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Thermoquad secondary jet source #1047111 08/04/11 11:48 AM 08/04/11 11:48 AM
Joined: Jan 2003 Posts: 1,551 Marion,Indiana S Seth_Jones OP pro stock
Seth_Jones OP pro stock S Joined: Jan 2003 Posts: 1,551 Marion,Indiana	Any body know where to buy TQ scondary jets? I have found some primary jets for sale but no secondary.

Re: Thermoquad secondary jet source [Re: Seth_Jones] #1047112 08/04/11 12:49 PM 08/04/11 12:49 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Demonsizzler?

Re: Thermoquad secondary jet source [Re: dogdays] #1047113 08/04/11 02:41 PM 08/04/11 02:41 PM
Joined: May 2003 Posts: 902 Gilbert, AZ A Aspen7695 super stock
Aspen7695 super stock A Joined: May 2003 Posts: 902 Gilbert, AZ	I purchased secondary jets from; C-A Vasquez Ent. Inc BFIC Fuel Systems 1617 Magnolia Blvd Burbank, CA 91506 818 845-9000 They were $9.50 each. They had a pretty good selection of sizes. Raul

Re: Thermoquad secondary jet source [Re: Seth_Jones] #1047114 08/04/11 03:37 PM 08/04/11 03:37 PM
Joined: Jul 2008 Posts: 30,537 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,537 Florida STAYcation	IF you want to go to a slightly larger jet(on a single carb application) ... just gently drill it out. IF you want to go smaller jet ... like for a dual carb application ... that is another issue. I have plans on doing some R&D work on the secondary spray-bars.... to make them more efficient.

Re: Thermoquad secondary jet source [Re: dOc !] #1047115 08/04/11 03:42 PM 08/04/11 03:42 PM
Joined: Jan 2003 Posts: 1,551 Marion,Indiana S Seth_Jones OP pro stock
Seth_Jones OP pro stock S Joined: Jan 2003 Posts: 1,551 Marion,Indiana	My 850 is rich at WOT with a 143 jet so I put a 137 in it(leanest I had) and the AFR went from 10 to 11.5 while my cruise AFR is lean.I would like to get some secondary jets in the 120 range.

Re: Thermoquad secondary jet source [Re: Seth_Jones] #1047116 08/04/11 05:17 PM 08/04/11 05:17 PM
Joined: Jan 2006 Posts: 21 Ontario, Canada K krep76 member
krep76 member K Joined: Jan 2006 Posts: 21 Ontario, Canada	I'm going through the same thing at the moment. I've got the primaries where I want them with 95's, but with the 137's secondaries, WOT is in the high 10's. I was questioning the secondary door spring tension but haven't had a chance to check it. Have you played around with that to see if it makes any difference? I found it strange that these things would come stock with even bigger jets that the 137's if they run that rich. Last edited by krep76; 08/04/11 05:46 PM.

Re: Thermoquad secondary jet source [Re: krep76] #1047117 08/04/11 06:52 PM 08/04/11 06:52 PM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	Headers & blocked heat risers will change things a bit

Re: Thermoquad secondary jet source [Re: Seth_Jones] #1047118 08/04/11 08:12 PM 08/04/11 08:12 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	depending on what carb you have maybe a secondary jet from a 318 TQ would be better? "The only thing to do for triumph of evil is for good men to do nothing" "NUNQUAM NON PARATUS!"

Re: Thermoquad secondary jet source [Re: Rug_Trucker] #1047119 08/04/11 09:04 PM 08/04/11 09:04 PM
Joined: Jan 2003 Posts: 1,551 Marion,Indiana S Seth_Jones OP pro stock
Seth_Jones OP pro stock S Joined: Jan 2003 Posts: 1,551 Marion,Indiana	I have the correct carb(6453)for 360 duster auto and the engine is bone stock with heat crossover blocked.A few years ago Dulcich(Mopar Muscle article) tuned one on a chassis dyno and with the 110 jet(the leanest made)he fought rich WOT readings while the primaries were lean at mid range.

Re: Thermoquad secondary jet source [Re: Seth_Jones] #1047120 08/05/11 12:57 AM 08/05/11 12:57 AM
Joined: Jan 2003 Posts: 3,103 Phila Pa S scatpacktom master
scatpacktom master S Joined: Jan 2003 Posts: 3,103 Phila Pa	Why not just fill yours in and drill them to what ever size you want?

Re: Thermoquad secondary jet source [Re: Seth_Jones] #1047121 08/05/11 01:07 AM 08/05/11 01:07 AM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	Quote: My 850 is rich at WOT with a 143 jet so I put a 137 in it(leanest I had) and the AFR went from 10 to 11.5 while my cruise AFR is lean.I would like to get some secondary jets in the 120 range. Is your secondary air door adjusted to open all the way? Quote: Why not just fill yours in and drill them to what ever size you want? I have read someone else on here suggesting to fill them with sodder, then drill them out.

Re: Thermoquad secondary jet source [Re: scatpacktom] #1047122 08/05/11 02:56 AM 08/05/11 02:56 AM
Joined: Jan 2003 Posts: 5,270 Missouri M MY340 master
MY340 master M Joined: Jan 2003 Posts: 5,270 Missouri	Quote: Why not just fill yours in and drill them to what ever size you want? McMaster-Carr has a good selection of drill sizes for jetting. Take the primary jets out of some old TQ's and turn them into secondary jets in different sizes. The secondary air opening is also adjustable with the tab that will let you open the door more or less at WOT. 1970 FE5 Duster 360/904/3.91's SOLD 1973 TB3 SpaceDuster 340/4spd/4.10's SOLD Moparless for now but when the opportunity is right I'll have another one.

Re: Thermoquad secondary jet source [Re: Seth_Jones] #1047123 08/05/11 09:11 AM 08/05/11 09:11 AM
Joined: Sep 2004 Posts: 2,093 oberlin, Ohio Rapid340 top fuel
Rapid340 top fuel Joined: Sep 2004 Posts: 2,093 oberlin, Ohio	Quote: My 850 is rich at WOT with a 143 jet so I put a 137 in it(leanest I had) and the AFR went from 10 to 11.5 while my cruise AFR is lean.I would like to get some secondary jets in the 120 range. Make sure the secondary jet air bleed path is open and clean. Also, take a look at the secondary air door angle in the fully open postion (check for clean choke pulloff operation). If there is a valve in the air cleaner snorkel check for fully open operation. (If you are running a stock air cleaner you may want to consider flipping the lid or installing slightly taller element). 1971 Factory Appearing Duster 340 11.000 @ 122 mph

Re: Thermoquad secondary jet source [Re: scatpacktom] #1047124 08/05/11 09:54 AM 08/05/11 09:54 AM
Joined: Jan 2003 Posts: 1,551 Marion,Indiana S Seth_Jones OP pro stock
Seth_Jones OP pro stock S Joined: Jan 2003 Posts: 1,551 Marion,Indiana	I may have to do just that but 1) don't have drill bit selection suited for this 2) not sure what solder to use so it actualy sticks to the brass Air door is adjusted all the way open and the air cleaner lid is upside down.

Re: Thermoquad secondary jet source [Re: Seth_Jones] #1047125 08/05/11 11:02 AM 08/05/11 11:02 AM
Joined: Jan 2003 Posts: 1,551 Marion,Indiana S Seth_Jones OP pro stock
Seth_Jones OP pro stock S Joined: Jan 2003 Posts: 1,551 Marion,Indiana	I just now scored some .110 jets from one of our old timer techs here at work.Just need to find the time to get them put in and test.

Re: Thermoquad secondary jet source [Re: Seth_Jones] #1047126 08/05/11 02:21 PM 08/05/11 02:21 PM
Joined: Jan 2003 Posts: 3,103 Phila Pa S scatpacktom master
scatpacktom master S Joined: Jan 2003 Posts: 3,103 Phila Pa	Silver solder would do the trick for anyone looking to fill some jets.

Re: Thermoquad secondary jet source [Re: Seth_Jones] #1047127 08/05/11 04:01 PM 08/05/11 04:01 PM
Joined: Jul 2008 Posts: 30,537 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,537 Florida STAYcation	Quote: Air door is adjusted all the way open The air-door should NEVER be all the way open.

Re: Thermoquad secondary jet source [Re: dOc !] #1047128 08/05/11 04:17 PM 08/05/11 04:17 PM
Joined: May 2003 Posts: 902 Gilbert, AZ A Aspen7695 super stock
Aspen7695 super stock A Joined: May 2003 Posts: 902 Gilbert, AZ	On our Stock Eliminator cars we set the air door at .890 to .895. Other racers will set them at .860 to .865 and jet them a bit leaner. I do not know anyone who has the door open all he way. Raul

Re: Thermoquad secondary jet source [Re: dOc !] #1047129 08/05/11 04:17 PM 08/05/11 04:17 PM
Joined: Sep 2004 Posts: 2,093 oberlin, Ohio Rapid340 top fuel
Rapid340 top fuel Joined: Sep 2004 Posts: 2,093 oberlin, Ohio	There is a spec that indicates what the correct open position is (usually listed for convenience in the rebuild kit instructions). Under wide open throttle the air door should be open to this position. I use a different setting than the factory spec (a little tighter) that I have picked up some ET but the OEM spec should be fine in this case. Last edited by Rapid340; 08/05/11 04:25 PM. 1971 Factory Appearing Duster 340 11.000 @ 122 mph

Re: Thermoquad secondary jet source [Re: dOc !] #1047130 08/05/11 04:37 PM 08/05/11 04:37 PM
Joined: Jan 2003 Posts: 1,551 Marion,Indiana S Seth_Jones OP pro stock
Seth_Jones OP pro stock S Joined: Jan 2003 Posts: 1,551 Marion,Indiana	I believe its at.500 right now but I have had it adjusted to where its almost shut and everywhere in-between with no change in WOT AFR readings. Last edited by Seth_Jones; 08/05/11 04:39 PM.

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