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Originally Posted by BudmanV24
Has anyone noticed higher operating temperatures due to under-driving the water pump too? Or does the decreased load from spinning the other components at a slower speed make up for that? I don't think I've seen anyone discuss this.
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Tests by Flat6 indicate that engine temps run lower with the UD pulley. I don't know if it is due to impeller cavitation at higher RPM with stock pulley, or just a better heat transfer flow match.