Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Does this sound lean?
Marx3:
Hi, my buddy has a 68 Corvette with a H.P. 327, all stock. He bought a brand new Qjet from some company that sells Corvette-stuff only. I am not sure about the quality.
Problem is that it rattle at medium/heavy/WOT throttle... Total timing is 32, so that should not be the problem. I thought maybe it was lean, so I took the carb apart to measure everything...
SO! does this sound lean for an old 327...
prim. jets .068
rods .033
idle tubes .038
down ch. .052
lower air bl. .060
upper air bl. .090
Sec. rods CH/.055
POE well restr. .030
POE restr. .040
tube restr. .023
M hanger
Some of the measurements are appr. or very close, as I did not have all the drillbit-sizes.
Cliff Ruggles:
There are no "brand new" quadrajets that I know of, it would probably be a commercially "remanufactured" unit.
You list two airbleed sizes, are those idle or the main airbleeds?
If those are idle airbleed sizes, what are the main airbleed sizes?
What is the carburetor part number?....Cliff
Marx3:
sorry for the delay, been busy during the weekend.
I guess I was a little fast, when typing the numbers the first time, here's the second try :-)
the lower idle air bleeds: .062
the upper idle air bleeds: .090
main air bleeds in airhorn: .052
main air bleeds in body: .114
carb number is 7043208
You are propably right that it is a remanufactured model of some sort. The body just looks different than other "original" Qjets I have ever seen. And the baseplate don't look like an "original" either. It looks kind of cheap, you know :-) But I am no expert!
Cliff Ruggles:
Those main airbleeds sizes are not "stock" for that model, it's been recalibrated. The .033" rods are also a miss-match for those jets. Probably a "generic" calibration they came up with.
Has the APT system been disabled?.....Cliff
Marx3:
The APT has never been there... No hole for it in the body, no APT at all.
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