Keep in mind that the 5" inlet in the cowl is not the final size of the
duct in the Lycoming application. An aluminum inlet & duct
measuring between 3.75 and 4" is inserted into the inlet so the actual area of
the inlet is significantly smaller than 5". The 4" size is used on 200 HP
IO - 360 engines.
----- Original Message -----
Sent: Sunday, January 29, 2006 8:06
PM
Subject: [FlyRotary] Cooling air
inlets
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