I think what he is saying is that the end of the fins, where the water enters is half blocked off, ie a sudden reduction in cross-sectional area.
There was a thread earlier which mentioned that various curved profiles would reduce the pressure drop associated with an orifice plate, allowing for a greater velocity.
Is this what you mean BB2k?
8-ball
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For those who believe that water needs to travel slowly through the radiator for optimum performance, read the following thread.
READ ALL OF THIS!!!!
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