Quote:
Originally Posted by elmariachi
You are saying that the vacuum secondaries on this brand new carb are not opening?
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I'm not sure. I could get movement - just a little - revving it in the garage with what turned out to be a third-weakest spring. Now I can get no movement, even with no spring, but that's not too uncommon for vacuum secondaries. They do need an engine under load, not just revving.
I put the weakest spring on and got the characteristic hopping stumble of too-early secondaries, so there's that much indication that they're working.
With the original spring refitted, some hard pulls (okay, semi-hard, but definitely into secondary zone) didn't move the rod index at all.
I now have the second-weakest spring, in between the one that hopped and the one that didn't move, installed and will see how it drives tomorrow.
None of this had much effect on the low-end bog, so I put the 0.031 squirters back and changed the accel cam to a more radical early curve. We'll see how that does tomorrow, too.
PS - My deleted post listed all the diagnostics I did on the vacuum pod. It's fully functional, no leaks, no binding, etc. My only question is whether it's getting the correct vacuum signal from the carb - and those passages seem to be clear.