check the guage and probe for accuracy!
Good Luck,
Mahlon
Yes, thanks, I did verify the probe vs a Fluke probe. Put both in water and slowly brought to a boil. They correlated within a degree or two.
There is another change that happened since last summer - I switched from Exxon Elite oil to Philips Cross Country 20-50. I'd run EE since around 2003 or so.
The little bit of research I did showed that the heat capacity of mineral should be slightly
higher than synthetic, but only slightly. What I could not find is how the shear generated heat, at operating temperatures, might compare. Oil gets heated not insignificantly between entering a journal bearing and leaving it. I could perhaps find the viscosities vs temperature of the two, and calculate it for varying assumed bearing clearances. I might have to consult my machine design book, as I haven't done one of those calculations since about 1980...
I've made several additional flights since flushing the cooler, but no real change. Last week I was cruising at 6500', OAT 72F (surface temps 88 @ 1400msl), temp peaked at about 208 during the 120-130 kias climb, and stabilized at 195 or so 5 minutes after leveling off. All are acceptable temperatures. It was the change from the previous 18 years that got my attention.