In the spirit of learning from other's trials.
Here is a picture of Ed's original system.
Problems in this picture ignoring the scoop, duct type and size
for the moment are:

A. Cooler appears to be too close to firewall to allow air to freely
escape out the back side. The picture may be deceptive on this.

B. Transition from round duct to cooler is not a smooth bell shape.

Ed, I vaguely recall that you improved the transition from duct to cooler.
Did you? If so do you have that picture?

Paul Lamar

Yes, Paul

    I tried a bit of most everything, each was an improvement over what I
had previous which went to 240F on the first flight.  Clearly the air that
was flowing was only going though a corner of the cooler.  The photo
attached shows the plenum I later built with a 5" inch dia duct for the air
with the snorkel inlet you suggested (this was modification no. 4).  This
mod permitted me to fly except on those days when temps when above 90F then
it was on the boarderline.  But, this was certainly better than the orginal
plenum and 3" duct.  I suspect poor air exit and perhaps the cooler were
part of the problem on this later mod.  I would have kept working at it,
but, after Jim Mosur reported droping his oil temp 40F with the Mazda cooler
stuck under the chin, I adopted that and now have no cooling problems.

Ed Anderson

This could be improved further with a bit more work IMHO. The transition from five
inch duct to cooler could stand to be a bit more bell shaped. Also a double
wall SCAT flex duct would improve pressure on the face of the cooler. In this 
picture the cooler looks to be far enough away from the firewall. The exit duct 
would be unnecessary but a streamlined opening on the bottom or side of the fire wall 
and an exit cowl flap would help greatly. Ed currently uses louvers in the side
of the cowl for this purpose. They work of course but I suspect the cooling 
drag would be lower with a proper exit squirter.

Paul Lamar
 
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