General Category > Quadrajet Carb Talk and Tips

Drag car running 17056240 carb. but i have a issue

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Mr.Pontiac:
This carb. has gotten me steady 11.90,s and comes on like a animal, no hesitation or bog i am running no power piston no primary rods and using 65 jets. Main air bleed in air horn .070 running .135 needle and seat. Pulled idle tubes set them at .038 idle down at .052. Problem is i have no control at both air and fuel mixture screws. Should i open holes behind them to say .080?? or is it something else causing my issues,

77cruiser:
How much vacuum do you have at idle?

qjetsrule:
Where is your throttle blade in relation to the transfer slot. With a big cam you may be idling off the main circuit. Is there fuel dripping out of the primary nozzles when idling? To check for proper idle/transfer throttle blade position it requires removing the carb and looking from underneath. If too much transfer slot is exposed you may have to increase bypass air or maybe increase discharge hole diameter as you suggested.

Mr.Pontiac:
Removed base plate last nite, Both idle mixture screw holes and Bypass are sitting at .104

Mr.Pontiac:
Forgot to mention in last reply, at .050 Duration is 242 on exhaust 236 on intake

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