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I collected some temperature readings in the duct leading into the oil cooler, with and without the deflector.The temperatures were, on average, 20 degrees F above ambient with the deflector and 30 above without.Different altitudes produce scatter, but on the whole the points line up fairly well.
This is an inefficient arrangement, obviously, but by using low rpm (these tests were run at 2,300 rpm, but I often go lower) I can open the throttle fully at 8,000 feet or so.
Today the unpredictable #1 Lowrance worked, to some extent.
Now that I have replaced its internal battery, it remembers that it is supposed to be producing NMEA output for the autopilot coupler.
The first time I tested it in flight I got the impression that it had had a remarkable effect; but as time went on the effect appeared to vanish.
The only way I will know for certain is by measuring the temperature in the duct with and without the deflector in place.
I recorded induction air temperature at 20, 25 and 30 in. I had intended to finish the series at 16,000 feet, but it became apparent that the temperatures were getting quite high and I did not want to venture past 200 deg. The astute viewer will wonder why the temperature rise is so large even at low manifold pressure and low altitude, where no compression at all should be taking place.