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To meet future CO₂ emissions limits and satisfy the bounds set by exhaust gas legislation reducing the engine displacement while maintaining the power output ("Downsizing") becomes of more and more importance to the SI-engine development process. The total number of cylinders per engine has to be reduced to keep the thermodynamic disadvantages of a small combustion chamber layout as small as possible. Doing so leads to new challenges concerning the mechanical design, the design of the combustion system concept as well as strategies maintaining a satisfying transient torque behavior. To address these challenges a turbocharged 2-cylinder SI engine with gasoline direct injection was designed for research purposes by Weber Motor and Bosch. This paper wants to offer an insight in the design process. The mechanical design as well as the combustion system concept process will be discussed.

The newly founded Weber Motor AG launched an extremely compact and powerful 2 cylinder-4-stroke Multi-Purpose-Engine named MPE 750 with 750cc displacement. As first the member of an engine family from 1 cylinder to 4 cylinders, the engine is intended to be used as a prime mover for recreational vehicles, as an industrial engine but also as an automotive engine for niche-vehicles. The MPE 750 combines an extremely compact package with high specific output. Therefore it is able to replace the currently used 2-stroke engines in recreational vehicles, eliminating the typical limitations and drawbacks of a 2-stroke.