Jerry Hey wrote:

snips ....

I am  skeptical about the need for intakes that are 25% of the surface
area of the rad or oil cooler.   According to that rule, the Mazda stock
oil cooler would require about 22 sq. in. inlet.   Inlets for  typical
radiators would have to be 100 sq in or more total.   Since there are
Mazda powered  RV  that are flying with  with the  stock cowl inlets (42
sq in total), the theory is having trouble with the facts.   ( Sam James
is producing RV cowls with round cooling inlets that are only 4"
diameter for the 0-320.   That is 26 sq in total inlet for an  0-320.
These work.)

  I have an alternative  inlet scheme for the oil cooler that  provides
more inlet area by dividing the intake plenum in half and feeding each
half from separate 3" inlets.  This is easy to do in my situation.   I
am planning to  use a similar design (two smaller belly scoops to a
divided plenum)  to feed air to the  fuselage radiator.      Jerry

Before I committed myself to making them smaller I would mock up
the duct system and high speed test it with a truck or minivan and see
what kind of dynamic pressure recovery you get. This sort of thing
can be expensive as you could damage your engine in the air before
you can get it back on the ground in the event of an engine overheat.

Paul Lamar
 
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