Quote:
Originally Posted by Va68goat
Formulajones,
I don't want to upset Mike or anyone else but I've been the one listening to this motor knock for over two years. I think the reason he thinks it subsided at 12 degrees is because it was idling around 1000-1100 rpm's. Ive been down that road of getting excited to hear "less" knocking but as soon as you bring it to normal idle, it's the exact same knock as before. I don't have to know motors to hear the same knock that has kept me off the road for 2 years.
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I think what you said right there is key. Normal idle. What you might consider normal may not be what a performance engine wants. Idling out of gear at 1,000-1100 rpm is actually very common if an engine has a camshaft with a fair amount of overlap for it's size. If I remember right you're running a fairly decent cam in this thing. Something in the 240's @ .050 is what I recall. That's not likely going to be a happy engine idling down at 600-700 rpm unless you are really sharp on tuning the idle circuits/emulsions and some other trickery.
My thought is that when Highway put the timing at 12 and had the engine idling at 1,000 and you heard less knock, it's probably because it was knocking less LOL You might want to pursue that route further.