Cliff's Quadrajet Parts and Rebuild Kits
Quadrajet Problem Solving => Dialing in your rebuilt Quadrajet carburetor => Topic started by: beertracker on November 13, 2014, 08:24:36 AM
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Can some one tell me how to remove the brass primary nozzles on a 17057274 qjet?
bt
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I'm curious are you talking about the ones in the venturi?if so I've never taken them out. but if i had to id screw a screw in them and pull them like the idle tubes. not to sure if a guy would be able to reuse them or not. fwiw
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Yes, the ones in the venturi. Good point about re-using them. bt
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I'm pretty sure I saw somewhere a method for removing them. It was explained by a Pontiac guy, I'll try to find it and give you the link. May I ask why you want to remove them ? Frank.
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It's a remove the nozzles if I have to situation & I hope I don't have to. The original problem was fuel dripping from the primary nozzles with all throttle blades fully closed at idle. I tried changes to idle tubes, down channel restriction & idle bypass air with Cliff's guidance. Then I read some where about tapping the primary nozzles slightly away from venturi to reduce the vacuum signal the nozzle sees. So I tried this but haven't tested it yet.
My concern is if I moved the nozzles too far away from the venturi and have to reposition them back; how do I do this? I hope I don't have to.
bt
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Hey Beertracker, read this thread on the PY forum. I'm sure it will help you. Frank.
http://forums.performanceyears.com/forums/showthread.php?t=433137&highlight=qjet
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Frank, good link thanks for posting. bt
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Hey Beertracker, read this thread on the PY forum. I'm sure it will help you. Frank.
http://forums.performanceyears.com/forums/showthread.php?t=433137&highlight=qjet
Interesting. 8)
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If you guys take some time to read posts and threads by this guy, you'll see that he's really something.
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I moved the nozzles slightly away from the venturi and retested and no changes it still drips fuel. The nozzles won't move any further away from the venturi seems like they are bottomed out.
Time for me to find a new hobby. bt
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The PY thread is pretty "old" information, and several flaws in it.
There are a LOT of different nozzles, none of which are still available anyplace that I know of?
I am probably the only one these days that has a decent supply of them, and I bought them about 3 decades ago.
In the last 11 years since going full time in this industry I have NEVER once had to drive main nozzles in deeper to cure any idle problems.
Idle fuel delivery and bypass air is the key to curing your idle issues. If you can't get good results and everything internally is on par for what you are doing then you've either missed something, miss-matched components, or something fundamentally wrong someplace.
Miss-matched components comes to mind when I read this thread, but without seeing the carb that's just a guess on my part.
I just happen to use the exact same carb number on my own engine, with a .630 lift roller cam it's flawless everywhere, and has been for many years. I've also built several hundred of these units, and not once had an idle issue with one, even with much more radical combinations that the one mentioned on this thread.
Maybe this carb is something I need to see? Most likely, I could sort out the issues with it in less time than it took me to type this.....Cliff
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Cliff, I will send the carb in. bt