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I concur with Bob. My oil temperature is on the low side in all
but the hottest 3 months of the year. It runs about 180 to 200 degrees
most of the time. In the summer months it runs about 200. Extended
climbs don't seem to raise it much.
The oil cooling system includes two, 5 inch round oil coolers, one on
each side, mounted on the engine mount, each with its own Naca duct inlet.
The Naca ducts are a little larger than the cabin inlet ducts and have 2
inch scat tubing 6 inches long on the inlet side, and 4 inch scat tubing on the
outlet side. The outlet tubes terminate near the rear lower cowl outlet
area. The size of the Naca inlet ducts (inlet area) was determined by the
area of the 2 inch scat tubing.
A few weeks ago, I blocked off one (left side) oil cooler inlet. In
climb and in flight, the oil temperature wasn't any different. Still
low. I plan to block the right side oil cooler inlet on my
next flight to compare temperatures.
Gary Edwards
N21SN
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