thermo-quad
#301062
04/27/09 02:07 PM
04/27/09 02:07 PM
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Joined: Apr 2009
Posts: 63 minnesota, USA
greenfire
OP
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OP
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Joined: Apr 2009
Posts: 63
minnesota, USA
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any one know what the cmf this themo-quad is? i pulled it off my 318, only #on it are 6-2141 and the #16 in larger size#
proud new owner of a 1974 plymouth satellite sebring plus in decent shape, let the fun begin
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Re: thermo-quad
[Re: greenfire]
#301063
04/27/09 02:22 PM
04/27/09 02:22 PM
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Anonymous
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Anonymous
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i think its 850 but not sure. what do you plan on doing with it?
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Re: thermo-quad
#301064
04/27/09 02:25 PM
04/27/09 02:25 PM
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Anonymous
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Anonymous
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sorry i mistyped. should be between 750 and 800. i think 750 was the smallest thermoquad.
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Re: thermo-quad
[Re: stumpy]
#301066
04/27/09 02:37 PM
04/27/09 02:37 PM
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Anonymous
Unregistered
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Anonymous
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are you looking to rebuild it or replace it. if replacing it a 600cfm eddy or holley would be a better choice. if you go with a 750 or bigger aftermarket they will bog out the engine a bit.
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Re: thermo-quad
[Re: stumpy]
#301067
04/27/09 02:39 PM
04/27/09 02:39 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
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master
Joined: Oct 2003
Posts: 7,506
Az
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If the primary bores are 1 3/8", it is a 750 -800cfm. 1 1/2 primarys = 800 - 850 cfm.
Fastest 300
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Re: thermo-quad
[Re: DEMONSIZZLER]
#301070
04/28/09 12:17 PM
04/28/09 12:17 PM
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Joined: Apr 2009
Posts: 63 minnesota, USA
greenfire
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Posts: 63
minnesota, USA
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thanks guys, looks like it is a 800cmf tq a bit to much carb for a stock 318 imo. and the intake prolly had more leaks then a block of swiss cheese, what a mess lol. gonna put on edelbrock intake with a edelbrock 1405 600 cmf carb to day.
proud new owner of a 1974 plymouth satellite sebring plus in decent shape, let the fun begin
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Re: thermo-quad
[Re: Rug_Trucker]
#301071
04/28/09 07:29 PM
04/28/09 07:29 PM
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Joined: Jan 2003
Posts: 14,610 Not2farfromNashville, TN
Rug_Trucker
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,610
Not2farfromNashville, TN
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Quote:
A TQ will adjust it's CFM via engine demand and a properly adjusted air door.
Read that again. It really seems like you have no experience with carbs. You have the best carb in your hand for a mild engine.
Let Demonsizzler rebuild it. It would be cheaper and better than any after market NEW carb you could buy.
Did you get the model number off it??
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Re: thermo-quad
[Re: Rug_Trucker]
#301072
04/28/09 07:37 PM
04/28/09 07:37 PM
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Joined: Jan 2008
Posts: 2,252 ILLINOIS
volaredon
top fuel
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top fuel
Joined: Jan 2008
Posts: 2,252
ILLINOIS
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Quote:
Quote:
A TQ will adjust it's CFM via engine demand and a properly adjusted air door.
Read that again. It really seems like you have no experience with carbs. You have the best carb in your hand for a mild engine.
Let Demonsizzler rebuild it. It would be cheaper and better than any after market NEW carb you could buy.
Did you get the model number off it??
Ive had a few 318s with aftermarket carbs and none ran as well on there as a TQ. I'm gettin ready to send him (2) baseplates for a rebush job, now that he sent me his address today for shipping.
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Re: thermo-quad
[Re: HotRodDave]
#301075
04/28/09 08:25 PM
04/28/09 08:25 PM
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Joined: Jan 2003
Posts: 9,982 Ansonia, CT
CJK440
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master
Joined: Jan 2003
Posts: 9,982
Ansonia, CT
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Keep in mind the rules change when dealing with a squarebore vs. a spreadbore carb.
A square bore had the same size primaries and secondaries which flow almost equal. So if you go too big with a squarebore the primary venturi's might be so big that the low speed "around the town" vacuum signal suffers.
With a spreadbore, especially one with a huge difference in size between the primary & secondaries like a TQ you can worry less about overcarburating since the primaries are so tiny and very responsive.
Think about this. Holley recomends that you undersize a carb vs too big so the car will have decent idle and midrange characteristics but the magazine builds always find more HP with an oversize Carb. A spread bore is the best of both worlds for a street/strip setup.
2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
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Re: thermo-quad
[Re: greenfire]
#301077
04/29/09 10:24 AM
04/29/09 10:24 AM
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Joined: Mar 2005
Posts: 1,545 Seattle, WA
375inStroke
Special needs person
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Special needs person
Joined: Mar 2005
Posts: 1,545
Seattle, WA
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Tons of info here: Thermoquad guide Manuals, kits, and other stuff here: Carb Dr. The adjustable air door works great on a Thermoquad. I used the same carb on a 318, then on a 440, and it got me 14.20@98MPH with a junk yard motor in a '69 Coronet. Same car with the 318 and that carb was much slower, but never any bog or mixture problems.
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