What exactly is involved in getting the rotating assembly balanced? Like what does a machine shop do? And should the motor be copletly assembled or what?


http://www.cardomain.com/ride/2090440

Yes, the motor needs to be completely disassembled. Its a lot like getting your wheels balanced for the crank, and the rest of the parts are wieghed and the parts are made equal in wieght.





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can the head be balanced in some way or is it more for the crank rods and pistons?


http://www.cardomain.com/ride/2090440

any idea how much it costs to get this done?


http://www.cardomain.com/ride/2090440

There isn't really anything in the head that can be balanced like that. Charges differ by shop, call a local one and ask.





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www.j-bodyperformance.com sells balances, knight edges, lightened cranks



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http://www.jbodyperformance.com/new/PartList.php?catId=3&catName=Bottom%20End&subCatId=28&genId=3&genName=3rd%20Generation

theres the link to the cranks



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yea ill just have to call someone around me



http://www.cardomain.com/ride/2090440

so do you still have to balance the assembly when you buy the JBP lightened crank??



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Balancing the rotating assembly makes sure that the counterweights on the crank shaft are equal to the weight of the pistons, rods, pins and any other weight attached to the crank. The weight of oil can even be accounted for in hi-perf and racing balance jobs.

The rotating assembly should be balanced any time you change the weight of the compenents. So if you buy a non stock crank, you should get it balanced with the other parts you plan to use, other wise the crank counter weights may not weigh the same as the reciprocating parts.

Local shops in Seattle charge anywhere from 150-300 bucks depending on the engine, complication and how thourou they are.

1988 Pontiac Fiero, engine transplant underway.
2004 ECOtec, built and boosted

firebug wrote:so do you still have to balance the assembly when you buy the JBP lightened crank??

Nope. Lightening, balancing, and knife-edging are all separate jobs from JBP with the core charge. However, given the entire idea of having your crankshaft worked, it's best to go with all 3 like I am.




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