Hi Will,
The two books I recommend are:

Aerodynamics of Propulsion. D. Kuchemann & J. Weber McGraw-Hill Book Company
Inc. 1953 Lib. Of Cong. Card # 52-6541 The bible of the aerodynamic design
of scoops and diffusers. Also covers ducted propellers. Out of print. Hard to find.

Compact Heat Exchangers. W.M. Kays and A. L. London Kreiger Publishing
Company. Malabar Florida. 1998 The bible of heat exchangers.
Some work on ducts (called headers in this book). Very comprehensive.

Every few years the American Society of Mechanical Engineers holds
symposiums on heat transfer. Same for the Institute of Mechanical Engineers
AKA IMechE London and the SAE. Lately the automotive industry is getting
so competitive this kind of info is drying up.

Here are a few excerpts. The Kays and London simple wedge shaped diffuser seems
to be the best for mounting the rad under the cowl. More in the next message.

Paul Lamar

Here is a rough suggestion for a cowl Will. This could be a bit pointyer
by sucking the rubber motor mounts in a bit. Stock 5.5 inch wide Mazda oil
cooler alongside a 15 inch wide water core. Both about 24 inches long over all
and about 2 inches thick. Two pass rad to simplify the plumbing. The duct should 
have more of a trumpet shape along K&M principles. Double diffusion. K&M combined 
with K&L wedge. This fits a Tailwind more or less. Tailwinds have tight cowls.
 
Paul Lamar
 
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