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Originally Posted by Isaac Zachary
If it reduces vibration without causing more friction, perhaps. But another variable we have to contend with is rotating mass. Rotating mass can help fuel efficiency in only certain rare cases, like when going uno and down a series of small hills. But in most other areas it hurts efficiency.
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I was mostly considering any counterbalancing effect leading to an improved smoothness, instead of an actual impact on thermal efficiency.
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I think once vibration is near zero then there becomes a point of diminishing returns.
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The only engine I remember seeing with a near-zero vibration was Chrysler's flathead-six. Sure it might not be so efficient at all, but its smoothness really impressed me.