Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Adjusting Secondary Air Flaps

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novadude:
Question about those secondary rods....

I think that the CV rods are 0.0527 long tip rods?  Your specs show 0.0410?  CV rods are relatively fat on the upper portion compared to a DR, DA, CE or AX rod.  Could that be causing a bit of a lean spike when the secondary air door first opens?

jagness:
You’re right! According to the chart in Cliff’s book, CVs are .0527. So I don’t know why my specs say .0410. I just looked through my collection of secondary metering rods and found a couple pairs of CEs, which are actually .0410. I’ll give those a try. Thanks for pointing that out!

jagness:
novadude, the CV rods were definitely not right for this engine. I put CEs in it, and it was noticeably better right away. Then I started adjusting the spring. 3/4 was better than 1 turn. 1/2 turn was even better. I tried 1/4 turn, but I think the sweet spot might be about 3/8 turn. I’ll keep playing with it, but I’m definitely in the ballpark now.

I have a pair of CC rods too. I wonder if they’d be too rich. Any thoughts on that?

novadude:
The CC rods are fatter on the upper portion which would make it leaner when the air door is not fully open (before you get to the power tip).  I think the CE rods are probably a better choice.

jagness:
Okay, good to know. It’s not easy to compare them to each other with my calipers.

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