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for single cylinder,
$ ^ H, I& C4 g1. Weigh the rotating parts (bottom of connecting rod, lower connecting rod bearing, counterweight pin); K, B" k' S9 @8 m; g" }) x
2. Weight the reciprocating parts (piston, rings, wrist pin, top of connecting rod, top connecting rod bearing)( J7 @) K5 n' u( \6 @8 {
3. Use 100% of the weight from #1 and 50% of the weight from #2.
( H% Y2 Q; `( R: O4 c% N8 F4. multiply result of #3 by 50% of the stroke length to get the torque needed for the counterweight! l; I; ]; _) p: U
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