X-Mozilla-Keys:                                                                                 
Quote from:  http://www.stewartcomponents.com/techtip5.htm

" Thicker radiators do have slightly more airflow resistance than
thinner radiators but the difference is minimal. a 4" radiator has only
approximately 10% more
airflow resistance than a 2" radiator."


Quote from: http://www.sdsefi.com/air10.html

"I also did pressure drop tests on the cores using my cylinder head flow
bench. The thicker the core, the more resistance to airflow through it.
With the cores mounted over the exhaust port of the bench flowing 160
SCFM (area was 9.6 square inches), the thin
Mazda core only showed a drop of 1 inch of water across it. The GM core
showed 5.5 inches across it. It would appear that pressure drop is
fairly proportional to core depth with the GM core having about 5.8
times the depth of the Mazda rad. For comparison, I also flowed my 3.5
inch thick Spearco intercooler core. It showed a drop of 7.5 inches
across it."

Frankly I would believe the second quote before I would believe the
first.
On the other hand whoever wrote the SDS stuff failed to consider a thin
radiator in
an oblique block or angled configuration and erroneously concluded that
thick is better because it has lower frontal area.
 
Paul Lamar
 
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