" I asked Flow Kooler for a graph of their pump's performance over a wide range of rpm "
Basically George is right ... any pump should be supplied with a pump curve .. the needs of a PANTERA with radiator in the front and 20' of extra tubing and 90 degree turns adds to the head pressure and velocity needed to deliver the cooling water to the radiator and back .. the looks, feel, of a pump makes no difference ... especially if they have that steel blender looking impeller .. in the pump business we laugh at that ... a true cast impeller with vains is what you need. There is no comparison between the 2 .. technically if I had a lot of time I could test all three pumps on a bench and see what the flow rates are .. but would rather the manufacturers provide the curves.
Ron
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