I couldn't have said it better myselfLet me toss in a purely theoretical observation:
First off let's assume (ASS U ME) there are no other extraneous factors screwing up the observation.
Next, we diddle the air screws at idle and achieve complete vacuum bliss at idle. But, being the smart homo sapiens that we are, we know that those silly air screws provided by YammaMama have the biggest effect at idle, and progressively provide diminishing effects as the rpm and (more importantly) air flow increase.
My initial response is, why bother have air screws? If their main effect is at idle, who gives a royal rat's ass how well synchronized the throttle bodies are at idle. If there are vibrations there, they would be minor. To my way of thinking, and I could be way wrong, I want the synchronization to occur at a higher usable rpm, like in the 3500-4500 rpm range.
I can live with a little buzz at idle or even at WFO, but cruise speeds are where we live 90% of the time. Wouldn't we want that to be the smoothest possible?
That wasn't my idea, to use the air screws at 4000 rpm. I was just posing that the balancing needs to be done at higher range, but not via the air screws. Any misbalance at the higher engine speed would have to be adjusted out via the throttle plates.I tried your idea, Fred. I'm not impressed with the results.
What I did was lock the throttle at about 4000rpm and then sync'd the air screws. At idle the throttle bodies were no longer sync'd. I didn't notice any difference in vibration when cruising at 4000rpm, but I did notice that the idle is very rough.
I guess I'll have to try the complete modified sync procedure for the best of both worlds....
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