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The Rotapowers rotor housing (trochoid) is aluminum. Is the trochoids interior surface coated?

April 26, 2017aluminum Coated HOUSING interior rotapower rotor trochoid

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The Rotapowers rotor housing (trochoid) is aluminum. Is the trochoids interior surface coated?

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Yes, the production version of the engine is plasma spray coated with a chromium carbide. We have also looked at new types of coatings, including an aluminum oxide ceramic type finish. The aluminum oxide is a proprietary formula and deposited by electrochemical process. This oxide surface has a friction coefficient approximately 1/3 of chromium carbide.