Question with ground+Carb
Thread Starter
Burning Brakes
Joined: Jun 2008
Posts: 827
Likes: 0
From: Salem Ohio
Question with ground+Carb
I have a question on what this ground strap is to?
Also, the butterfly on the rear of the carb, can you adjust it, because my car really starts to move when you let off the break. Or does the choke pull off control this?
Also, the butterfly on the rear of the carb, can you adjust it, because my car really starts to move when you let off the break. Or does the choke pull off control this?
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Yeah. I'm trying to figure out how to 'ground' fiberglass. If the bolt/nut going thru there is connected to the [metal] birdcage, that could be the primary interior ground. Right now, that strap is just shorting out a couple of the blower speed resistors. 
Racer
Joined: Feb 2007
Posts: 271
Likes: 25
From: Buena Vista Colorado
...that could be the primary interior ground.
Also, the butterfly on the rear of the carb, can you adjust it, because my car really starts to move when you let off the break. Or does the choke pull off control this?
Check this by setting the choke closed on a cold engine. The tip of a lever in the choke linkage assembly should rotate toward the rear of the carb, and that tip should be positioned against the end of the pin in the end of secondary throttle shaft. As the choke opens, the lever moves away from the pin. That allows the secondaries to open when the motor is warmed up.
Last edited by 78IndyPace; Jul 20, 2011 at 03:36 PM. Reason: Added info on Quadrajet secondaries
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Thread Starter
Burning Brakes
Joined: Jun 2008
Posts: 827
Likes: 0
From: Salem Ohio
It seems as if the the choke does nothing at all. Also, its the rear front flap I think, not the rear. The smaller one that stays open. If i push it down, it idles a little rougher. Anyway, we adjusted idle speed and it helps.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
The "rear flap" is the secondary air valve. Operates solely on engine vacuum, but some carbs have a lockout link so if the choke is on it can't open.
Racer
Joined: Feb 2007
Posts: 271
Likes: 25
From: Buena Vista Colorado
It seems as if the the choke does nothing at all. Also, its the rear front flap I think, not the rear. The smaller one that stays open. If i push it down, it idles a little rougher.
Cliff Ruggles' book on Quadrajets is a truly excellent reference with lots of close-up photos showing choke linkages, air flaps, choke flaps, throttle butterflys, and everything about these carbs.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
The rear front flap? Dude, are you from Mars or something?
You posted on this forum, so obviously you have access to the Internet. If you do a Google search for "Quadrajet tuning" or "Q-jet tuning"you will find untold riches! A plethora, a veritable cornacopia of articles on how to tune it, how to clean it, re-build it, take it apart, put it together, modify it, whatever you want to do to it.
I'm not trying to make you feel bad, but really, you don't even have the vocabulary to describe your problem, or even to understand the answers. I mean, c'mon, how hard is it to look at a picture of a carburetor, with arrows that point to things on it, telling you what they are and what they do, so you don't have to come on here and embarrass yourself by talking about "rear front flaps"? Here are some links to some really great articles on Quadrajet carbs, you have a bit of a learning curve in front of you, but just a little reading will have you able to intelligently discuss whatever you want to about your carb and how it works. Good luck!!
Scott
http://www.classictrucks.com/tech/09.../photo_01.html
http://www.carcraft.com/howto/57178/index.html
http://carburetor.fateback.com/Roche...et_Tuning.html
http://www.florida4x4.com/tech/quadrajet/index.php
http://www.mako.com.au/buick/html/qjet_tips.htm
http://vetteworks.tripod.com/qjet.htm