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


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