Thermoquad vs Quadrajet - Page 3

Jim Wahl · 12-18-2009, 05:54 PM

I have seen many of the bowls vary in color from black to dark brown. Remember these "plastic carburetors" bowls were made of a polyfiber-resin materiel that is rather fragile. The "red" could have been a different resin compound they were trying out, but again, I have done hundreds of Thermoquads for Stock and Super Stock applications and never seen one of the "red" bowls. Jim

Run to Rund · 12-18-2009, 10:46 PM

The 800 Qjet is easy to tell from the 750 once you have seen both. The outer ring (the primary venturi) is round in a 750, and larger with a protruding bump in it on the 800s. I've seen 800s on such unlikely stuff as a late 70s Olds 350. In that case, the linkage that opens the secondary throttle blades was restricted so they didn't open all the way.

Jeff Lee · 12-18-2009, 11:54 PM

The red bowl was marketed as a performance application. Mid-late '70's I think?

Wow...there's a Thermoquad.com site!
http://www.thermoquads.com/page203.html

CFM differences here:
http://promaxcarbs.bizland.com/thermoquad.htm

GTX JOHN · 12-21-2009, 02:11 AM

Thanks to everybody for the good feedback! I'll let you know by March how the Quad seems to be working out. John Irving

Randy B.791 · 12-21-2009, 10:13 PM

John if you go to a quadrajet put the thermoquad on jr. car.(n/sa) record with that carb i thought would be fast enough. See u after new years race at sac.

Randy B.791

Redlight · 12-22-2009, 09:58 AM

Danny, you gots mail.

12-18-2009, 05:54 PM	#21
Jim Wahl Veteran Member Join Date: Jan 2002 Location: Central Florida Posts: 5,842 Likes: 627 Liked 672 Times in 121 Posts	Re: Thermoquad vs Quadrajet I have seen many of the bowls vary in color from black to dark brown. Remember these "plastic carburetors" bowls were made of a polyfiber-resin materiel that is rather fragile. The "red" could have been a different resin compound they were trying out, but again, I have done hundreds of Thermoquads for Stock and Super Stock applications and never seen one of the "red" bowls. Jim __________________ Jim Wahl....NHRA #2239 S/SS - IHRA # 8 Stock, D2 Stock Champion (forever I guess) 2019 Baby Gators Stock Champion 2009 D2 National Open Stock Champion 1981 D2 West Palm Beach LDRS SS Runner Up Past President, Southern Stock / Super Stock Association. SSSSA Forum Moderator

12-18-2009, 10:46 PM	#22
Run to Rund Senior Member Join Date: Sep 2007 Posts: 574 Likes: 6 Liked 44 Times in 22 Posts	Re: Thermoquad vs Quadrajet The 800 Qjet is easy to tell from the 750 once you have seen both. The outer ring (the primary venturi) is round in a 750, and larger with a protruding bump in it on the 800s. I've seen 800s on such unlikely stuff as a late 70s Olds 350. In that case, the linkage that opens the secondary throttle blades was restricted so they didn't open all the way.

12-18-2009, 11:54 PM	#23
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 2 Times in 2 Posts	Re: Thermoquad vs Quadrajet The red bowl was marketed as a performance application. Mid-late '70's I think? Wow...there's a Thermoquad.com site! http://www.thermoquads.com/page203.html CFM differences here: http://promaxcarbs.bizland.com/thermoquad.htm __________________ Jeff Lee 7494 D/S '70 AMX Last edited by Jeff Lee; 12-19-2009 at 12:06 AM.

12-21-2009, 02:11 AM	#24
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,530 Likes: 2,222 Liked 1,809 Times in 572 Posts	Re: Thermoquad vs Quadrajet Thanks to everybody for the good feedback! I'll let you know by March how the Quad seems to be working out. John Irving

12-21-2009, 10:13 PM	#25
Randy B.791 Junior Member Join Date: Feb 2009 Posts: 16 Likes: 0 Liked 0 Times in 0 Posts	Re: Thermoquad vs Quadrajet John if you go to a quadrajet put the thermoquad on jr. car.(n/sa) record with that carb i thought would be fast enough. See u after new years race at sac. Randy B.791

12-22-2009, 09:58 AM	#26
Redlight Junior Member Join Date: Aug 2009 Posts: 23 Likes: 0 Liked 0 Times in 0 Posts	Re: Thermoquad vs Quadrajet Danny, you gots mail.