Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

metering for a dodge 318

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Ethan1:

--- Quote from: 74 Powerwagon on February 21, 2017, 11:43:23 AM ---I just ordered a set of CK secondary rods, they are the same as the AU rods. Thanks for your time and expertise Ethan, Kent :D

--- End quote ---

 Yes they are, Kent. You're welcome bud! Ethan 8)

74 Powerwagon:
I recently rebuilt this carb with a kit from Cliff and added a fuel pressure regulator as the carb started flooding gas out of the vent. It runs good now, I also adjusted the APT to fix an off idle stumble. My issue is that I can adjust the idle mix screws all the way in and the engine doesn't die, that includes both screws all the way closed. I can see if loosening the idle speed screw with mix screws closed will kill it. I live at 9k in the Rockies and am wondering if I may need some more idle bypass air to make up for the thin air. It does idle down with the speed adjustment. The bypass air holes are currently .055. Thanks to all for the advice.

Cliff Ruggles:
How big are the holes under the mixture screws?

Does the engine slow down when you turn the mixture screws in?

It's common not to be able to kill off the engine as there is still some transfer slot exposed at idle to give it fuel, but you should have control with the mixture screws by being able to lean it up enough to slow it down some.

Also curious why it would be flooding out the vent with new parts installed.  Those carbs can handle a lot of fuel pressure without issue........Cliff

74 Powerwagon:
Hi I noticed that I goofed when I assembled the needle and seat and the needle fell off the float, once I put it back on the float and checked by blowing in the inlet with the carb upside down the needle and seat worked fine. The flooding issue was why I got the kit and a regulator to make sure my fuel pressure wasn't too high. It is now at 5psi steady and doesn't leak.
I drilled the mixture screw ports out to.093 and shortened the springs. The engine did not slow much if any with the idle mix screws, the idle speed adjustment does slow idle speed. The original idle bypass air is .055 and I haven't enlarged it.
Should I loosen the idle speed adjustment so it isn't on the butterfly shaft at all, or only just touching, and then see if the idle mix screws have any effect? Maybe the springs on the idle mix screws are still too long and the screws aren't closed when they bottom out the springs.
Thank you Cliff for sharing your extensive experience with us.

Cliff Ruggles:
You mentioned changing the camshaft and timing set.  What cam did you install in the engine?

What is the compression ratio?

What timing set?

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