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Re: Quadrojet on a Mopar? [Re: Cudajon] #792216
09/06/10 09:36 AM
09/06/10 09:36 AM
Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
patrick Offline
I Live Here
patrick  Offline
I Live Here

Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
Quote:

I accused the county of doing it, till I found out it came from the dealer that way. They went to the q-jet because they couldn't tune the t-quad. Dumb. The q-jet ran ok but I liked the T-quad better.




no, they couldn't meet emissions with the t-quad....

Last edited by patrick; 09/06/10 09:39 AM.

1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
Re: Quadrojet on a Mopar? [Re: patrick] #792217
09/06/10 11:15 AM
09/06/10 11:15 AM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline
Mr Wizzard
ScottSmith_Harms  Offline
Mr Wizzard

Joined: Jan 2003
Posts: 42,714
Spokane Washington
Quote:

IMO, the Q-Jet is a much more reliable carb than a Thermoquad. Unfortunately, Thermoquads don't age well and can be incredibly tempermental -




Sorry, that's nonsense, they "age" just as well as any other carb, nothing works right if it's been broken, poorly rebuilt or modified, or has been "tuned" by someone lacking the proper knowledge to do so properly. Once adjusted properly they require VERY little adjusting, no more than any other carb design, not tempermental at all.

Quote:

especially the later ones equipped on Lean Burn/Electronic Spark Control engines.




While certainly not the best as a performance carb in stock form, they worked fine in stock applications if all else (non carb related) was in order, however, most the time that wasn't the case.

Re: Quadrojet on a Mopar? [Re: ScottSmith_Harms] #792218
09/20/10 12:51 AM
09/20/10 12:51 AM
Joined: Dec 2003
Posts: 32
New Jersey
G
Greg_Gessler Offline
member
Greg_Gessler  Offline
member
G

Joined: Dec 2003
Posts: 32
New Jersey
While Quadrajet carburetors are mainly known for their use on GM products, they did use them on some Fords, Mopars and even many marine applications.


QuadrajetParts.com Carburetor Parts Superstore Carter, Ford/Motorcraft & Rochester www.QuadrajetParts.com Rebuild kits and Hard to find parts.
Re: Quadrojet on a Mopar? [Re: Greg_Gessler] #792219
09/20/10 02:43 AM
09/20/10 02:43 AM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
Too Many Posts
DaytonaTurbo  Offline
Too Many Posts

Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
While I like the thermoquad from a design standpoint, these days the quadrajunk can actually be a very good carb. At least with the q-jets, reproduction parts are available like jets, metering rods, etc. I would kinda like to try a pair of q-jets in a dual quad setup.

Re: Quadrojet on a Mopar? [Re: scratchnfotraction] #792220
09/20/10 03:02 AM
09/20/10 03:02 AM
Joined: Jul 2008
Posts: 30,252
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,252
Florida STAYcation
Quote:

best way to mod a GM q-jet it to grind .. it up for scrap-metal ...






THERE ...I "fixed" yurr post ferr you !!

And as far as you using the word thermobog ? EFFEN you use the proper tool to adjust the secondary air-valve .... this potential-issue would not be a problemO.

Re: Quadrojet on a Mopar? [Re: patrick] #792221
09/20/10 03:25 AM
09/20/10 03:25 AM
Joined: Jul 2008
Posts: 30,252
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,252
Florida STAYcation
Quote:

Quote:

I accused the county of doing it, till I found out it came from the dealer that way. They went to the q-jet because they couldn't tune the t-quad. Dumb. The q-jet ran ok but I liked the T-quad better.




no, they couldn't meet emissions with the t-quad....




This is not what I heard Patrick .....

Back in the 80's I had not even handled a TQ .... OK - I admit ...I was a Berry-Bumz back then ... BUT I saw the light and corrected my errors !!

But I heard that the reason the OEM dropped the TQ is because Carter dropped the TQ ....because they saw the handwriting-on-the-wall ...that carbs were going to be DINOsaurs in no time.

Re: Quadrojet on a Mopar? [Re: dIc dOc Deity !] #792222
09/20/10 03:41 AM
09/20/10 03:41 AM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
Too Many Posts
DaytonaTurbo  Offline
Too Many Posts

Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
Quote:


But I heard that the reason the OEM dropped the TQ is because Carter dropped the TQ ....because they saw the handwriting-on-the-wall ...that carbs were going to be DINOsaurs in no time.




I don't buy that. If carter had chrysler, a large OEM customer they would not just say 'too bad' to chrysler, shut down the thermoquad factory and destroy all the tooling for it. The notion of the thermoquad factory burning down seems a lot more plausable to me.

Re: Quadrojet on a Mopar? [Re: DaytonaTurbo] #792223
09/20/10 04:01 AM
09/20/10 04:01 AM
Joined: Jul 2008
Posts: 30,252
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,252
Florida STAYcation
Not asking you to "buy" anything .. that is just what I remember happening.

There was never really any good "aftermarket" demand for the TQ(vs the Berry) ... and there WAS that "handwriting" ... and Chryler's OEM demand for the TQ ? .... vs say their demand for a the TBI's that they were putting on most of their vehicles at the time .... was an ant-hill vs Mt Everest.

WHEN WAS the last carb installed on a Mopar ? ... and how about the other companies such as GM and Ford.

I don't know ...I am asking. But it was not THAT far off from when Carter dropped the TQ.

Re: Quadrojet on a Mopar? [Re: dIc dOc Deity !] #792224
09/20/10 10:32 AM
09/20/10 10:32 AM
Joined: Jan 2003
Posts: 4,587
St. John's Newfoundland
440newport Offline
master
440newport  Offline
master

Joined: Jan 2003
Posts: 4,587
St. John's Newfoundland
Quote:

WHEN WAS the last carb installed on a Mopar




I think it was 1990 on the 360 trucks. 1989 with the end of the M body for cars.

Re: Quadrojet on a Mopar? [Re: 440newport] #792225
09/20/10 10:39 AM
09/20/10 10:39 AM
Joined: May 2003
Posts: 15,487
Florida
S
scratchnfotraction Offline
I Live Here
scratchnfotraction  Offline
I Live Here
S

Joined: May 2003
Posts: 15,487
Florida
thermobog

quadrojunk

holley gasholes

carterbroke

eiddiebrakes

I just one to work for me

spedbore or squarebore

gotta give it up to my shade tree striped q-junk,it only leaks fuel every where,but kicks 19 mpgs and makes the 318 scream

been running junk all my life,I am just tied or working on them

can I just have one that works?


Re: Quadrojet on a Mopar? [Re: scratchnfotraction] #792226
09/20/10 11:01 AM
09/20/10 11:01 AM
Joined: Aug 2003
Posts: 4,481
Mesa, AZ
P
Pat_Whalen Offline
super gas
Pat_Whalen  Offline
super gas
P

Joined: Aug 2003
Posts: 4,481
Mesa, AZ
I haven't seen it mentioned here, so I think I'll add it.

Had a quadrajet on my 360 and while rebuilding it, found a resource that had a lot of information on repairing the deficiencies that most q-jets had:

Casting plugs in the fuel bowl tend to leak, causing the carb to "empty" while it sat overnight. Epoxy around them cured the problem.

Throttle shaft bushings were almost always worn out. A kit with new bushings and the correct drill bit is available.

The main body tends to warp after the carb has been apart a couple of times due to overtightening of the longer bolts in the front. Even the lower portion can begin warping. Either straighten yours or find a donor for the main body.

Re: Quadrajet on a Mopar? [Re: Pat_Whalen] #792227
09/20/10 03:18 PM
09/20/10 03:18 PM
Joined: Dec 2003
Posts: 32
New Jersey
G
Greg_Gessler Offline
member
Greg_Gessler  Offline
member
G

Joined: Dec 2003
Posts: 32
New Jersey
Federal emissions requirements killed the carburetor, the OEM's saw that FI was the way to go to be able to better control the A/F mixture under various conditions.


QuadrajetParts.com Carburetor Parts Superstore Carter, Ford/Motorcraft & Rochester www.QuadrajetParts.com Rebuild kits and Hard to find parts.
Re: Quadrojet on a Mopar? [Re: dIc dOc Deity !] #792228
09/20/10 03:45 PM
09/20/10 03:45 PM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
Too Many Posts
DaytonaTurbo  Offline
Too Many Posts

Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
Quote:

Not asking you to "buy" anything .. that is just what I remember happening.

There was never really any good "aftermarket" demand for the TQ(vs the Berry) ... and there WAS that "handwriting" ... and Chryler's OEM demand for the TQ ? .... vs say their demand for a the TBI's that they were putting on most of their vehicles at the time .... was an ant-hill vs Mt Everest.





I'm not arguing the fact the handwriting was on the wall for the downfall of the carb. But carter had way over a decade of build time on the thermoquad, I don't think they would have just decided to throw out all the tooling, infrastructure and training they had invested into thermoquad production while OEM orders from chrysler were still comming in. If chrysler changed carb suppliers for whatever reason, maybe the TQ couldn't meet emissions standards??, that would make more sense. If the OEM orders ceased, and with little aftermarket demand for the TQ, stopping production and changing the factory to produce some thing else would have made perfect business sense. IIRC, mopar started putting quadrajets on the v8's several years before the tbi system appeared on a mopar v8.

Re: Quadrojet on a Mopar? [Re: wedgeheaded] #792229
09/21/10 12:56 AM
09/21/10 12:56 AM
Joined: Jul 2003
Posts: 1,107
Spring Valley ,Ca.
moparsquid Offline
super stock
moparsquid  Offline
super stock

Joined: Jul 2003
Posts: 1,107
Spring Valley ,Ca.
my 85 1 -ton 4-door ex navy dodge had one on it and it was a dog.!

Re: Quadrojet on a Mopar? [Re: DaytonaTurbo] #792230
09/21/10 01:11 AM
09/21/10 01:11 AM
Joined: Jul 2008
Posts: 30,252
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,252
Florida STAYcation
Quote:



If chrysler changed carb suppliers for whatever reason, maybe the TQ couldn't meet emissions standards??, that would make more sense.







From what I remember hearing ... the TQ was a muchO BESTer emission piece than the QJ ...again it was all about that "handwriting". And I say that Carter saw-the-light sooner. SURE Chrysler would have kept ordering ... but at what kind of volumn ...vs what they were with the TBI systems?

For sure .. ANY carb can not hold a candle to a good TBI or DPFI system in most every way. Their decade-of-R&D on the TQ ...was good while it lasted.

And for me ... I did not appreciate the FINESE that the TQ had(over all the others) ...uNtil way later.

Re: Quadrojet on a Mopar? [Re: dIc dOc Deity !] #792231
09/21/10 09:50 AM
09/21/10 09:50 AM
Joined: Jan 2003
Posts: 2,931
P
Paul_Fancsali Offline
master
Paul_Fancsali  Offline
master
P

Joined: Jan 2003
Posts: 2,931
Some of the Q jets had a throttle restriction to keep them from WOT. They were and excellent carb and function with little to no problem for thousands of milesThe best part of them was they could get gas mileage and decent performanceI still have couple NOS ones for Mopars. Drill out the idle mixture plugs and you have one smooth running carb

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