When we ran the engine for the first time we noticed
   a distinct lack of boost. It did  not occur to us to take
   the turbo apart and check it. The turbine was missing blade
   area. This happens when a small foreign object goes
   through the turbine while it is rotating at 100,000 RPM.
   Nothing new here as the  CW R3350 TC would do the same
   thing when an exhaust valve broke up.

   When you just look at the exducer everything looks OK.
   We checked the compression on the TTC engine and it
   appears to have full compression on all chambers so
   it did not happen after we had the engine. I am building
   a Maximite rotary engine compression checker to get a better
   handle on that.

   Apparently, some time during the development process, an iron
   apex seal failed and took out the turbine. It is easy
   to forget and not check the turbine when that happens.

   Subsequently Iannetti ceramic apex seals were installed
   and they are cannon prof. Mistral intentionally detonated
   the engine and the Iannetti's  failed to break. The same thing cannot
   be said about the stock seals.

   A new ball bearing Inconel turbo cartridge cost $2400 so small donations
   would be welcome.

   Paul Lamar
   830 East Santa Maria Street
   Suite 303
   Santa Paula California
   63060

   Paul Lamar

   Paul, at the top of my 8000 RPM 3rd pull I indicate over 1000C egt but this just momentary compared to an aircraft's sustained climb out temps.  At those temps it doesen't take much FOD to destroy a turbine wheel.

   Do you have the dimensions of the wheels... looks roughly like a 82mm compressor and a 74mm turbine OD.

   You probably need just the cartridge.  See attached.

   Barry Bordes

   It is a GT42 ball bearing Here is a screen capture.
   It is the complete turbo.

   When they open I will check the price for just the cart.

   what is 1000 c in f?

   Paul Lamar


1000 °C is 1832°F.

Henry Nee




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