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The SCCA (Sports Car Club of America) allows the use of synthetic rubber belt CVT transmissions in 3 classes: F-500, D-Sports and C-Sports. A rubber belt CVT system has been developed that can successfully transmit the 185 horsepower required to race competitively in the D-Sports class. This paper covers the development of the rubber belt CVT Transmission from a power level of 125 HP in 1986 to successfully racing with 185 HP in 1996. During the 10 year period the output level was increased by 50%. Advances in belt construction and component design to improve efficiency are described.

The SCCA (Sports Car Club of America) D-Sports class allows 2 stroke engines of up to 850 cc and a maximum of 4 cylinders. An 850 cc single crankshaft V-4 two stroke engine has been designed, developed and successfully raced in the SCCA D-Sports class. This paper covers the design philosophy and development history from prototype engine to a reliable power unit that can win major SCCA national races and compete a full season without failure. Piston and cylinder design, crankshaft development and design of intake and exhaust systems that produce acceptable component life and competitive power output is described.