It's amazing how fast 130 hrs goes when you are having fun.:-) 

I took off the exhaust today and too a look.  One of the blades on the turbine wheel is gone, but the axle seems otherwise intact, though it may be off kilter and that is what is causing the resistance when I try to turn it.  So I am to sure if the problem was primarily the bearing, or overheat, or overspeed.  According to my calculations, turbine speed should have been well within the green area. (way down around 60k RPM - near the bottom of the chart.)

One difference with this fligh...  I usually run well lean of peak, but this particular leg I was running a little late so I decided to push it up a bit by running a best power setting.  I figured I was OK because I was high enough that I was only showing 21" MAP.  But the failure happened in descent when I kept best power as I came lower and the engine RPM came up to about 6300 (more exhaust available).

Combination of higher than normal EGT's and 'you number is up, turbo'???

Dave Leonard

Dave,

I follow your threads carefully as you have put so much into the Turbo installation, I don't know anyone who has done more but I'm sure there are, it's just we/I am not aware of them. From what your saying, I think your right on the money - heat is the killer (in this case).

 

I personally would like you to try something remote as per suggestions by others. I think Paul's idea is sound, but may be still to close to the heat for my liking.

George (down under)