Counter balance?

[robcas631]

I am wonder as to how one calculates the counter balance weight on the crank? Do you add the weight of the connecting rod + 1/2 Crank?

 

[Maryak]

Rough and ready........... the counter weights equal half the weight of the moving parts.

Best Regards
Bob

 

[MachineTom]

The answer depends on the configuration of the crank, and engine. Inline or V, what angle of Vee, plane of crank 1, 2, 3. On a single cylinder engine, counterweight = 100% of the rod +50% of the piston mass. There is really much math involved in setting the mass of the counter weigh, RPM is a large factor, rod lenght, on and on.

 

[robcas631]

Thank you!