.  Most importantly, do you believe that the stock

oil cooler will be enough to handle from 200 to 240 HP?

Ken Powell

It has these trick turbulators inside the oil tubes I think.
I am prepared to go with something else if it does not work.
IMHO I have yet to see a perfect oil cooler duct however.

Paul Lamar

tparkes:First tparkes:Last wrote:

Ken,

If you're worried about oil cooling 200 to 240 HP, what's to be done with
a turbo 20B producing over 300 HP?  Perhaps I can squeeze two stock Mazda
oil coolers under the cowl of my Lancair ES (one on each side of the
lower cowl), but for now I'm going with one.  It is plumbed but has yet
to run.

Paul,

I'd like to build your "perfect" diffusion duct for my oil cooler, but I
can only approximate such based on previous discussions and some of your
rough sketches.  My plan has been to maximize airflow through a NACA
duct/ external scoop, but the Mazda cooler's length doesn't leave
sufficient room for a properly sized NACA scoop (over 6" wide and 14" in
length), and related ducting, unless the scoop extends virtually all the
way to the lip of the right cowl air intake--around the curve of the
cowling.

I don't hold much hope for a stock 13B oil cooler on a turbo 20B. I would look
for a large more or less square truck oil cooler of some sort. I think that is
about the only place you will find an oil cooler large enough. Perhaps 
two Nascar oil coolers. I would then mount them like Jim Rahm did with his
rads and intercoolers in his Lancair IV P. I think that is your best bet.

Perhaps you could suggest an altervative scoop design?  Also, do you have
any specific dimensions for the "pinched in" area of  a diffusion duct
where the airflow nears the narrow end of the ducting, per your earlier
sketch?

A round snorkel type air intake somewhere below the prop would be best
for a stock 13B I would guess. Similar to what Finn did with his
stock 13B oil cooler.

No I don't and I have not experimented with a stock oil cooler.
I could if I had the time I guess. I have a furnace blower, wind speed meter
and a stock cooler. My gear box and EFI is coming in a few days so I am 
running out of spare time. I am also building a P-port system for Ken.

Incidentally, the oil cooler is mounted on the right side of the engine
compartment, angled about 20 degrees from the longitudinal axis of the
aircraft as you move front to rear.  Airflow will enter near the right
front corner of the cowl, flow through the diffusion duct and then dump
from the oil cooler into the lower cowl immediately in front of the
exhaust tunnel/ cowl flap area.

Tom Parkes
Lancair ES, 80% done, 90% to go.

 
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