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Would a Thermo Quad work on a 408?
#978234
04/22/11 06:15 PM
04/22/11 06:15 PM
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Joined: Aug 2003
Posts: 1,123
Seaford Delaware
JSR1485
OP
super stock
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OP
super stock
Joined: Aug 2003
Posts: 1,123
Seaford Delaware
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I am in process of switching my Duster from a race car back to a street car. I am putting a 408 and 4 speed in it. anybody run a Thermo quad or think it would work well on a stroker and be responsive on the street? I building this to be a driver more than just a steet/strip car.
Switched to the dark side...
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Re: Would a Thermo Quad work on a 408?
[Re: 340SHORTY]
#978236
04/22/11 06:52 PM
04/22/11 06:52 PM
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Joined: Aug 2003
Posts: 2,682
Clinton Twp. Michigan
coronet1966d
master
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master
Joined: Aug 2003
Posts: 2,682
Clinton Twp. Michigan
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Quote:
Thermo  
why all the opinions in Q&A? obviously some people dont like these carbs but why post if you dont have anything constructive to add?
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Re: Would a Thermo Quad work on a 408?
[Re: coronet1966d]
#978238
04/22/11 06:55 PM
04/22/11 06:55 PM
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Joined: Sep 2004
Posts: 6,906
IL, Aurora
ademon
master
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master
Joined: Sep 2004
Posts: 6,906
IL, Aurora
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Quote:
Quote:
Thermo
why all the opinions in Q&A? obviously some people dont like these carbs but why post if you dont have anything constructive to add?
there machanical & ability to read a service manual skills are lacking 
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Re: Would a Thermo Quad work on a 408?
[Re: JSR1485]
#978245
04/22/11 10:06 PM
04/22/11 10:06 PM
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Joined: Jan 2003
Posts: 826
Stone Mt, GA.
DEMONSIZZLER
super gas
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super gas
Joined: Jan 2003
Posts: 826
Stone Mt, GA.
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The important thing about a T.Q. is actually in selecting the larger cfm 850 cfm on a performance engine. And it is critical that the jetting parameters be set also to accommodate the non stock engine. Examples would be bolt on mods such as headers, aftermarket intake, different cam ect. Once the jetting parameters are set, the carb is very hard to beat in both gas mileage and performance.
As others have said above, the power is there! And a T.Q. is a very reliable carb and fine tuning is done externally via easy-to-do adjustments for all 4 circuits:
accelerator pump shot,
idle circuit,
cruise circuit
and wot circuit.
That is the beauty of the great carb! Normal driving is smooth but when you go wot, performance is as good as any other 4 bbl carb. So as alluded to above, a T.Q. will work great on a small block stroker, David.
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Re: Would a Thermo Quad work on a 408?
[Re: JSR1485]
#978246
04/22/11 10:16 PM
04/22/11 10:16 PM
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Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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I don't have any problem sharing the details of my build, it's actually a pretty mild engine all things considered. I went with some expensive parts but most were certainly overkill and not required to make dependable HP on the street. Here are the basics: Mopar Performance "Resto" 340 block, custom lightened by Ryan J at Shady Dell Machine, bushed for a roller cam later on Iron 915 "J" heads with A LOT of port work (flow in the high 200's) T&D rocker gear with 1.6 ratio Stainless Ferrea valves Beehive springs Custom Comp Hyd. Flat Tappet cam = Gross numbers 551Intake/542exaust, I've been sworn to secrecy on the rest of the grind details Scat Lightweight Forged 4.125 Stroker Crank Carillo Steel Rods ARP bolts throughout Diamond forged lightweight pistons (9.6:1) 4972 TQ carb Stock 1971 TQ intake with zero mods Stock 1971 340 exhaust manifolds = Extrude Honed I've dynod it twice now because of a head swap, the latest set of heads (detailed above) gained 20HP, TQ remained the same. Latest dyno runs made on 92 octane pump gas. My goal was to build a FAST legal stock appearing engine that could also be run on the street with pump gas. Because of the compromise I won't be setting any FAST records but I'll certainly enjoy waxing off the locals with my "Stock" 340 Duster  *BTW, if 100% originallity is not a major concern the new RHS iron heads ported by Brian (member OU812) are a steal and will net you similar flow numbers that I got without spending a small fortune. If you build a solid lower end and have money leftover put as much money into the heads as you can, that's where the bulk of the potential HP is usually hiding, opening up your intake and exhaust to match will complete the package. After that you can hunt for the extra hidden HP in cams, timing, jet changes and other smaller tweaks. I'm not an engine builder but I've paid for a few good ones and that's been my experience. My next engine will be a 440 cube stroker based off of a 4.25" crank and an original 340 block (a good one I have that passed a sonic check for core shift). It will be a dedicated FAST engine with all of the go fast FAST tricks (high compression, big roller cam, aluminum rods, etc.etc.).
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Re: Would a Thermo Quad work on a 408?
[Re: ScottSmith_Harms]
#978248
04/22/11 11:40 PM
04/22/11 11:40 PM
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Joined: Sep 2004
Posts: 6,906
IL, Aurora
ademon
master
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master
Joined: Sep 2004
Posts: 6,906
IL, Aurora
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Quote:
I don't have any problem sharing the details of my build, it's actually a pretty mild engine all things considered. I went with some expensive parts but most were certainly overkill and not required to make dependable HP on the street. Here are the basics:
Mopar Performance "Resto" 340 block, custom lightened by Ryan J at Shady Dell Machine, bushed for a roller cam later on
Iron 915 "J" heads with A LOT of port work (flow in the high 200's)
T&D rocker gear with 1.6 ratio
Stainless Ferrea valves
Beehive springs
Custom Comp Hyd. Flat Tappet cam = Gross numbers 551Intake/542exaust, I've been sworn to secrecy on the rest of the grind details
Scat Lightweight Forged 4.125 Stroker Crank
Carillo Steel Rods
ARP bolts throughout
Diamond forged lightweight pistons (9.6:1)
4972 TQ carb
Stock 1971 TQ intake with zero mods
Stock 1971 340 exhaust manifolds = Extrude Honed
I've dynod it twice now because of a head swap, the latest set of heads (detailed above) gained 20HP, TQ remained the same. Latest dyno runs made on 92 octane pump gas.
My goal was to build a FAST legal stock appearing engine that could also be run on the street with pump gas. Because of the compromise I won't be setting any FAST records but I'll certainly enjoy waxing off the locals with my "Stock" 340 Duster
*BTW, if 100% originallity is not a major concern the new RHS iron heads ported by Brian (member OU812) are a steal and will net you similar flow numbers that I got without spending a small fortune. If you build a solid lower end and have money leftover put as much money into the heads as you can, that's where the bulk of the potential HP is usually hiding, opening up your intake and exhaust to match will complete the package. After that you can hunt for the extra hidden HP in cams, timing, jet changes and other smaller tweaks. I'm not an engine builder but I've paid for a few good ones and that's been my experience.
My next engine will be a 440 cube stroker based off of a 4.25" crank and an original 340 block (a good one I have that passed a sonic check for core shift). It will be a dedicated FAST engine with all of the go fast FAST tricks (high compression, big roller cam, aluminum rods, etc.etc.).
man i'd love to see what a modified intake would do i have about 25 to 30 hours in this thing plenum work, deep gasket match, roof and walls worked, radius all the turns (hardest and most time consuming part) 
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Re: Would a Thermo Quad work on a 408?
[Re: ademon]
#978249
04/23/11 12:51 AM
04/23/11 12:51 AM
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Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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Yes, the general concensus was that the stock intake was the "cork" in my combo, increasing plenum volume would almost certainly be a pretty big boost in HP, especially in the higher RPM range. MY AF ratio was hovering around 13:1 with stock jetting and a choke in place (which was suprising, jetting bigger actually hurt the numbers). I'm sure that with the ported intake the carb would need some work to match the added volume, the general plan would be to eliminate the choke, make some adjustments, run it to get a baseline then rejet/rod, and give it some further flogs on the dyno to check the results before making other changes. For now I'm happy with what I have so no immediate changes are planned for my current engine, however the next engine package will definately include a worked intake. *If you care to donate your worked over intake I'll gladly accept it
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Re: Would a Thermo Quad work on a 408?
[Re: LikarockCrusher]
#978251
04/23/11 08:22 AM
04/23/11 08:22 AM
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Joined: Jan 2003
Posts: 826
Stone Mt, GA.
DEMONSIZZLER
super gas
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super gas
Joined: Jan 2003
Posts: 826
Stone Mt, GA.
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Quote:
Yeah, this seems to be a hot topic. But that aside a member on here ut KYmudder runs a 496 stroker with demonsizzler set up thermaquad. And has out ran bigger cubic inch chevy strokers with dominators. 
That is Mike! He has a really great mud racer Dodge truck that puts the screws to the Ford and Chevys! He runs my MonsterQuad on that truck and has had great success racing, David.
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Re: Would a Thermo Quad work on a 408?
[Re: DEMONSIZZLER]
#978252
04/24/11 01:01 AM
04/24/11 01:01 AM
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
Moparmal
master
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master
Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
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My stroked 318/390 - M1 intake, .5" spacer.
....ran 425 FWHP with a 800cfm TQ - completely un-modded except for the choke shaft being removed.
I swapped to an Eddie Thunder 800cfm and made 10 Rear Wheel HP more.
I'm sure if I'd used a modded 850cfm TQ it would have out ran the Thunder.
67 RO23 clone with 6.1 SRT Hemi and dual quads. Soon to have Drag Pak induction and Throttle body.
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Re: Would a Thermo Quad work on a 408?
[Re: DEMONSIZZLER]
#978253
04/24/11 08:29 AM
04/24/11 08:29 AM
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Joined: Oct 2009
Posts: 164
Indiana, United Staes, Vevay
LikarockCrusher
member
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member
Joined: Oct 2009
Posts: 164
Indiana, United Staes, Vevay
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Quote:
Quote:
Yeah, this seems to be a hot topic. But that aside a member on here ut KYmudder runs a 496 stroker with demonsizzler set up thermaquad. And has out ran bigger cubic inch chevy strokers with dominators.
That is Mike! He has a really great mud racer Dodge truck that puts the screws to the Ford and Chevys! He runs my MonsterQuad on that truck and has had great success racing, David.
Yeah, Mike Smith he's a good ol'boy. He said that carb has left alot of them guys scratching their heads. 
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