The 2-cylinder or better 2-disc version of the ROTARY 49-PI is a version manufactured exclusively by Valentine Motors in the USA. All essential parts such as the rotor, carburetor, trochoid stator housing and bearings are identical to the ROTARY 49-PI version. A special center plate and a 2-part crankshaft were designed to create a 2-disk version. The center plate allows the trochoid stator housing to be screwed together force-fit at the front and rear, thus ensuring that the engine is leak-proof. Only tube pieces are mounted as silencers, which allow an application-specific design of a silencer system.

The exact release date and the number of engines available is unknown, but presumably only a few units were manufactured. Likewise, no specific performance data or speed-torque characteristics are known, so the technical data given below are estimates without any actual verification of the engine characteristics.

Further data can be found in the associated blueprints refer to.

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