Quadrajet secondary hanger question
Thread Starter
Melting Slicks
Joined: Jun 2001
Posts: 2,340
Likes: 2
From: Moro IL
Quadrajet secondary hanger question
Hoping somebody can clear this up. I was looking through Doug Roe's book and there is a part where it contadicts itself on the hangers. My assumption is the smaller the dimension for the hanger .520 vs a .615 the higher it will lift with a given air valve opening, which is what it says on page 152 in the sidebar. now on page 133 in the text under "secondary fuel metering" it says .520 for lean, .570 for average, and .615 for rich. Now this is opposite of what the sidebar says. This is from the HP book series Rochester Carberators by Doug Roe. So which is it?
Pat Kunz
Pat Kunz
Race Director
Joined: Jun 2000
Posts: 10,045
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From: FL
OK, pulled out my copy of the book. Found what you are talking about. I would have to go with what it says on pg 152. The lower the rod hangs down into the jet, the leaner the mixture.
Now, according to Lars' Q-Jet tuning guide, any hanger can be bent to make it a performance hanger. To quote the Norse carb guru:
Now, according to Lars' Q-Jet tuning guide, any hanger can be bent to make it a performance hanger. To quote the Norse carb guru:
With the secondary airvalve held wide open and the secondary rods pulled all the way up, measure the distance from the top of the rear wall of the choke horn to the secondary rod hanger hole in the hanger. This distance should be 41/64”. Bend the hanger to adjust – you have to adjust each of the two sides independently. You now have a “performance” rod hanger.
Thread Starter
Melting Slicks
Joined: Jun 2001
Posts: 2,340
Likes: 2
From: Moro IL
Thanks Steve,
I'm surprised no one else ever said anything about that discrepency in the book. I was planning on getting some other secondary hangers to play with and maybe some other metering rods and was confused when I read that, so at least yor thinking the same way I am, the smaller the number the higher the lift.
Pat Kunz
I'm surprised no one else ever said anything about that discrepency in the book. I was planning on getting some other secondary hangers to play with and maybe some other metering rods and was confused when I read that, so at least yor thinking the same way I am, the smaller the number the higher the lift.
Pat Kunz
