Balancing ARC crank.

ChuckZZ

Member
I noticed that on the ARC web site that when using the 6580 crank in an animal that re-balancing is recommended. Is this a necessity? I don't seem to see a lot of people talking about it here on Bobs. My plan is to only turn it around 8,300.
 
My first thought was; if the manufacturer is saying it needs to be balanced, I would listen.

The more RPM you turn, the greater the balancing factor has to be. I don't know enough about "balancing factors" to explain to you, but if it was me I would be on the phone with the guy who builds it.

My personal experience is with an open Mac 91. Horstman used to sell tungsten counterweights that you welded onto the crank. If they helped, I couldn't say for sure, but I qualified first in every race I ran that motor, in Norcal, and won all but one race. Clutch failure.
 
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