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The Australian concept car "aXcessaustralia II" is a serial hybrid car of the so-called "New Generation Hybrids." Its internal combustion engine drives an electrical power generator. The wheels are driven by the electrical traction motor only, which receives its energy from a combination of batteries, capacitors and the electrical power generator. In a drivetrain, which consists of a combustion engine, a generator, a traction motor, two different systems for electrical energy storage and the necessary electronics to apply the most fuel efficient power strategy, all components require an extremely high degree of weight optimization to avoid offsetting the fuel savings achieved with the system by an increased overall vehicle weight. They also need to be extremely efficient in themselves.

The fundamental differences between conventional crank and connecting rod internal combustion engines and the CMC Scotch Yoke family of engines are described in some detail. The advantages of the CMC design are also described and explanations given for the real and potential gains when installed in a motor vehicle. Some detail is also given of the development history and the solutions to some of the problems encountered.