Paul wrote:

You know now I am not sure. I thought it was in the Lemans engine SAE paper but it
may have been another Mazda SAE paper. The Lemans engine had cermet coatings
on the aluminum end and rotor housings. On a 13B it must be done only on the
rotor. If any of it comes off you are in big trouble. Little more power
a little less heat loss and a little better BSFC. It will be hard to measure
unless you do back to back dyno runs.

Russell Kent wrote:

Any reduction in thermal load will be limited to the oil.  The rotor faces are cooled
(internally) by the lube oil.

Russell Kent

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