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thermo-quad #301062 04/27/09 02:07 PM 04/27/09 02:07 PM
Joined: Apr 2009 Posts: 63 minnesota, USA G greenfire OP member
greenfire OP member G Joined: Apr 2009 Posts: 63 minnesota, USA	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

Re: thermo-quad [Re: greenfire] #301063 04/27/09 02:22 PM 04/27/09 02:22 PM
A Anonymous Unregistered
Anonymous Unregistered A	i think its 850 but not sure. what do you plan on doing with it?

Re: thermo-quad #301064 04/27/09 02:25 PM 04/27/09 02:25 PM
A Anonymous Unregistered
Anonymous Unregistered A	sorry i mistyped. should be between 750 and 800. i think 750 was the smallest thermoquad.

Re: thermo-quad #301065 04/27/09 02:30 PM 04/27/09 02:30 PM
Joined: Jan 2003 Posts: 32,947 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,947 Grand Prairie,Texas	The # should be stamped into the corner of the base plate.

Re: thermo-quad [Re: stumpy] #301066 04/27/09 02:37 PM 04/27/09 02:37 PM
A Anonymous Unregistered
Anonymous Unregistered A	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.

Re: thermo-quad [Re: stumpy] #301067 04/27/09 02:39 PM 04/27/09 02:39 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	If the primary bores are 1 3/8", it is a 750 -800cfm. 1 1/2 primarys = 800 - 850 cfm. Fastest 300

Re: thermo-quad [Re: stumpy] #301068 04/27/09 08:32 PM 04/27/09 08:32 PM
Joined: Jan 2003 Posts: 14,610 Not2farfromNashville, TN R Rug_Trucker I Live Here
Rug_Trucker I Live Here R Joined: Jan 2003 Posts: 14,610 Not2farfromNashville, TN	Quote: The # should be stamped into the corner of the base plate. On the driver side rear. If it is the correct carb, it will be an 800. A TQ will adjust it's CFM via engine demand and a properly adjusted air door. "The only thing to do for triumph of evil is for good men to do nothing" "NUNQUAM NON PARATUS!"

Re: thermo-quad [Re: greenfire] #301069 04/27/09 08:46 PM 04/27/09 08:46 PM
Joined: Jan 2003 Posts: 826 Stone Mt, GA. D DEMONSIZZLER super gas
DEMONSIZZLER super gas D Joined: Jan 2003 Posts: 826 Stone Mt, GA.	Those are the top # id. It is a '75-early '78 top. As others said, check the driver rear corner of the base plate for the #'s to id the carb. Also the #'s 2-310 or 2-315 stamped on the bottom side of the primary butterflies is an 800 cfm carb while the #'s 2-314 stamped on the primary butterfly bottom side is an 850 cfm carb, David.

Re: thermo-quad [Re: DEMONSIZZLER] #301070 04/28/09 12:17 PM 04/28/09 12:17 PM
Joined: Apr 2009 Posts: 63 minnesota, USA G greenfire OP member
greenfire OP member G Joined: Apr 2009 Posts: 63 minnesota, USA	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

Re: thermo-quad [Re: Rug_Trucker] #301071 04/28/09 07:29 PM 04/28/09 07:29 PM
Joined: Jan 2003 Posts: 14,610 Not2farfromNashville, TN R Rug_Trucker I Live Here
Rug_Trucker I Live Here R Joined: Jan 2003 Posts: 14,610 Not2farfromNashville, TN	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??

Re: thermo-quad [Re: Rug_Trucker] #301072 04/28/09 07:37 PM 04/28/09 07:37 PM
Joined: Jan 2008 Posts: 2,251 ILLINOIS V volaredon top fuel
volaredon top fuel V Joined: Jan 2008 Posts: 2,251 ILLINOIS	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.

Re: thermo-quad [Re: Rug_Trucker] #301073 04/28/09 07:38 PM 04/28/09 07:38 PM
Joined: Jan 2005 Posts: 12,419 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,419 Kalispell Mt.	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?? An 800 thermoquad is in no way and no how too big for a bone stock 318. I have an 850 thermoquad on my super duper mpg 318 and it is very responsive and gets very good mpg and still pulls hard to 5000 RPM. If you need it fixed send it to demonsizzler or me or any number of thermo quad gurus or even do it your self, it is not very hard and they will run great and be way cheaper than an eddy carb. PS I even had an 850 on a 273 once and it ran great. I have seen them on slant sixes also. There adjustable secondarie air door works VERY well. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: thermo-quad [Re: HotRodDave] #301074 04/28/09 08:00 PM 04/28/09 08:00 PM
Joined: Jul 2008 Posts: 30,451 Florida STAYcation dOoC The village idiot's idiot
dOoC The village idiot's idiot Joined: Jul 2008 Posts: 30,451 Florida STAYcation	The TQ can be made to "fit" most any cubic-inch engine. I helped a guy with a 273 using an 800 cfm one. NO problem ... but you have to throttle-down the secondary side. And put appropriate jetting in it.

Re: thermo-quad [Re: HotRodDave] #301075 04/28/09 08:25 PM 04/28/09 08:25 PM
Joined: Jan 2003 Posts: 9,982 Ansonia, CT C CJK440 master
CJK440 master C Joined: Jan 2003 Posts: 9,982 Ansonia, CT	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"

Re: thermo-quad [Re: Rug_Trucker] #301076 04/29/09 12:55 AM 04/29/09 12:55 AM
Joined: Apr 2009 Posts: 63 minnesota, USA G greenfire OP member
greenfire OP member G Joined: Apr 2009 Posts: 63 minnesota, USA	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?? experince with carbs? with holley yes, quadra-jets yes, and a few edelbrocks yes, with thermo-quads no and the quality black plastic base on this tq is in poor shape, cracked and full of pits not to mention that the previous owner frankensteined all the linkage. a friend donated a edey 600 cmf in good cond , so no charge for the carb, and i know it works. as well as a good match up for the edey intake i have. proud new owner of a 1974 plymouth satellite sebring plus in decent shape, let the fun begin

Re: thermo-quad [Re: greenfire] #301077 04/29/09 10:24 AM 04/29/09 10:24 AM
Joined: Mar 2005 Posts: 1,545 Seattle, WA 3 375inStroke Special needs person
375inStroke Special needs person 3 Joined: Mar 2005 Posts: 1,545 Seattle, WA	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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