FYI, at Deere we used Teflon coated O rings for the oil seals on the 580
Series (5.8 liters per rotor -- big engine!) with excellent results. I don't
recall if the base material was silicone or Viton, I think it may have been
Viton but I am really very fuzzy on my recollection...The 580 Series passed a
number of rigorous military tests (400 hour Nato, 1200 hour mission profile,
others) at a rating of 375 hp per rotor, 3600 RPM (engine was turbocharged,
direct injection operating on diesel or Jet A fuels). Later ratings were 500
hp per rotor and then I think slightly higher.

Jon Lauter
Rotary Power Marine Corporation
www.rotarymarine.com

It is interesting how these are made. They apparently start with teflon tubing and
apparently inject liquid silicone rubber and let it cure. Then the tube is
cut to length and glued end to end some how. The joint is a bit hard to see
...it is done so well. 

Paul Lamar
 
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