chargers777
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Any problems hooking up the throttle linkage and kickdown. Do you like it compared to other carbs good or bad.
Anyone run a quadrant on their mopar
- Thread starter chargers777
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chargers777
Well-Known Member
- Joined
- Apr 21, 2007
- Messages
- 117
- Reaction score
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Quadrajet
The Quads came on some of the 318 engines and maybe 360
in the mid 60s. NHRA must think the are better than The Thermo
because they rate the 318 Four HP higher with the Quad that the Thermo.
A lot of Guys run the Quadrajet in Superstock but the are easier to modify
and tune. They are also more common in Stock/SS.
However, IF you really understand and can modify the Thermoquad, i believe
they are every bit as fast if not more.
But + That is a Big IF.
in the mid 60s. NHRA must think the are better than The Thermo
because they rate the 318 Four HP higher with the Quad that the Thermo.
A lot of Guys run the Quadrajet in Superstock but the are easier to modify
and tune. They are also more common in Stock/SS.
However, IF you really understand and can modify the Thermoquad, i believe
they are every bit as fast if not more.
But + That is a Big IF.
The Quadrajet is just a Thermoquad in a different package. Great carburetors.
I’d like to read more of that article.
I have t seen a QJ in a very long time. I’d imagine there is a little curve to hooking them up but nothing that can’t be easily worked around.
QJ’s did appear on both small blocks. They work pretty good no doubt. The small fuel bowl is easily emptied if you do not have a capable fuel pump.
I think that might be @VOETOM's dad. What say you Tom? Is Jim your pappy? I know he was a big Pontiac racer.
That is him and yes, he is. Tom took me for a ride in Jim's Pontiac wagon last spring. Very nice gentleman just like his son! Tom is behind the wheel.
I thought so! That's one wagon you'd BEST be ready for if you pull along side! lol
Here's a clip of him running at KCIR back before it was closed.
As an auto technician in the 80’s for GM and a Mopar guy since birth…. I’m. A Therm-quad guy.
Quadra-bog is real.
The fact BOTH have a love or hate relationship is because unlike a Holley you actually have to “think” and know what you are doing as one step will throw all the other parts off if you just throw a different part at it.
Holley made it simple for GM guys to compete with Ford guys. And vice a versa.
From a dealer perspective- quadrajunks as we named them worked for the 8 to 80, blind, crippled or crazy drivers.
They were a very reliable carburetor. They just like the thermoquad, Quadra jets even got adapted for emissions and did quite well considering. It was not until early fuel injection OBD 1 systems that carbs lost favor in the auto industry.
My opinion is both are good carbs but are limited to the persons knowledge and availability of parts. You cannot magically make either one be a rock star by following a magazine article and not knowing what the hack you are doing.
Syleng1
Quadra-bog is real.
The fact BOTH have a love or hate relationship is because unlike a Holley you actually have to “think” and know what you are doing as one step will throw all the other parts off if you just throw a different part at it.
Holley made it simple for GM guys to compete with Ford guys. And vice a versa.
From a dealer perspective- quadrajunks as we named them worked for the 8 to 80, blind, crippled or crazy drivers.
They were a very reliable carburetor. They just like the thermoquad, Quadra jets even got adapted for emissions and did quite well considering. It was not until early fuel injection OBD 1 systems that carbs lost favor in the auto industry.
My opinion is both are good carbs but are limited to the persons knowledge and availability of parts. You cannot magically make either one be a rock star by following a magazine article and not knowing what the hack you are doing.
Syleng1
Nothing wrong with a Quadra-Jet carb. They take more work than a TQ to get right. There are tubes that need to be "adjusted" to 1.00 inch and you need to clean, bead blast and epoxy the bowl plugs on the bottom of the bowl. Then I use a brass float, look up 69 Corvette primary and secondary rods should get you close for a high performance engine. Adjust the secondary air valve for a slight bog then tighten the spring just a skosh till the bog goes away. They made Mopar throttle arms, but the standard Mopar adapter should work for the throttle and kickdown. Last problem is the choke depending on which one is on the carb. In the end, they are a good carb that will get good mpg and make plenty of trouble free power.
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The problem I see with the QJ is thec secondaries set up. The sec system varied greatly. The air valves varied. Some were plain, some had holes in them, some were notched. Some had pullover tubes above the top of the blades, others were below the top. Almost custom made for the application.
With the TQ on the other hand, the sec air valve function was identical among models except for the WOT position [ adjustable ], the sec air bleed & the number, size, position of the holes in the sec discharge tubes.
With the TQ on the other hand, the sec air valve function was identical among models except for the WOT position [ adjustable ], the sec air bleed & the number, size, position of the holes in the sec discharge tubes.
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