snips:

Perry:  I'm convinced that stock Mazda oil cooler form factor is just

no good for

a tandem seat

airplane. Don't mount it longitudinally like I did, it just doesn't

work.

It only works if

you can mount it face flat into the wind like it is in the car, or in

a

side-by-side plane

like Ed Anderson's.

Thomas Parkes wrote:

Perry:

I appreciate the challenge you face in cooling your oil.  Your pusher
configuration is especially challenging, what with the armpit scoops and
possible pressure ahead of the ducted fan.  One shouldn't necessarilly
conclude, however, that a Mazda oil cooler cannot be made to work when
mounted longitudinally.  Several tractor engine installations have been
moderately successfull with longitudinally mounted coolers.

My Lancair ES has a longitudinal Mazda oil cooler installation.  Its
original  NACA duct inlet was successful up to OATs of 80 degrees F,

dispite

the questionable use of a NACA duct for oil coolers, and dispite the

fact

that the engine is producing close to 300 HP at 32" MP.  When I recently
modified the scoop into a modified bayonet layout, oil temperatures were
reduced approximately 10 degrees.  I flew today at an OAT of 93 degrees.
Max oil temp briefly reached 220 degrees, then gradually retreated to

the

mid 190 range at higher altitudes and 30" MP at 5500 rpm.

Your ducting problems are far more complex than mine, but I would be

careful

discarding a reliable Mazda cooler, especially since we know of at least

two

aftermarket cooler failures (Chuck Harbert's Velocity) with serious
consequences.  Like you, I'm still experimenting and trying to optimize

the

cooler ducting.  Good luck!

Tom Parkes
N44AZ --31.3 hours down, 8.7 to go, but who's counting.

What is amazing is that Greg Richter's Cozy is making 300+ HP and using a
stock cooler.  It works!  Attached is a photo from John Slade's, (Cozy MKIV
#757) great web site: http://kgarden.com/cozy/chap23c.htm

Ernesto

We are beginning to suspect it has something to do with Perry's
use of the stock exhaust manifold not blocking the exhaust from
heating the block on the cool side.

Paul Lamar
 
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