Hurley seals are used by most of the very powerful rotaries
used in drag racing cars. HP is in the range of 400 HP per rotor
or above. In fact Abel Ibarra turned me on to Hurley Engineering seals 
several years ago. Hurley was also the originator (as I recall) of grinding out
the Mazda rotor apex seal slot for 3 mm seals to better withstand 
inadvertent detonation and to refurbish worn rotors. 

Here are some pictures of Hurley seals.
First is a box of apex seals ready to ship.
Second is some flexible double side seals.
Third is a corner seal with small coil springs.
Very wrist watch like.
 
Paul Lamar
 
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