Technical Features
The engine has a single rotor with a capacity of 497 cc. The rotor spins on an eccentric shaft in a peritrochoid (Mazda uses an epitrochoid) chamber, giving three rotations of the crankshaft for every 360° of rotor travel. Compression ratio is 9.4:1. The eccentric shaft runs on plain bearings, which were better than rollers for heat dissipation. Combustion sealing utilised Apex, corner and side seals. At the three rotor apexes, tip sealing was accomplished with a three-piece seal tensioned by a blade spring. Apex seals were made of a special material known as Ferro Tic, which was a combination of sintered ferrous alloy and titanium carbide. The surface of the trochoid chamber which the apex seals rubbed along was coated with a CEM (composite electrochemical material) consisting of nickel silicone carbide. Side sealing used one blade-like seal and spring for each rotor face on each side (six side seals in total). Corner seals and springs finished the isolation of combustion. Blow-by gases are recirculated into the combustion process. The rotor spins backward in relation to the motorcycle. Primary power transfer to the clutch and transmission is by duplex chain.
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