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

Paul, your achieves are not in question, I am trying to understand the physics behind the controversy of ceramic versus std apex seals, and detonation. This controversy shows up in the rotary racing world. I have only one aviation related source to help me understand that issue.

Steve Carlisle

It is simple. At high boost and high temperatures iron seals tend to fracture.
Especially  if pre ignition occurs. High intake temperature can cause pre ignition.

There are people out there that are anti rotary. They will spreed any false rumors they can.
Fake news!

Paul Lamar.


       The Rotary Engine free News Letter. Powered by Linux. If you want off
       the list PLEASE let me know and I will remove  you.  ACRE NL web
       site. http://www.rotaryeng.net You Tube http://tinyurl.com/beqqxas
       Copyright 1998-2017 All world wide rights reserved.