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Very interesting findings Rusty, I'll be very interested in
the flight test results. Another possibility of where the temp increase
(with higher viscosity) is coming from is the gear drive. The good thing
about planetary drives is the very high strength from all those gear teeth in
mesh. The bad thing is the higher losses from shearing the oil in all
those gear teeth. I didn't think the difference would be that much
but I never tested. I've always used 15-50 Mobile 1 but will try a batch
of 5-30 on the next oil change. Synthetic is my choice because of the much
higher shear strength.
Tracy (running the generator)
This
just gets more interesting by the day, particularly with the temp comments that
are coming out from Steve Brooks and others. Also thanks to Dale (the
closet chemist <G>) for that synthetic oil lesson. I guess I
never knew why synthetic was supposed to be so good. I really
can't wait to test this in flight, and I still hope that will happen this
weekend. Man, if I could just get a 10-15 degree decrease in climb
oil temp, I'd be in good shape. If this gets me close, I noticed
Mobile 1 makes a 0w20 :-)
Cheers,
Rusty
(already working on rudder and aileron repairs)
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