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
For everyone who thinks ceramic seals are fragile, we need to remind them these are not Grandma's dishes. Proper alumina ceramic is fairly tough. Silicon nitride ceramic is almost twice as strong as alumina. Something for all the detonation worriers to think about, when silicon nitride balls were first used in bearings they had trouble, with the silicon nitride balls DENTING THE STEEL. Not with the balls shattering. My dad was a ceramics expert. He said, "people go to alumina ceramic when they have a problem with strength of other materials at high temperature. They go to silicon nitride when they are in a hole alumina can't get them out of!"

Bill Jepson



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