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If slowing down the flow improves cooling we would always want to under drive the water pump.  Engines make heat, and the more cool water it gets the cooler it will run (as long as the rad can take the heat off). Ideally you would have a pump moving a lot of water at low engine rpm and zero load to cool it the most efficiently.


 In the top is common in FR cars for purging reasons and so high pressure goes in the top of the rad and low pressure out of the bottom where its picked up by the suction of the water pump.  Not familiar with the big picture on a MR layout.


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