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Impeller size
I repowered last winter going from the original 1986 Westerbeke 46 (with a bad cylinder) to a new Westerbeke 55 in my Cape Dory MS 300. I'm kind of surprised that the impeller on the 55 is only a small fraction of the size of the impelller from the old 46, maybe only 20%-25%. The old impleller from the 46 is larger in both diameter and width.
Do the water pumps on more recent engines operate at higher RPM's than older models? Does that account for the reduction in size? I was thinking that a larger engine would need at least as much cooling as a smaller older model.
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