system isn't keeping the bowl full the larger seat will let you know on the next run.

Not sure why you'd "lock out" the timing.  That's pretty "old school" and a good way too loose a race if you don't have adequate time between round to cool things down.

I've seen folks try to restart their engine in later rounds in the staging lanes and kill the starter/battery with "locked out" timing and it's difficult if not near impossible to fire a compressed mixture that early in a really hot engine.  I've also seen them "kick back" and break the nose right off the starter or take out a hunk of flywheel teeth in extreme cases.  So tread softly in that area.

Anyhow, if it's not "breaking up" in 1st and 2nd it's probably not ignition or valve spring related.

Go with a larger fuel inlet seat and look at fuel delivery first.......then move on from there.

11.60's is doing getting it done pretty good but you should be running a LOT faster than 105mph thru the traps.  That's more like low 13's for MPH, not mid to high 11's........FWIW.......Cliff

Mr.Pontiac:
Following your book specs, just drilled out my .135 to .140, left hand corner of carb. Is a filler black cup, I call it that, it was not inside carb ( my fault) installed one , I see fuel in the void, maybe that’s where my issue is. Switched from G hanger to L also.

Cliff Ruggles:
The filler block has NOTHING to do with WOT drag racing performance.

At most I've had a few complaints from folks who claim leaving it out will cause flooding with hard braking.

I brake pretty hard with my car at the track on occasion, no filler block has ever been used and it's FLAWLESS.

Move up to a .145" or even .149" seat and see if you pick up some MPH or help the WOT issues at high RPM's.

They still could be engine related (valve springs), so if things aren't getting better and you've ruled out ignition, fuel delivery, etc, don't cave in a piston or bend a valve continuing to find your issue!.........

tayto:
is the filler block the round thing goes where the mixture control solenoid is on the CCC units? or the thing that goes above the float?

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