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I am modifying the cowling for the Tailwind.
The air inlet holes are 2 5/8"s x 7.5"s for a total of app. 21.5 sq.
inches. x 2 for a total of 43. I am looking at a 5 inch round hole
which is the size that Same James is using for the O-320's, which
would make the diffusers easier to fabricate. The round 5 " hole has
approximately 19.3 sq inches x 2 for 38.6 sq. inches total, if my math is
right. Is this a ball park figure for the water coolers (GM evaporators)
on the Mazda 13 B engine. JohnD
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