Crank balancing

[p0wersteer]

Dear experts,

If I'm replacing my piston and con-rod to forged lightweight components in my inline 4 cylinder engine, do I need to lighten the crank's counterweights as the reciprocating weight has dropped?

 

[GregLocock]

No. The ratio of counterbalance to reciprocating mass is a very woolly number. However there seems little point in fitting lightweight parts and then not taking advantage of a decrease in mass elsewhere.

Cheers

Greg Locock


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