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Eric Satrum
 Post subject: Quadrajet?
PostPosted: Thu Aug 09, 2001 8:39 am 
Has anyone ever tried to put a Quadrajet on a /6? Are these just too big, or is there any other obvious reason not to try this?

eric.satrum@mail.utexas.edu
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Gary
 Post subject: Re: Quadrajet?
PostPosted: Thu Aug 09, 2001 9:58 am 
Please excuse my pontification, but Quadrajets belong on GM cars. Of all carbs ever built, those are THE most frustrating to work on, and to saddle a slant 6 with one borders on immoral!
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Mike P
PostPosted: Thu Aug 09, 2001 10:47 am 


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dschumers
 Post subject: Re: Quadrajet?
PostPosted: Thu Aug 09, 2001 2:56 pm 
Quote:
: Has anyone ever tried to put a Quadrajet on a
: /6? Are these just too big, or is there any
: other obvious reason not to try this?


I used to race a 455 Skylark and the QJ was the most reliable carb you could ask for. Buick actually used them on V-6's in the '70's and early 80's. They had the secondary air doors "pinned" so they would only open about halfway. The QJ came in either a 735 cfm or a 780 cfm (different size primaries), so yes, unless you find a "pinned" one they would be way too big for a Slant. Dennis


aschumers@aol.com
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Eric Satrum
 Post subject: Re: Quadrajet?
PostPosted: Fri Aug 10, 2001 5:51 am 
Thanks for the information, Dennis! I kind of figured it would be too big. I guess I'll look at other options.

-Eric


eric.satrum@mail.utexas.edu
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wtzupdoc
 Post subject: Re: Quadrajet?
PostPosted: Fri Aug 10, 2001 7:11 am 
Quote:
: I used to race a 455 Skylark and the QJ was the
: most reliable carb you could ask for. Buick
: actually used them on V-6's in the '70's and
: early 80's. They had the secondary air doors
: "pinned" so they would only open
: about halfway. The QJ came in either a 735
: cfm or a 780 cfm (different size primaries),
: so yes, unless you find a "pinned"
: one they would be way too big for a Slant.
: Dennis

Hey Dennis , Why not just fabricate a stop for the secondaries? i have several quadrajets laying around, I even put a 350 in a S-10 about 15 years ago.. dang carb never gave me any probs but i know there taboo with mopar ppl cause they replaced the afb's


wtzupdoc@pmcol.com
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kesteb
 Post subject: Re: Quadrajet?
PostPosted: Fri Aug 10, 2001 7:33 am 
Quote:
: Please excuse my pontification, but Quadrajets
: belong on GM cars. Of all carbs ever built,
: those are THE most frustrating to work on,
: and to saddle a slant 6 with one borders on
: immoral!


Actually they did come on the small blocks. Chrysler used them after Carter discontinued the thermoquad. Edelbrock makes new replacement versions and a couple of HP ones. I think they would be ideal in a drawthru turbo application. Just like GM did...



klesteb@aol.com
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Smith
PostPosted: Fri Aug 10, 2001 7:36 am 
Mother Mopar used millions of Carter's Quadrajet, the Thermoquad, in the 70's and 80's on everything from hi-po 440's to 318 smog motors. I ran a 76 Duster 360 and a 78 Plymouth Kit Car 360 with these carbs, and they ran great, if you know what to change and can get the rods and jets.

I have one that we may try to use on the new motor if the 500 AFB is not enough. Already have the adapter plate for the Clifford intake, and with the spring loaded air door that is adjustable, the carb can be tricked into thinking it is really only a 400, 500, 600 cfm or whatever. The primary's are very small, and if the secondary's don't open too fast or too far, a well-built slant should be able to take it.

The old DC manuals were full of stuff on the Thermoquad, and a lot of guys ran them on 340/360 motors in the mid to late 70's.


sgw041454@aol.com
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Gary
 Post subject: Re: Quadrajet?
PostPosted: Fri Aug 10, 2001 9:15 am 
Yep, that's where I had most of my limited experience with them. I even hear the GM guys refer to them as "Rotten-chesters". Compared to a Carter or Holley, they are a pain to work on, and always need to be worked on. Like I said, they belong on GM cars!
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GTS225
 Post subject: Re: Quadrajet?
PostPosted: Fri Aug 10, 2001 10:20 am 
Now, now, guys.......we're getting a bit nasty about the Q-jet. Don't get me wrong, as I'm a bit of a purist, myself, but there really is a place for that old spread-bore Q-jet.
The center-position of the float bowl makes it a pretty good carb for off-roading in a 4X4, as it doesn't flood the venturi's with gas near as badly as others when in an off-camber situation.
It really is a pretty good carb, but it's major problem is that it takes somebody who really knows how to tune them to make them work well, (and I'm not that guy, either)

Roger

GTS225@aol.com
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DusterIdiot
 Post subject: Re: Quadrajet?
PostPosted: Fri Aug 10, 2001 10:51 am 
Quote:
: The center-position of the float bowl makes it
: a pretty good carb for off-roading in a 4X4,
: as it doesn't flood the venturi's with gas
: near as badly as others when in an
: off-camber situation.


I'm with Roger on that one, I've used them in Demo Derbies on 383's and they are sweet compared to Holleys and Carters (more Cheby small blocks stalled out because of side hits and having Holleys on them...)
I do know that Q-jets were OEM for the Diplomat cop cars in certain years, and in the early 70's when Rochester went on Strike, Carter made Q-Jets for a couple of years (look for the badge on the side that says "QuadraJet made by Carter...")

my .02 cents...

-DusterIdiot


res0aus2@verizon.net
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Tim
 Post subject: Re: Quadrajet?
PostPosted: Fri Aug 10, 2001 2:56 pm 
short of fuel injection the QJet is one of the best offroad carbs.
Quote:
:
: The center-position of the float bowl makes it
: a pretty good carb for off-roading in a 4X4,
: as it doesn't flood the venturi's with gas
: near as badly as others when in an
: off-camber situation.


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dschumers
PostPosted: Fri Aug 10, 2001 3:00 pm 
Quote:
: Mother Mopar used millions of Carter's
: Quadrajet, the Thermoquad, in the 70's and
: 80's on everything from hi-po 440's to 318
: smog motors. I ran a 76 Duster 360 and a 78
: Plymouth Kit Car 360 with these carbs, and
: they ran great, if you know what to change
: and can get the rods and jets.
:
: I have one that we may try to use on the new
: motor if the 500 AFB is not enough. Already
: have the adapter plate for the Clifford
: intake, and with the spring loaded air door
: that is adjustable, the carb can be tricked
: into thinking it is really only a 400, 500,
: 600 cfm or whatever. The primary's are very
: small, and if the secondary's don't open too
: fast or too far, a well-built slant should
: be able to take it.
:
: The old DC manuals were full of stuff on the
: Thermoquad, and a lot of guys ran them on
: 340/360 motors in the mid to late 70's.


I forgot to mention, Ma replaced the Thermoquad with the Quadrajet in the '80's. I have seen them on police motors and trucks. I used to run a Thermo on a 340 Demon. For ease of tuning, I'll take a QJ anyday! (Just my opinion)


aschumers@aol.com
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dschumers
PostPosted: Sat Aug 11, 2001 4:35 am 
The best thing about QJ's is that anybody with a third grade education and 4 dollars worth of K-Mart tools can make one work very well. The only downside is that the float bowl capacity is a little small and on motors that require a lot of fuel they tend to lean out in high gear. No need to worry about that on a Slant though.

aschumers@aol.com
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DusterIdiot
PostPosted: Sat Aug 11, 2001 5:07 am 
Yes, but an electric fuel pump, and running 3/8" fuel line to the carb like GM does, solves that problem. The most common mistake is the guys who just plug and play the QJ with 5/16" fuel line and a standard mechanical fuel pump...
Quote:
:
: The only downside is that the float bowl
: capacity is a little small and on motors
: that require a lot of fuel they tend to lean
: out in high gear. No need to worry about
: that on a Slant though.



res0aus2@verizon.net
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