smokey_bear_40220(at)yaho
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 Posted: Wed Mar 22, 2006 12:18 pm Post subject: Soob cooling (was It Flew! Cooling) |
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Rick,
I should have explained more. Net is being wiped out
by thunderstorms here in S. America, so I kept it
short.
I was measuring the air temp out of the oil cooler and
comparing it to the OAT, which should be about the
same as inlet air. I wasnt comparing the Delta T of
the oil, just air. Havent tried oil temp drop yet.
My interest was to use the oil cooler as a cabin
heater by diverting the exit air and save the weight
of the cabin heater. (The oil cooler airflow is
seperate from engine air on my plane.) What I got was
only a 10 degree rise in air temps, which lead me to
believe I have plenty of airflow - maybe too much -
and not much cabin heating.
I agree with adding the thermostat bypass. I was
flying it in 60s temps last fall and the oil and
coolant were only 160 to 140 F in cruise. Had to
change the oil after that cross country, due to not
boiling off the water. It creamed a bit.
My temps go up rapidly and directly with OAT though.
90s OAT temps will raise oil and coolant by at least
30 degrees over 60s OAT. In cruise that is OK, but I
get too hot in taxi and in takeoff/climb. I intend to
address this with a variable exit. I have added a
fixed enlarged exit already to experiment with it.
Positive results, but draggy. Also like that new
waterless coolant....
Like John A., I had a moment of enlightenment when I
first ran the engine and found the oil cooler cold.
Reversing the lines to the oil filter cured that
one.... Grrrr Wish I built this before I needed
glasses.
I found that moving my cooler to the cowl outlet had
some unintended consequences. While it saved weight,
I had inadvertently reduced the cooling to my GB.
Also it reduced the airflow to the oil cooler more
than expected because I used the smiley face instead
of the higher origional inlet. That is how I learned
of the smiley face air pressure problem.
My peak oil temps for all flights have been 240, that
I remember. I tend to reduce power when it gets over
225. My coolant got above 240 on one very short
flight.  I shoot for 215 max coolant temp.
Kurt S.
--- wingsdown <wingsdown(at)comcast.net> wrote:
| Quote: | Humm, you mean from the inlet not OAT? The OAT is
not the starting
point. It would be the oil temperature drop from the
oil inlet to outlet
side. The air is being heated by the oil but has no
relation to what the
drop in oil temp is across the cooler. No doubt
there is a rise on both
ends. One thing I would recommend in an oil
thermostat like the one I
installed from Mocal. But like all things open to
another's perspective.
Mine worked very well and regulated oil temp great.
I think more
important than the size of the cooler is its
placement for air flow.
Going back, I am not saying the OAT is not relative
but for what your
looking for not so much now. What is you full power
climb peak oil temp and cruise oil temp?
Rick
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