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as if the crankshaft of a boxer-twin engine did not include counterweights, the mass of the crank throws located 180° apart would cause a couple along the axis of the crankshaft.
* Lateral motion in counter-moving pairs of assemblies, such as a centre-of-mass height difference in a pair of piston-connecting-rod assemblies. In this case, a rocking couple is caused by one connecting rod swinging left (during the top half of its crank rotation) while the other is swinging right (during the bottom half), resulting in a force to the left at

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