General Category > Quadrajet Carb Talk and Tips
Idle tuning
Cliff Ruggles:
You will need to modify the idle system for that much camshaft.
I would get into the book deeper to familiarize yourself with what will need to be done to the idle system.
Since you didn't use our kit, I'd also recommend installing the high flow N/S assembly, small float, HP accl pump and secondary cam/spring, at a minimum.....Cliff
Cliff Ruggles:
"No to more initial timing advance. At 8-9 degrees it's hard to start, kicks back and breaks starters."
I'd also check cranking pressure. With that much cam in a 10 to 1 CR 454 it should not be "bucking" the starter on hot re-starts with only 8-9 degrees of initial timing.......
55 Tony:
What is cranking pressure and how is it measured?
I do have high compression, 195 to 205 psi.
Also how does this effect idle mixture? That's my only problem.
55 Tony:
Edit:
Sorry, never heard of it called cranking pressure before, so the 195 to 205 is my cranking pressure.
The cam is advanced 2 degrees which is partially responsible for the high compression.
As for "bucking" the starter, that even happens on COLD starts if I advance over 7 degrees. Could be my compression ratio is higher than I thought? Don't ask why but deck height was never measured. Only made sure the pistons didn't hit the valves. My first rebuild.
Cliff Ruggles:
Was the cam ICL set according to the cam card or did you just advance it 2 degrees from the "dot to dot" position?
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