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Pistons are usually balanced by other pistons, at least in 4, 6 and 8 cylinder engines.
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....at least in boxer configurations. The various masses rotate in unison, but they can trade momentum which results in internal vibration.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Have you ever thought about how much a rainbow weighs?
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Not much, they're pretty light
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