Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Rich at WOT, lean at idle and cruise
modrummer:
--- Quote from: 77cruiser on May 26, 2018, 07:36:06 PM ---Do you have any different secondary rods? Idle could use some work too.
--- End quote ---
I dont have any other secondary rods, but I didnt think a secondary rod change could make enough of a difference to fix a 10:1 rich condition.
For the idle being so lean, should I be drilling the mixture screw holes a little bigger ? Or possibly the idle tubes ?
77cruiser:
May have to do both. Could try the idle mixture holes first.
modrummer:
--- Quote from: 77cruiser on May 27, 2018, 07:18:01 PM ---May have to do both. Could try the idle mixture holes first.
--- End quote ---
Ok I'll start with that. What should I do on the WOT rich bog? It didnt start till I upped the jet size to a 74. Should I try jetting back down to 72 and then raise the power piston height and drill out idle mixture screws and hope that's enough to make the idle and cruise rich enough ?
77cruiser:
What do you have for rods & hanger? Windup on the air valve spring?
Cliff Ruggles:
The idle system is a BIG player here and you need to start there. Idle fuel feeds the main system right off idle and thru transition via the transfer slots, so it is part of the primary side calibration.
Never use used jets and metering rods for custom tuning, they will cause lessons in humility. Always use new parts, if you want accurate results and very, and I mean very fuel jets will pass a pin gauge test and not be worn considerably on the inside from the metering rods being in them for tens of thousands of miles.
Also, K series rods provide very little range of adjustment, we have full tapered rods for that part of the tuning process.
Start with idle tuning, then primary side jet size, then fine tune part throttle A/F with the APT system.
We have the right parts to get you a much better baseline to take a lot of the guesswork out of the equation. This will include jets, metering rods, power piston spring, idle tubes and correct sizes for the DCR's and bypass air.........Cliff
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