Properly measuring crank bobweight?
After looking at stroker cranks I finally found out about "Crank Bobweight". To correctly balance a rotaiting assembly. The Bobweight of a crank is determined by 50% Reciprocating Mass and 100% Rotaiting weight. Which is determined by the weight of the pistons, rings, and rods. Then the machinest will drill out the holes in the crank determined by the balancing machine.
And then the rotaiting assembly gets balanced together with the hub, front balancer, and flywheel. Which in my case is an Aluminum Mcleod with removable weight. I would have used my original steel flywheel and had it resurfaced but I was told switching to aluminum is like putting a seventy-five shot of nitrous on it. It does have a steel clutch surface which looks well made reinforced with rivots and such. I think with the added rotaiting mass of a forged 3.75 crank, six hundred gram forged 5.7 I beam rods, and Wiseco forged -5cc Flat Top pistons I will have enough to make up for the flywheel weight lossLast edited by CraZ28; Feb 11, 2010 at 12:32 PM.
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