Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

66 Buick Q-Jet

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Cliff Ruggles:
71/39 might work.  If you don't want to make that much of a jump, try 73/42....Cliff

Rhett:
Let me see if I've got this straight..

74 Jets and 44 Rods give me a total area of .00278031

The 73/42 Combo would give me .00279994 - Bigger for more cruise fuel...

Could the same thing be accomplished with leaving the 74 jets and going to a 43 rod for .0028464? More cruise fuel, but I did try that once and it didnt seem as crisp under part throttle.. is that too much cruise fuel for this car? (stock 401, auto, no cam, 2.5 exhaust)

By that yardstick, the 71/39 combo give me .0027646 - seems to be a step in the wrong direction......??

Thanks, Rhett

Cliff Ruggles:
The mods I suggested were in combination with reducing the fuel being supplied by the idle system.  The idle system feeds the engine off idle and thru transition via the transfer slots and lower idle airbleeds......Cliff

Rhett:
So to reduce the idle fuel, I'd have to drive in new ICR restrictions and resize them to .046 or so, correct?

If I'm hearing you right, you suspect the carb is too rich at off idle and cruise??

Cliff Ruggles:
Correct.  To much idle fuel to the mixture screws and transfer slots can make the carb rich at part throttle....Cliff

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