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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.

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.