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I lke the newer design. It'll cool itself better. Surprising the water pump turns so easily by hand. Suggests that your experiement might show relatively little to be gained? How much load could an easily turned pump and its pulley be putting on the engine? Maybe the OEM pulley and its etra belt line puts as much load on the engine as the pump itself?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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