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Re: I really want the Thermoquad sound but should I?
[Re: ]
#2678666
07/18/19 11:59 AM
07/18/19 11:59 AM
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Joined: Jan 2003
Posts: 8,509
Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,509
Highland, MI.
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My vote is go with the TQ but ya can't really go by me - I'm running (4) of them. What year Imp are ya working on? It's a large by huge 72 Imperial crew cab. As opposed to those tiny coupes? When it comes to big barges the fuselage ones have always been my faves. 70 ish 300 drop top on the bucket list. TQs really fit the luxo cruiser well - mild and quiet when running on just the primaries, terrifying in a refined and civilized way when you hold them all the way open. Depends on the gear. Later Imps had higher gears and I've driven a couple 74s and 75s that would shift in to 3rd around 80 mph. About the time the passengers start getting uncomfortable about how wound up the big block is and wondering if it will ever shift, it does and they really start to worry because it's still pulling like an aircraft tug. Agreed, on an automatic car the downshift combined with the T-Quad opening the massive secondaries is an intimidating sound.
No Man With A Good Car Needs To Be Justified
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Re: I really want the Thermoquad sound but should I?
[Re: feets]
#2678722
07/18/19 02:15 PM
07/18/19 02:15 PM
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Joined: Feb 2011
Posts: 211
Halifax, VA.
moparjack44
enthusiast
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enthusiast
Joined: Feb 2011
Posts: 211
Halifax, VA.
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I'm starting to make time to put the Imperial's 440 together. The original plan was to inject it but I think I'm going to go with a carb for a while. That would get me on the road quicker and allow me to use the extra funds for other stuff on the car.
I've been looking at the Street Demon and my CH4B.
The engine is built for low to mid-range torque with 10.2:1 compression, Eddy heads, and a mild cam. The old Desktop Dyno software suggested the build would make 460+ lb/ft from 2000 - 5000 with a peak nudging 500 lb/ft. HP would top out around 440. It's a 5300 lb car with a 3.23 gear and 29" tires.
So, assuming I can turn 400 lb/ft at the wheels to get this fatty cruising effortlessly down the highway, should I do it with a reman TQ and different intake or stick with the Street Demon and CH4B? Sadly, I don't have hood clearance for a Performer RPM or carb spacer.
My first car was a 74 RR with a 360 and I miss the sound of that Thermoquad at full gallop. The Imperial is very quiet and that howl would add that extra little touch that the old beasts need. Can you still get TQ's? I used to have a basket full, eventally gave them all away  Is there room for dual set up on Weiand intanke on first Gen 392?
K.I.S.S.
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Re: I really want the Thermoquad sound but should I?
[Re: 2boltmain]
#2678926
07/19/19 12:51 AM
07/19/19 12:51 AM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Might as well try the new Street Demon
. It gets great reviews and its design takes the best attributes of the Thermoquad , Quadra jet and AFB and puts it into an all new carburetor. Is that the one that is kinda square looking and is like the Thermoquad ?? Also I remember guys turning the air cleaner lid upside down to have about a 1/4" to 1/2" open space around the air cleaner edge as it really woke up that suction sound where it sounded like it wanted to suck the hood into the eng. It was mostly guys with the Quadrajet that did that as there was many more of them around then Thermoquads but the are like the Thermoquad with large secondaries and small primaries. Ron
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Re: I really want the Thermoquad sound but should I?
[Re: moparjack44]
#2679024
07/19/19 09:33 AM
07/19/19 09:33 AM
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Joined: Feb 2011
Posts: 211
Halifax, VA.
moparjack44
enthusiast
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enthusiast
Joined: Feb 2011
Posts: 211
Halifax, VA.
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I'm starting to make time to put the Imperial's 440 together. The original plan was to inject it but I think I'm going to go with a carb for a while. That would get me on the road quicker and allow me to use the extra funds for other stuff on the car.
I've been looking at the Street Demon and my CH4B.
The engine is built for low to mid-range torque with 10.2:1 compression, Eddy heads, and a mild cam. The old Desktop Dyno software suggested the build would make 460+ lb/ft from 2000 - 5000 with a peak nudging 500 lb/ft. HP would top out around 440. It's a 5300 lb car with a 3.23 gear and 29" tires.
So, assuming I can turn 400 lb/ft at the wheels to get this fatty cruising effortlessly down the highway, should I do it with a reman TQ and different intake or stick with the Street Demon and CH4B? Sadly, I don't have hood clearance for a Performer RPM or carb spacer.
My first car was a 74 RR with a 360 and I miss the sound of that Thermoquad at full gallop. The Imperial is very quiet and that howl would add that extra little touch that the old beasts need. Can you still get TQ's? I used to have a basket full, eventally gave them all away Is there room for dual set up on Weiand intanke on first Gen 392? O heck. After some "research" I find that smallest CFM on Thermoquad is 800. Too much for my 2 4 set up on my 1st Gen 392, so reckon I am SOL. I had gotten excited about running a Thermoquad (actually 2) again. I know that a single Thermo is better than my 2 500CFM Edbrocks set up, but sometimes you just gotta go with the WOW!!! factor of 2 instead of 1  .
K.I.S.S.
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Re: I really want the Thermoquad sound but should I?
[Re: moparjack44]
#2679041
07/19/19 10:15 AM
07/19/19 10:15 AM
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RWG75
Unregistered
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RWG75
Unregistered
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I don't trust reman TQs from anywhere except my bench. Have seen too many of them fouled up and no surprise as they're not exactly easy to set up. Ok, was one guy that did them for years and knew his thing but he's pretty much faded. The last few I build for myself were ebay $50 ish basket cases, some parts from my stash and a few bits from quadrajetparts.com Nice thing about that site is ya can buy the 4 parts you need for 1/3 the cost of a generic rebuild kit with a bunch of parts you don't need.
As far as I know, the CFM rating is what they're capable of inhaling and it only comes in to play when your engine is trying to gulp more than what it can suck through the carb. Basic example is that TQs came in 800 (early) and 850 (most) versions and Chrysler used them as OEM on 318s which clearly wouldn't need all that air. The trick, and the cool thing about TQs, is mix and match rods and jets until you get the net fuel rate that works with your engine.
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Re: I really want the Thermoquad sound but should I?
[Re: BSB67]
#2679389
07/20/19 10:21 AM
07/20/19 10:21 AM
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RWG75
Unregistered
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RWG75
Unregistered
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I can't say I've often heard TQs described as simple. As for voodoo, that's no help. Perhaps the be best analogy here is women - they make a lot more sense when you understand how they work. I've always said that the linkages connecting the choke, choke pull off, fast idle cam and secondary air door is a design Rube Goldberg would be proud of. The subtitles of It are under documented and your best help there is another correctly set up one for reference. The frequently misunderstood thing is the relationship between curb idle throttle setting, curb idle mix setting and meter rod yoke height. The last one being the most important part of the carbs designed in flexibility and a thing many people screw up and then try to compensate for by screwing up the other adjustments.
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Re: I really want the Thermoquad sound but should I?
[Re: ]
#2679405
07/20/19 11:19 AM
07/20/19 11:19 AM
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Joined: May 2019
Posts: 6,589
nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,589
nowhere
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Re: I really want the Thermoquad sound but should I?
[Re: Sniper]
#2679428
07/20/19 12:26 PM
07/20/19 12:26 PM
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Joined: Jan 2003
Posts: 10,685
S.E.Ohio
Magnumguy
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,685
S.E.Ohio
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I know of a Ken Manley ( he's on Facepage  ) and RWG75 that rebuilds them. Oh, and ~Yes~ Go for it
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Re: I really want the Thermoquad sound but should I?
[Re: Sniper]
#2679578
07/20/19 09:03 PM
07/20/19 09:03 PM
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Joined: Jan 2003
Posts: 3,704
MICHIGAN
DynoDave
master
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master
Joined: Jan 2003
Posts: 3,704
MICHIGAN
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