Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Put my rebuilt 17057229 on finally
77cruiser:
Try both, I like manifold vac. on my stuff, as long as it has enough vac. in gear so the timing doesn't drop.
Cliff Ruggles:
I use manifold vs ported vacuum to the advance on a case by case basis. Some engines don't want, need, or respond well to a LOT of timing at idle speed.
Others will like and some even require a lot of timing at idle speed. Most of those will be low compression with poor cam choices.
Every engine we build here is fine with around 10-12 degrees initial timing, aside from "full race" stuff of course. Most of those get a very short mechanical curve or "locked out" timing and no VA at all......Cliff
Mudsport96:
Well, I'm still waiting for a new advance can to come in. Nobody, I mean nobody at any of the box stores have on in stock, its a two day wait to get one. So it should come in tomorrow and then I'll get around to installing it.
As for the timing, it idles best at 14 degrees. But then again that may change when I get the carb dialed in. But, 16 initial is the most she will take without kicking back against the starter. I will have to get my book out to see what the compression is but I don't think its I've 9:1 so that may be part of the idle issue as well.
Edit
The H345CP sealed power pistons (according to my sealed power book) gives me an 8.65:1 compression, but I don't know if that is with the standard .039 rebuilder gaskets or the .015 shim gasket that we used when putting it together.
77cruiser:
If you advance the timing with it idling, does the idle improve at all by going up to 20 or so?
I have a hard time believing it's kicking back on 16.
Mudsport96:
The idle doesn't change much from 16-22 idle vacuum doesn't go up passed 16 degrees either. It has an Accel timing tape on the balancer, so no guessing at all. I suppose I can through the piston stop in #1 and double check to make sure the balancer hasn't slipped on the rubber ring.
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