V. E. Welch wrote:

Now THAT is starting to move us out of the realm of guessing and more into
engineering. :)

Thanks,

Vince

Vince you might also want to look at Marks' Standard Handbook
for Mechanical Engineers. Tenth Edition chapter four.

Lot's of theory but not much for nailing down radiators.
One of the problems we have is we don't have detail 
drawings on the radiators available to figure tube areas 
and heat transfer surface areas.

We are just going to have to construct some sort of test rig.

BTW I figured out how to cheaply load down  a pick up truck
at reasonably highway speeds. Use a drag racing brakeing parachute.
Build a pylon  in the bed of the truck to keep the chute from 
dragging on the pavement. You can restrict the opening of
the chute to change the drag. 

We can now use a Mazda rotary powered pickup 
truck or install a rotary in some other brand of truck.
Move the entire cooling system to the bed of the truck and
build full scale ducts. Drive at 85 to 100 MPH to test
the flow in the duct and the effectiveness of different 
radiators.
 
PL

 
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