Q-jet metering rods
Thread Starter
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
Q-jet metering rods
Hi, all,
I have a Summit Racing Q-jet on my 1980 'vette (When I bought it, it had a leaky old holley with an adapter for the spreadbore manifold), it has a 50M primary metering rod, does this rod have a .036 power tip? And if so, should I stay with metering rods that have a .036 power tip or switch to .026 power tips? And if I should change to .026 tips, what is the best way to do this as far as keeping the metering area the same?
Scott
I have a Summit Racing Q-jet on my 1980 'vette (When I bought it, it had a leaky old holley with an adapter for the spreadbore manifold), it has a 50M primary metering rod, does this rod have a .036 power tip? And if so, should I stay with metering rods that have a .036 power tip or switch to .026 power tips? And if I should change to .026 tips, what is the best way to do this as far as keeping the metering area the same?
Scott
Melting Slicks
Joined: Apr 2006
Posts: 2,084
Likes: 14
From: Airdrie Alberta
Cliffs might be able to help, they have a Q-Jet forum here
http://www.cliffshighperformance.com...machinesforum/
http://www.cliffshighperformance.com...machinesforum/
Thread Starter
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
Cliffs might be able to help, they have a Q-Jet forum here
http://www.cliffshighperformance.com...machinesforum/
http://www.cliffshighperformance.com...machinesforum/
Scott
Thread Starter
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
Scott
Melting Slicks
Joined: Oct 2006
Posts: 2,417
Likes: 336
From: Texas
Team Owner
Joined: Mar 2002
Posts: 24,160
Likes: 78
The correct k-series .026 rods are no longer made. You'll have to use the m-series rods and size up the jet accordingly. I went through this hassle a couple years ago. (And it was this among other things that ultimately made me switch to a Summit Racing Holley clone) 
Racer
Joined: Feb 2007
Posts: 271
Likes: 25
From: Buena Vista Colorado
Found this web site a couple of weeks ago and haven't seen it posted anywhere on the forum yet. LOTS of Quadrajet parts:
QuadrajetParts.com
I have no experience with or connection to the company.
QuadrajetParts.com
I have no experience with or connection to the company.
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Melting Slicks
Joined: Mar 2005
Posts: 2,838
Likes: 10
From: Austin TX
Racer
Joined: Nov 2004
Posts: 485
Likes: 1
From: Oakville ON
Found this web site a couple of weeks ago and haven't seen it posted anywhere on the forum yet. LOTS of Quadrajet parts:
QuadrajetParts.com.
QuadrajetParts.com.
Carburetion.com doesn't sell K rods.
First, you should 'mike' the rods you have.
Last edited by Rich's'78; Jan 29, 2011 at 01:07 PM.
Team Owner
Joined: Mar 2002
Posts: 24,160
Likes: 78
I'm telling you, you'll pull your hair out trying to find the right k-series rods. They are no longer manufactured. I have heard of guys turning down the truck rods on a hobby lathe, but that is beyond my capability.
Thread Starter
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
What is up with that? if there is a demand for them, why isn't somebody filling it?
OK, so I guess I'm stuck with four primary metering rods to choose from. Doesn't seem like a lot, there are a wide variety of sizes on the pre-1975 rods.
Could I ask for some advice from the q-jet gurus out there? I'll start from the beginning. When I bought my 'vette, it had a leaky old holley 600 on it. I got rid of it and purchased a q-jet from Summit Racing. (SUM-210216 - Summit Racing® Remanufactured Quadrajet) It has .073 primary main jets, 50M primary metering rods, and DR secondary metering rods. I have since found out that my 'vette originally came with a 17080204 Q-jet, with .071 main jets, 42 primary metering rods, and CH secondary metering rods. The metering areas at both WOT and isle are richer on the 17080204 (original stock carb) and the only engine mods are a Performer intake manifold, block-hugger headers, and a 2 1/2 inch dual exhaust with magnaflow mufflers. Should I try to get as close as I can to the stock carbs metering areas, and tune from there, or just start playing around with what I already have? The car runs OK now, so I suspect I should just start from where I am.
Scott
OK, so I guess I'm stuck with four primary metering rods to choose from. Doesn't seem like a lot, there are a wide variety of sizes on the pre-1975 rods.
Could I ask for some advice from the q-jet gurus out there? I'll start from the beginning. When I bought my 'vette, it had a leaky old holley 600 on it. I got rid of it and purchased a q-jet from Summit Racing. (SUM-210216 - Summit Racing® Remanufactured Quadrajet) It has .073 primary main jets, 50M primary metering rods, and DR secondary metering rods. I have since found out that my 'vette originally came with a 17080204 Q-jet, with .071 main jets, 42 primary metering rods, and CH secondary metering rods. The metering areas at both WOT and isle are richer on the 17080204 (original stock carb) and the only engine mods are a Performer intake manifold, block-hugger headers, and a 2 1/2 inch dual exhaust with magnaflow mufflers. Should I try to get as close as I can to the stock carbs metering areas, and tune from there, or just start playing around with what I already have? The car runs OK now, so I suspect I should just start from where I am.
Scott
