Perry Mick wrote:

I moved the oil cooler inboard to the armpit location and closed up

the

holes in the cowl on top and bottom. Weather opened this morning so I

could

climb to 4500 feet. Cruised around at 5400 RPM, oil temp 180, coolant

temp

1/4 on the idiot Mazda gauge. 13C morning. I have never seen temps

this

low

at this higher power setting. Lesson learned: do not use a 12A oil

cooler on

a 13B, even if it looks the same. Hopefully I can fly around now in

the

hotter climates next summer. Attached are some photos.

Notice in the photos also, that I lowered the coolant rad leading

edge,

the

air is split about 2/3 to the rad and 1/3 over the engine and finned

oil

pan. The rear of the coolant rad is raised slightly to improve flow

into

the

ductfan. After moving the oil cooler inboard and closing the cowl

holes

I

gained another 50 RPM on climbout, 5270 now at 90 knot climb. The

ductfan

inlet seems to be very sensitive to obstructions.

Perry

Did you notice any loss or gain in top speed?

Paul Lamar

All right Perry!  Much better sounding numbers.  FWIW,  every time I've
tried routing air over engine, oil pan, etc,  the cooling was minimal and
the drag penalty was high.  Never saw a significant improvement with

finned

pans, finned oil filter housing, etc.
My conclusion was that every cooling  CFM not routed through a rad or oil
cooler is a waste.
Tracy

Thanks Tracy, yes I saw very little difference when I improved the airflow
over the finned oil pan. The most drastic improvement ever was just changing
from the 1982 oil cooler to the 1986. There HAS to be something different
inside that 1986 cooler.

Perry

 
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