Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
idle help
77cruiser:
73SS have you checked your damper for TDC.
Nice carb old cars.
Cliff Ruggles:
"Next I converted it to DMAB."
Old Cars, could you describe this modification?
Pics?
73ss:
--- Quote from: 77cruiser on June 21, 2021, 06:43:51 AM ---73SS have you checked your damper for TDC.
Nice carb old cars.
--- End quote ---
Yes, during the build with a dial indicator, spot on. I would like to think that nothing slipped on the damper, but anything is possible. The entire rotating assy came as a kit.
The car is starting to come around as I get some miles on it. Was able to close the throttle a tad and get it off the transfer slots some more. I'm going to leave the lower bleeds at .070 and try some .039 tubes this weekend. If it doesn't respond well to that I'll put the .038's back in.
77cruiser:
--- Quote from: Cliff Ruggles on June 22, 2021, 04:10:22 AM ---"Next I converted it to DMAB."
Old Cars, could you describe this modification?
Pics?
--- End quote ---
Don't know if he did his the same, but mine I blocked original bleed & added 2 about where they would be on an older DMAB carb. I also reduced the LIAB to .063 & moved the upper to the lid.
Cliff Ruggles:
It's all in the details.
Blurbs about making modifications without specifics don't provide the readers with anything they can work with.
So basically not helping the situation any if at all.
Generic answers don't help either. Like optimal advance at idle being 32 degrees. Where does that come from? Why is 32 degrees the magic number for these engines? Is that proven fact and well documented or did someone just happened to find an engine once that like that much timing at idle and ran poorly if you tried anything else?
I've tuned engines that HATED much more than 8-10 degrees at idle, and others that had to have 35 degrees to even have a snowballs chance in hell of idling under 1000rpms.
Once again, it's all in the details and generic or blanket statements don't really help much when it comes to these things.......FWIW.....
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