Pick basics of new eliminator

Tony Curcio · 01-13-2010, 08:32 PM

Restrictors are certainly a lot cheaper than a new set of heads.

I recall now that when I had a 2 bbl. on our G/Pure Stock combo, the same engine that went through the traps at 7000 with a Q-Jet would run out of steam at 5700with the 2 bbl. Bigger ports would only have made the situation worse.

Billy, how would you like to try it out? Do you have the equip to make a restrictor for a Q-Jet? If not, what should the specs be, maybe I can get something made. I'd be willing to try it at the test & tune before the Atco Nat'l Open (Thurs April 1st).

Any small block Ford or Mopar guys interested? We only want to compare how much each combo drops off, and if they start off close in performance, do they remain so.

Billy Nees · 01-14-2010, 07:32 AM

Tony, I'd love to see how a restrictor plate would react. I can get the plate made. I don't know where to start with dimensions and I'm not sure if a plate would fit under a Q-jet. (throttle blades might hit plate)
Any ideas on plate dimensions?

X-TECH MAN · 01-14-2010, 10:19 AM

Quote:

Originally Posted by Billy Nees

Tony, I'd love to see how a restrictor plate would react. I can get the plate made. I don't know where to start with dimensions and I'm not sure if a plate would fit under a Q-jet. (throttle blades might hit plate)
Any ideas on plate dimensions?

Billy....you could start with 3/4 inches. (.750) or (smaller 5/8th or 1/2 inch holes) and use a 1/4 inch thick plate then allow and adaptor an inch thick above that so the carb butterflies will clear. . Thats what we used (1/2 inch) with the 2 barrel class production S/S cars in IHRA. Work from there until you find what works best. Just a suggestion.

Tony Curcio · 01-14-2010, 06:22 PM

The Q-Jet secondary blades protrude down .75" from the bottom of the base, so the spacer/restrictor needs to be at least that tall.

Holley 4150 rated at 500 cfm has 1.50' diameter throttle bores- all four.
A 600 cfm model is 1 9/16".

Holley makes an adapter intended to mount a Q-Jet or Thermo Quad on a manifold designed for Holley 4150 or 4160 (PN 17-6).

Maybe a 4 hole gasket underneath this adaptor is all that's needed for this test.

01-13-2010, 08:32 PM	#1
Tony Curcio Member Join Date: Mar 2002 Location: West Chester, PA Posts: 271 Likes: 1 Liked 4 Times in 1 Post	Re: Pick basics of new eliminator Restrictors are certainly a lot cheaper than a new set of heads. I recall now that when I had a 2 bbl. on our G/Pure Stock combo, the same engine that went through the traps at 7000 with a Q-Jet would run out of steam at 5700with the 2 bbl. Bigger ports would only have made the situation worse. Billy, how would you like to try it out? Do you have the equip to make a restrictor for a Q-Jet? If not, what should the specs be, maybe I can get something made. I'd be willing to try it at the test & tune before the Atco Nat'l Open (Thurs April 1st). Any small block Ford or Mopar guys interested? We only want to compare how much each combo drops off, and if they start off close in performance, do they remain so. __________________ Tony Curcio 1860 STK

01-14-2010, 07:32 AM	#2
Billy Nees VIP Member Join Date: Oct 2002 Location: On a hilltop in Pa. Posts: 4,504 Likes: 3,606 Liked 7,814 Times in 1,748 Posts	Re: Pick basics of new eliminator Tony, I'd love to see how a restrictor plate would react. I can get the plate made. I don't know where to start with dimensions and I'm not sure if a plate would fit under a Q-jet. (throttle blades might hit plate) Any ideas on plate dimensions? __________________ Billy Nees 1188 STK, SS I'm not spending 100K to win 2K

01-14-2010, 06:22 PM	#4
Tony Curcio Member Join Date: Mar 2002 Location: West Chester, PA Posts: 271 Likes: 1 Liked 4 Times in 1 Post	Re: Pick basics of new eliminator The Q-Jet secondary blades protrude down .75" from the bottom of the base, so the spacer/restrictor needs to be at least that tall. Holley 4150 rated at 500 cfm has 1.50' diameter throttle bores- all four. A 600 cfm model is 1 9/16". Holley makes an adapter intended to mount a Q-Jet or Thermo Quad on a manifold designed for Holley 4150 or 4160 (PN 17-6). Maybe a 4 hole gasket underneath this adaptor is all that's needed for this test. __________________ Tony Curcio 1860 STK

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode