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

Perry,

Although I'm always interested in your progress, I didn't realise you were
trying to use a 12A oil cooler on a 13B.

Previous discussions suggested they weren't up to the task, but I assumed
you thought it would be OK with reduced RPM?

Just imagine how much cooler a 12A will run with a 13B cooler - I will have
to remember that!!.

That duct looks like a fighter jet intake, so pulling in the boundary layer
doesn't seem to affect it ?
George (down under)

I would not say that George :)

BTW I am not sure that is a 12A oil cooler. My 83 RX7 had a water to oil cooler
under the filter. 

Paul Lamar
 
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