Finding Balance (Part 1): The Basics of Crankshaft Balancing

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Machinists and engine builders have long been taught that, when balancing a crankshaft, its counterweights should equal the weight of the rotating mass, and equal half the weight of the reciprocating mass.

Machinists have used this formula to calculate bobweight for decades.

While this technique works extremely well for most street and race 90-degree V8 engines, the truth is it’s nearly impossible to balance acrankshaft perfectly. That’s because the balancer cannot account for variables like cylinder pressure, ring drag, rod length, counterweight phasing, engine rpm, stroke length, bearing friction, secondary vibrations, rocking couples, and static mass.

Read More 

Part 2 

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