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Originally Posted by CobraV8
The lighter the rotating assembly is, the quicker it will rev up. That's what lightening pistons and crankshafts, using aluminum rods and flywheels etc. is all about.
As 28oz means a little less counterweight compared to 50oz, it might in fact have some influence.
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You are correct in the less weight of the recip assembly spinning quicker, just incorrect in your understanding of what the 50oz or 28 oz means. That is not the weight in the crank, that is the weight needed outside the crankcase(on the flywheel/damper) to balance it out. So a 28 oz crank needs less weight added, which means it is heavier than the 50 oz crank. The point that I was making, that applies directly to this, is that the total weight of either recip assembly will be the same... the weights and balance are directy tied to the weight of the rods and pistons. So there will be no advantage in the spin up. Now if you are lightening the rods and pistons, as you discussed, that would help, because it would require less weight be added. But as is pointed out in the post above, the 28oz crank is heavier than the 50oz. The weights stated are not what weight is in the crank, but how much has to be added externally. This, of course, makes the 28oz crank heavier than the 50oz one. From the parts you ar using, I would believe that they are even heavier than stock (heavier duty parts usually are), so you will likely have to add even more weight than the 28 or 50 oz's that the cranks require.