carb issues

[PKRWUD]

Originally Posted by ~The Jester~

PKRWD, nothing at all personal here bro, I value each and every one of your posts. But this one I think we need to have a discussion on. The adjustment on the accelerator pump cam CAN'T be 0.000" for the simple reason that at WOT, you'll rupture the diaphragm on the accelerator pump. Remember, that's all mechanical linkage, and there's no room for errors, or "over run". Like I said, nothing personal, I'm just looking to learn something here!

Am I missin' something?

Nothing personal taken! This is a common area of misunderstanding when it comes to Holley carbs. First of all, you won't rupture the diaphragm no matter how badly it's adjusted, thanks to it's design. That's why there is a little spring around the screw and nut you adjust it with. Even when you bottom out the pump housing lever, the spring inside the pump will experience coil bind before the diaphragm would rupture. The worst thing that can happen from adjusting the linkage too tight is that you won't get the full 30cc shot of fuel. The perfect adjustment is zero clearance, but most people don't seem to be able to adjust it to zero, so actual clearance is recommended in their literature. But believe me, zero clearance will give you the best possible results.