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Posted for keltro@att.net:
water side. For good power, 160 to 180 is just fine. The oil has been more like 190 to 200. That is not at all a problem as far as reliability is concerned. In fact, years ago when we didn't know any better, we ran up to 240 degrees. We were not making much power back then so the rotor bearings didn't notice our folly. It is a problem from the power point of view. any oil temp above 160 is costing a little bit of power. The cooler the chamber, the more fuel/air will fit in it. The engine builder told me that, and it sounds right to me. We run 40wt synthetic Redline racing oil. We have lost Lynn E. Hanover
Lynn,
With your experience with oil temps and its effect on rotor brgs as a guide what do you about the usefulness of HI temp coatings (rotor faces) as abvocated in recent posts to reduce rotor brg temps? I fully understand this is not a real problem at the power and RPM levels we normally use in our aircraft.
Kelly Troyer
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