I agree with the heat issues, because we found the 2 cycle
        engines needed hot plugs to keep from oil fouling.

        Paul, do I understand correctly that there is a certain amount of
        oil injected or mixed in, for lubrication purposes? Is that oil
        going past the plugs so fast that it is not a factor with regards
        to oil/soot fouling?

        I'm just trying to get my head wrapped around how differently the
        combustion works with a rotary engine so I can understand the
        physics a bit better.

        Steve Thompson


        Normally it is only one or two ounces per gallon. No noticeably affect.
        Up to 4 ounces per gallon is OK.  Surprisingly  cooling is the main concern.

        This chart is for the old cast iron seals. There is some R&D going on in the UK
        with no oil mixed for Iannetti silicon nitride apex seals. The fuel is the only lubricant.
        They are normally good to 1000 F while cast iron is limited to 500 F.

        Mistral did everything they could think of to fracture them but
        they were unable to damage them. Detonation and the whole nine yards.

        We have Iannetti silicon nitride seals in the time to climb engine.
        They are about $200 each and you need six.


        There are some turbo charged rotary engine builders in the world that still do not understand
        this and they are trying to use steel apex seals. Steel is hard on the chrome
        coating while the projected life of the Iannetti silicon nitride seals is 20,000 hours.
        Not  2000 hours! 20,000 hours.

        The Austro Wankel engine used in motor gliders have no TBO. Unlimited life.
        I have no doubt they are Iannetti silicon nitride seals.

        Silicon nitride ball bearings are widely used in F1 engines.
        Here is a bunch of specs on the ball bearings.

        Paul Lamar.

        Hi Paul, You mentioned that the TTC engine uses Ianetti ceramic seals. I have been researching that topic, a little bit. Some people indicate
        that they are good for NA engines only, of detonation being a real problem. Can you enlighten me and the group on your take, turboed versus
        NA.

        Steve Carlisle

         There are a lot of people out there with opinions.
         What are their names, what is their education  and what have they done?


         We have data to support their durability.

         Try 85 inches of manifold pressure.

         Paul Lamar


        Do they make those seals for 12a engine too?

        Richie Barrow

        I don't think so but you can try these people.

        https://lucky7racing.net/products/fc-fd-apexseal-ceramic <https://lucky7racing.net/products/fc-fd-apexseal-ceramic> <https://lucky7racing.net/products/fc-fd-apexseal-ceramic <https://lucky7racing.net/products/fc-fd-apexseal-ceramic>> <https://lucky7racing.net/products/fc-fd-apexseal-ceramic <https://lucky7racing.net/products/fc-fd-apexseal-ceramic> <https://lucky7racing.net/products/fc-fd-apexseal-ceramic <https://lucky7racing.net/products/fc-fd-apexseal-ceramic>>>

        Paul Lamar


        Richief,  this site lists ceramic seals, also for 12A,

        https://www.mazdatrix.com/b3.htm <https://www.mazdatrix.com/b3.htm> <https://www.mazdatrix.com/b3.htm <https://www.mazdatrix.com/b3.htm>>

        Steve Carlisle

   Thanks but wow,
   200 ea to now 300ea!



   Yes but the rest of the 12A was free :-)
   Are you building an airplane?

   Paul Lamar


Nothing with rotary engine is free  any more .
No aircraft yet .....only the engines mainly old 12a types

Richie Barrow

A light aircraft piston aircraft engine is $25,000 and up.
A Pt6 replacement of a TTC rotary engine is $250,000
Private flying is expensive.

Paul Lamar

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