Quote:
Originally Posted by blykins
I would use an all-aluminum balancer in a 100% full-race application only, where weight savings is paramount. Aluminum is light, but it's not as capable of absorbing torsional harmonics as well as a steel or steel/aluminum piece.
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That was my thoughts as well.
And some folks say the heavy balancers will kill the crank for instance in dragracing where the RPM's go from 9000 to 1000 in an instant when going off the throttle or from 4000 to 9000 at launch....
"....and is there a relationship between the mass/diameter of the flywheel (and clutch?) and the mass/diameter of the harmonic balancer?"
Add diameter = add mass.
But; the diameter has nothing to do with the flywheel/ balancer imbalance.
For instance in small Cheby (and Ford?) you have 6 and 7" diameter balancers. Not only are the 7" heavier if width & material is the same, but having the mass at a greater distance from the centre makes higher momentum, and therby higher force.
You see racing clutch- setups are twin or tripple 7" and some circletrack (and also cup- cars? And drag- cars?) run without any harmonic balancer.....