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The application of lightweight materials for new crankcase concepts implies comprehensive design considerations to achieve weight reductions as close as possible to the potential of the selected material. A specific approach for inline and V-engine crankcase concepts is discussed in detail. Engine weight reduction can also be achieved through "Downsizing." Modern technologies applied to existing engine concepts increase the power-weight ratio, the engine''s capability and therefore its marketing value. The use of lightweight materials for diesel and gasoline engines within one engine family allows a combined production and a less costly machining. Aluminum and magnesium alloys are, due to their high relative strength (tensional strength and e-modulus divided by their material densities), suitable for weight-reduced components which need to be designed for a specific target strength.