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for single cylinder,
! P2 w) O9 X9 D0 q1. Weigh the rotating parts (bottom of connecting rod, lower connecting rod bearing, counterweight pin)9 P% ]9 g" L3 M7 V# h, C/ R
2. Weight the reciprocating parts (piston, rings, wrist pin, top of connecting rod, top connecting rod bearing)
+ _* H3 }7 |' U: c4 V: _4 V) V7 e! ^& m3. Use 100% of the weight from #1 and 50% of the weight from #2.
6 d! v" G/ K! N2 \3 |* N- Q' T% G4. multiply result of #3 by 50% of the stroke length to get the torque needed for the counterweight C8 w: C1 Q2 ?% _+ Y
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