Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
170- series metering rod suffixes
cobalt327:
Of the late type 170-series metering rods I have, there are several different suffixes. I have "J", "P" and "M" rods. Above “Schurkey” asked about a “L” rod, I’ve not seen those before.
I see that the J (tapered) and P (stepped) rods have about 0.026" tips and the M rods have about 0.036" tips. I want to say the M rods are tapered even though they do have a step, but it seems the step is well above where a step would normally be if it was part of the metering area, if you follow me.
Is there anything else that you can add?
Again, thank you for your time and for generously sharing your knowledge.
cobalt327:
I should have added "K" metering rods to those above. They have 0.026" tip, and are stepped. Are these similar to the P rods above?
cobalt327:
--- Quote from: cobalt327 on January 09, 2012, 11:52:04 AM ---I should have added "K" metering rods to those above. They have 0.026" tip, and are stepped. Are these similar to the P rods above?
--- End quote ---
I just found a post you made on the K rods:
"The "K" metering rods do not have enough adjustment on the upper section, so with each combination that you used, the control of the part throttle A/F was limited to a range of .005".
We never use "K" series metering rods, as they don't provide enough control via the APT screw to give full control of the part throttle fuel from rich to lean. With a full tapered metering rod, the APT will provide an adjustment range from the larger section (.044" for example) all the way down to the .026" tip size.....Cliff"
So taking that a step further, it would seem the tapered rods (like J and M rods) are preferred over stepped rods when using APT?
Schurkey:
My 45L rod:
[Later edit:] I don't know if this is an ORIGINAL metering rod. The carb was opened up before I got it--idle mixture screws un-sealed. MAYBE someone has already played games with the fuel curve.
429bbf:
my friend is giving me a 17056264 off his 76 pontiac 455 stock to rebld it was made by carter. date code E6. when i get it apart ill see whats in it for jets and rods. it never been off the car his folks bought it new.dean
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