What is wrong with these cooling system designs?

Paul,
 If the question wasn't rhetorical, there is no diffuser prior to the face of the heat exchanger. The turbulent entry and "dead" corners will reduce the effectiveness of the heat exchanger. Better
would be to angle the heat exchanger and use the wedge style feed with a diffuser tapered to meet the intake.
Bill Jepson

You also get a B Bill :)  To be fair there is some subtle factor that just
recently crystal clear to me again. Hint it affects air cooled engines as well.

Paul Lamar
 
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