Chrysler Master Tech - 1972, Volume 72-1 The '72 Thermo-Quad Carburetor

I remember these slide shows with a "beep" to change the slides!!

That Carburator was a huge pile of shit,most got thrown away replaced with Holleys by hot rod guys

Not really, it was just more complicated to adjust so most people were too lazy to work with them and blamed it on the carb not themselves.

My father calls the thermoquad a thermojunk to this day.It was a pain to adjust,could not get it adjusted right.My father does like Chrysler products.He remembers working on them.

Plus the screws never came out.Last one was in a 1985 Dodge Ram Charger,could not get the screws out.Threw it in the scrap pile and replaced it with an Edelbrock carb

Awesome video !!

Most people who dislike TQ carburetors were simply too lazy to do all the adjustments, and IN THE RIGHT ORDER. Follow the book, set everything right, and it's really a great carb. 800CFM and no bogging, and a hell of a lot better fuel mileage than a Holley or older AVS/AFB Carter design.

Thank you for+ posting this ol filmstrip

Hoollyy Fug....I was asked to rebuild one of these......Good thing I told him I would let him know first.

I have worked on these back in the 80's & 90's when I was driving those old 70's Mopars!  I did my 1st rebuild on a '79 Newport 360 Hi-po police engine.  I did it off the "instructions" listed on the aftermarket rebuild kit.  So no real instructions when I performed it!  It took 3-4 disassembly tries before before it seemed to run right, lol.  Mileage was better at 15 mpg vs. 11-12 mpg beforehand, but the 4 barrel "kick" still had a terrible stumble.  I found out eventually that the choke vacuum kicker was what controlled it.  But even after installing a new kicker it still stumbled.  I guess I didn't have the correct instruction available to me to set it up right...
Later as I gotten older and more experienced with carbs, I had taken apart 3 other T-quads with much better results...;-).

Who ever is responsible for posting these videos, THANK YOU! You have taught the next generation of Mopar enthusiast how to do things the right way. If it wasn't for these slide shows, likely put together by the engineers and service factory service techs themselves, a lot of this stuff would be lot.

This is freakin awesome!!! Love these carbs!

I like them as good as a Quadrajet!!!!!!!!!

The vac pulloff is perhaps the most crucial adjustment. Aside from that, dump the closed foam floats for brass 1s. 8 times out of ten, you won't need to bend or adjust anything during a rebuild.

This was a HIGHLY underrated Carburetor! I'm a Retired Auto Mechanic, from 78-06.... And Carburetor and Driveability Specialist.

I've always heard them called "ThermoJUNK" and a few other names.
These and Quadrajets, we're actually fantastic Carbs!! They both gave fantastic high end performance, with excellent low speed Driveability and respectable Emissions...
AND size for size, got BETTER fuel economy than ANY square bore Carb!

I Raced too. I was the first (in my area) to go 12s with a Quadrajet! (FAST was slower than it is today!!) 😜 That was a BIG deal back in the day.

Now as in then, it's ALL about Tuning. True, Thermoquads needed a specific adjustment order. But get it right, and they were great performers.

I tuned one for a friend's 74 Challenger 360. He was sure he needed a Holley, so he bought one. Ran fine, but WOULDN'T pass smog testing, and kept blowing Power Valves!!
He averaged 12mpg also.

I built him a Thermoquad and set it up. He PASSED Emissions, got 17mpg, and GAINED 1/2 second in the quarter!!! 😲

That's because his Holley (when NOT blowing Power Valves) was 600cfm, and most Spreadbore Carburetors were 750-850cfm!! 😎

Very cool Chrysler video. The Thermoquad was way ahead of its time BTW. I've made well over 500HP without having to do many mods.

I have messed with a few TQs in my time. Although 26 years of my experience was at a Ford dealership, we did have customers who also owned motorhomes they brought to the shop for repairs. Some were built on Dodge chassis with a 440 engine. I do remember the TQ carb was very finicky and required a great deal of patience; but that's true for most carbs. I do recall one that had a warped body and would not stop leaking. The mechanic working on it took it apart 3 or 4 times trying to stop the leak before using a straight edge on the plastic body; sure enough it was warped. Finding a replacement body was a challenge; this was pre-internet days and our location was in the middle of nowhere. Eventually we found one and looked like heroes once John repaired the carb for the last time

This is a new Tech voice compared to videos released earlier. Has old tech fallen victim to smoking induced bronchitis finally?

I have 3 of the infamous Carter Thermoquads, they worked pretty good once tuned right, my problem was that plastic bowl, hot/cold weather, it would contract/expand, they developed cracks, other wise, with those big secondaries, whatever the carburetor sat on top of what Mopar motor, GODDAMMIT, sounded mean as hell!!! Mopar Nate Philadelphia, Pennsylvania

It is easy to see how come so many Thermo-Quads are so far out of Spec, when they went in for service

i know this is a old post but i run a 850 on my 440 they are very picky but once you under stand them they work very well i get 11 mpg which dont sound good but thats in a 1973 dodge D 100 club cab with a 727 loadflight trans and 355 rear gears

It was crap replaced it with dual feed double pump holley on my 440