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Our digital scale reads down to the 1/10th of a gram. To ensure that the scale is calibrated correctly, we use a certified stainless steel precision weight.Once the parts were back, we were finally able to balance the pistons and rods. Here we are looking out for vibration caused by rotational imbalance. Since the engine is moving in a rotational motion, it experiences vibration much like a wheel. This vibration especially at 7,000 to 8,000 rpm can contribute to premature ring, piston skirt, and bearing wear. When revving up an engine with a base rpm of 6,000 to 8,000 rpm, the amount of centripetal force on the crank increases exponentially. This is a direct correlation with the amount of vibration experienced by the engine.