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I really want the Thermoquad sound but should I? #2677895
07/16/19 10:25 AM
07/16/19 10:25 AM
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Irving, TX
feets Offline OP
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Irving, TX
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
Re: I really want the Thermoquad sound but should I? [Re: feets] #2677903
07/16/19 10:52 AM
07/16/19 10:52 AM
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...to Paradise from ParaICE !
Doc Fiberglass Offline
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You SHOULD ! ... the ticket is actually the smaller cfm card on a Eddy Streetmaster intake


...... roger that .., whackin’ the whack JOBS is my mission ...a noble Crusader !
Re: I really want the Thermoquad sound but should I? [Re: feets] #2677904
07/16/19 10:54 AM
07/16/19 10:54 AM
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Holland MI Ottawa
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2boltmain Offline
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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.
Re: I really want the Thermoquad sound but should I? [Re: 2boltmain] #2677907
07/16/19 10:58 AM
07/16/19 10:58 AM
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Halifax, VA.
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moparjack44 Offline
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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.
Re: I really want the Thermoquad sound but should I? [Re: moparjack44] #2677911
07/16/19 11:04 AM
07/16/19 11:04 AM
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...to Paradise from ParaICE !
Doc Fiberglass Offline
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Originally Posted by moparjack44
Hell yeah. Nuttin' sounds better than a thermoquad trying to suck the hood off. Plus, a well tuned thermoquad is a grrrreat carb.

Jack


Agreed mopJack ... bester than a Berri crab any day ! penguin


...... roger that .., whackin’ the whack JOBS is my mission ...a noble Crusader !
Re: I really want the Thermoquad sound but should I? [Re: Doc Fiberglass] #2677946
07/16/19 01:25 PM
07/16/19 01:25 PM
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Kalispell Mt.
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HotRodDave Offline
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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!



Re: I really want the Thermoquad sound but should I? [Re: HotRodDave] #2678001
07/16/19 04:31 PM
07/16/19 04:31 PM
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So Near, Yet So Far
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I would think a silenced vs unsilenced air cleaner would affect the sound of wide-open secondaries.
I can hear the secondaries on my AVS with the unsilenced type.
I don't recall hearing the T-quad under the silenced dual-snorkle being louder on another car I had some years back.
But that could be a sign of advancing age...

Re: I really want the Thermoquad sound but should I? [Re: topside] #2678023
07/16/19 05:20 PM
07/16/19 05:20 PM
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Perkiomenville PA
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RWG75 Offline
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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?


75 Charger SE - 440/4, cop suspension
76 Daytona - survivor
76 Daytona - tweaked
77 PW - macho clone, sno-commander, frankenram
79 RC - this was your fathers 4x4
79 LRE - More fun than it looks
Re: I really want the Thermoquad sound but should I? [Re: RWG75] #2678035
07/16/19 05:41 PM
07/16/19 05:41 PM
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...to Paradise from ParaICE !
Doc Fiberglass Offline
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Originally Posted by RWG75
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 ! penguin


...... roger that .., whackin’ the whack JOBS is my mission ...a noble Crusader !
Re: I really want the Thermoquad sound but should I? [Re: feets] #2678076
07/16/19 08:22 PM
07/16/19 08:22 PM
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Prospect, PA
BSB67 Offline
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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.

Re: I really want the Thermoquad sound but should I? [Re: feets] #2678141
07/16/19 10:41 PM
07/16/19 10:41 PM
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Wills Point, Texas
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Re: I really want the Thermoquad sound but should I? [Re: Doc Fiberglass] #2678166
07/17/19 05:42 AM
07/17/19 05:42 AM
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Perkiomenville PA
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RWG75 Offline
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Originally Posted by Doc Fiberglass
Originally Posted by RWG75
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 ! penguin


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...


75 Charger SE - 440/4, cop suspension
76 Daytona - survivor
76 Daytona - tweaked
77 PW - macho clone, sno-commander, frankenram
79 RC - this was your fathers 4x4
79 LRE - More fun than it looks
Re: I really want the Thermoquad sound but should I? [Re: RWG75] #2678177
07/17/19 06:51 AM
07/17/19 06:51 AM
Joined: Jan 2003
Posts: 27,533
Irving, TX
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Originally Posted by RWG75
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
Re: I really want the Thermoquad sound but should I? [Re: feets] #2678427
07/17/19 06:51 PM
07/17/19 06:51 PM
Joined: May 2003
Posts: 5,483
Downtown Roebuck Ont
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Another vote for the Plastic Fantastic.

I ran one on a 429 I had in a 65 F100. It ran like nails. Great on fuel when driven accordingly and hard on Camaros when you didn't.

Kevin

Re: I really want the Thermoquad sound but should I? [Re: Twostick] #2678485
07/17/19 10:21 PM
07/17/19 10:21 PM
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Posts: 30,587
Grand Prairie,Texas
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Best of both worlds reasonable mileage when driving easily and performance (and great sound) when getting sporty.

Re: I really want the Thermoquad sound but should I? [Re: Twostick] #2678486
07/17/19 10:22 PM
07/17/19 10:22 PM
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Posts: 42,701
Spokane Washington
ScottSmith_Harms Offline
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TQ all the way, fantastic carburetor design. Consider this, Chrysler used them from 1971 well into the 1980's on nearly every V8 they sold, they were in direct competition with fuel injection and performed well against it!

Re: I really want the Thermoquad sound but should I? [Re: ScottSmith_Harms] #2678507
07/17/19 11:06 PM
07/17/19 11:06 PM
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Posts: 7,080
Highland, MI.
Sunroofcuda Offline
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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
Re: I really want the Thermoquad sound but should I? [Re: Sunroofcuda] #2678518
07/18/19 12:21 AM
07/18/19 12:21 AM
Joined: Jul 2008
Posts: 19,636
...to Paradise from ParaICE !
Doc Fiberglass Offline
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Check out this apimp..... TQs A PAIR ... and all smiles ! up

AD0A3434-AAE8-4E46-90AB-6A7D99B55D1B.png

...... roger that .., whackin’ the whack JOBS is my mission ...a noble Crusader !
Re: I really want the Thermoquad sound but should I? [Re: Doc Fiberglass] #2678529
07/18/19 05:13 AM
07/18/19 05:13 AM
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Posts: 4,019
Holland MI Ottawa
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2boltmain Offline
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Originally Posted by Doc Fiberglass
Check out this apimp..... TQs A PAIR ... and all smiles ! up


Their is a pic of Grumpy Bill Jenkins and his tunnel rammed dual thermoquad pre 1970 Camaro out there.


Keep old mopars alive.
Re: I really want the Thermoquad sound but should I? [Re: feets] #2678543
07/18/19 06:31 AM
07/18/19 06:31 AM
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Perkiomenville PA
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RWG75 Offline
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Originally Posted by feets
Originally Posted by RWG75
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.


75 Charger SE - 440/4, cop suspension
76 Daytona - survivor
76 Daytona - tweaked
77 PW - macho clone, sno-commander, frankenram
79 RC - this was your fathers 4x4
79 LRE - More fun than it looks
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