Quote:

Given the engine with the lighter bob weight has proper balancing for the weight change, is there a way of measuring the lighter rotating assembly and express it in max rpm change?



I dont know about the rpm change BUT if you were to
move the weight inward on the crank to balance it
(cut the counter weights down) you do 2 things, you
move the weight in tighter to the c/l and you take
that big sail out of the oil pan reducing the windage
which in turn allows it to accelerate faster... JMO