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 smallest lower idle air bleed you've ever seen ? 
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Joined: Tue May 06, 2014 5:34 pm
Posts: 45
I'm not sure where I read it but I'm pretty sure I read somewhere about Chrysler Quadrajets having very small lower idle air bleeds, somewhere around .038 if my memory is right.

Could anyone confirm this ? I've tried Tuner's recipes using smaller lower idle air bleeds (.062") and it really does improve economy (everything else tuned accordingly). I was wondering if going much smaller than that could improve even more.

Tue Jul 26, 2016 9:03 pm
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Joined: Fri Feb 08, 2013 2:37 pm
Posts: 1744
Good question, could be worth a try. I dug out a Mopar QJet and find I already shrunk it to .062". I think it was .073" or .076". I just checked a virgin Mopar unit and it is .073".

I recently measured an .039" upper IAB in a QJet I can't identify because it has been glass beaded to death and the number ground off to make a "custom marine carb" out of it. Pretty red color though. The secondary main jets, the little stainless steel discs that should be .135" ID, were glass beaded so thoroughly they were larger than .144". From a name-brand mail-order outfit too.

Tue Aug 02, 2016 10:07 pm

Joined: Tue May 06, 2014 5:34 pm
Posts: 45
Well I'll try and let you guys know.

Wed Aug 03, 2016 6:29 am
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