Sport,

So herb was saying 15:1?

I better go back and brush up....and then go drill some holes in my crank

I guess the point I was making is everything from the Balancer to the tire that spins needs to be SUMMED, a crank will only spin as fast as the load against it can let it......Light cranks from my experience are really felt above the torque peak and as "panic" (sorry, you'll always be Panic to me!) said it really depends on a lot of other variables. Where it can also pay off (in an obvious but not really mentioned way) is if the lighter mass allows the motor to more safely rev and be built/tuned to a higher HP peak and allow the motor for more RMP/POWER than it would otherwise be able to achieve.