Reciprocating Weight

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Reciprocating weight is any weight which reciprocates, or moves back and forth repeatedly. Pistons and piston rods are examples of parts which are recipricating weight.

Although most cars have piston engines, which have reciprocating weight, it is an undesired waste of energy, which reduces engine power and causes vibrations. Lightening these parts reduces reciprocating weight, which is beneficial for engine performance, as long as the part can withstand other forces applied to it.