I really want the Thermoquad sound but should I?
#2677895
07/16/19 11:25 AM
07/16/19 11:25 AM
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Joined: Jan 2003
Posts: 28,067 Irving, TX
feets
OP
Senior Management
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OP
Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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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.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: I really want the Thermoquad sound but should I?
[Re: feets]
#2677904
07/16/19 11:54 AM
07/16/19 11:54 AM
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Joined: Jul 2003
Posts: 4,772 Holland MI Ottawa
2boltmain
master
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master
Joined: Jul 2003
Posts: 4,772
Holland MI Ottawa
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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.
Keep old mopars alive.
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Re: I really want the Thermoquad sound but should I?
[Re: 2boltmain]
#2677907
07/16/19 11:58 AM
07/16/19 11:58 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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Hell yeah. Nuttin' sounds better than a thermoquad trying to suck the hood off. Plus, a well tuned thermoquad is a grrrreat carb.
Jack
K.I.S.S.
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Re: I really want the Thermoquad sound but should I?
[Re: BeEtLeJuIcE !]
#2677946
07/16/19 02:25 PM
07/16/19 02:25 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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The only one of those new street demons I know of around here don't have the t-quad sound.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: I really want the Thermoquad sound but should I?
[Re: topside]
#2678023
07/16/19 06:20 PM
07/16/19 06:20 PM
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RWG75
Unregistered
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RWG75
Unregistered
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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?
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Re: I really want the Thermoquad sound but should I?
[Re: feets]
#2678076
07/16/19 09:22 PM
07/16/19 09:22 PM
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Joined: Feb 2005
Posts: 4,314 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,314
Prospect, PA
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I have nothing directly on point. I did run a 800 cfm Holley spreadbore on the factory manifold on my Charger (4300 lbs, stock converter, 3.23, 915 heads, manifolds, 2 1/4" exhaust, MP 272 0.455" cam) after a fresh stock stroke rebuild and its low end was impressiveness. We took that carb/manifold off my car and put it on my buddies 68 X with a well worn, low compression 440 and it ran great too. Both cars would go sideways in 1st gear, and ran into the 13s at over 100 mph.
If it were me, I would go TQ, and use a regular Performer intake.
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Re: I really want the Thermoquad sound but should I?
[Re: BeEtLeJuIcE !]
#2678166
07/17/19 06:42 AM
07/17/19 06:42 AM
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RWG75
Unregistered
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RWG75
Unregistered
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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? FOUR diff cars ? ... now YOU get a free mEmEbErShIp into the ThermoSquad ! Do I get a window sticker with that? Can I get 5 of them because I've got this other car I'm working on and...
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Re: I really want the Thermoquad sound but should I?
[Re: ]
#2678177
07/17/19 07:51 AM
07/17/19 07:51 AM
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Joined: Jan 2003
Posts: 28,067 Irving, TX
feets
OP
Senior Management
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OP
Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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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.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: I really want the Thermoquad sound but should I?
[Re: ScottSmith_Harms]
#2678507
07/18/19 12:06 AM
07/18/19 12:06 AM
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Joined: Jan 2003
Posts: 8,398 Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,398
Highland, MI.
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T-Quads frigging rule. Find a decent used one & rebuild it. I'm saving an OE cast iron intake for a 440 I might have one day even! Came off a 440-Mag 73-74 Charger I found in a junkyard in AZ. many years ago.
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: BeEtLeJuIcE !]
#2678529
07/18/19 06:13 AM
07/18/19 06:13 AM
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Joined: Jul 2003
Posts: 4,772 Holland MI Ottawa
2boltmain
master
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master
Joined: Jul 2003
Posts: 4,772
Holland MI Ottawa
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Check out this ..... TQs A PAIR ... and all smiles ! Their is a pic of Grumpy Bill Jenkins and his tunnel rammed dual thermoquad pre 1970 Camaro out there.
Keep old mopars alive.
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Re: I really want the Thermoquad sound but should I?
[Re: feets]
#2678543
07/18/19 07:31 AM
07/18/19 07:31 AM
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RWG75
Unregistered
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RWG75
Unregistered
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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.
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