Topic: quadraget CFM on a L48 Motor
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
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Lifetime MemberEquinunk, PA - USA
Joined: 10/31/2007
Posts: 2465
Vette(s): 1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.
Most of them are in the 600-650 range.
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Overland Park, KS - USA
Joined: 7/9/2003
Posts: 914
Vette(s): 1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.
2023 Accelerate Yellow HTC Stingray
Here's some info:
https://www.youtube.com/watch?v=xuqz5Bs96Tw
https://en.wikipedia.org/wiki/Quadrajet
Some reading:
https://www.motorstate.com/Quadrajet.htm
Hope this helps. Basically the Q-jet is a variable CFM carb up to the maximum of either 750 or 800. The 800s are fairly rare.
|UPDATED|7/15/2017 6:42:26 PM (AZT)|/UPDATED|
https://www.youtube.com/watch?v=xuqz5Bs96Tw
https://en.wikipedia.org/wiki/Quadrajet
Some reading:
https://www.motorstate.com/Quadrajet.htm
Hope this helps. Basically the Q-jet is a variable CFM carb up to the maximum of either 750 or 800. The 800s are fairly rare.
|UPDATED|7/15/2017 6:42:26 PM (AZT)|/UPDATED|
1973 L-82 4 spd
thanks for the information, I am in the process of rebuilding mine and am not having much luck right now. seems to be an issue with the power valve because when I adjust the mixture screws not much happens.
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Overland Park, KS - USA
Joined: 7/9/2003
Posts: 914
Vette(s): 1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.
2023 Accelerate Yellow HTC Stingray
There's a couple of good books on Qjets, one by HP books and the other by Cliff Ruggles.
At idle the power valve should be down unless there's a vacuum problem. A good cleanup and rebuild will probably take care of the problem unless there's a vacuum leak somewhere else. It's surprising (at least to me) how little air an engine uses at idle so a minor leak can have a large effect..
At idle the power valve should be down unless there's a vacuum problem. A good cleanup and rebuild will probably take care of the problem unless there's a vacuum leak somewhere else. It's surprising (at least to me) how little air an engine uses at idle so a minor leak can have a large effect..
1973 L-82 4 spd
Make sure your primary throttle shaft doesn't have any up, down, front to rear play in it. This will be a source of a vacuum leak. If it does, there is a bushing kit out there that will fix that problem. Very common with Q-jets, especially 4 speed car because of being on and off the gas pedal between shifts.
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Born 8/1981
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Overland Park, KS - USA
Joined: 7/9/2003
Posts: 914
Vette(s): 1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.
2023 Accelerate Yellow HTC Stingray
Good point. But it happens to Holleys also. I bushed my friend's '66 427 Holley. Really helped. The kit came w/ a reamer and bushings.
1973 L-82 4 spd
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
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