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DEUTZ has manufactured air-cooled Diesel engines since the 1940s. The basic design of some of the air-cooled engines in production today dates back to the 1970s, a time when fuel economy, reliability and durability were the greatest concern. Extremely stringent U.S. and European heavy-duty on-highway standards have been implemented resulting in very clean engines for truck and bus applications that are now in the market. Meanwhile, the U.S. EPA, the State of California and the European countries have developed (or are in the process of developing) exhaust emission regulations for industrial engines. These requirements are being finalized and will be implemented in the mid 1990s. It is very encouraging to recognize that there have been definitive steps towards an international harmonization of the emission legislation between Europe and North America.

This paper describes the development philosophy which served as a basis for conceiving a new family of modern diesel engines in the power range 10-53 kW developed at the Cologne Research Center of Klöckner-Humboldt-Deutz AG (KHD) over a period of four years. Furthermore, the technical highlights of these engines are discussed. The FL 1011 family comprises naturally aspirated 2, 3 and 4 cylinder engines and a 4 cylinder turbocharged engine. They not only continue the KHD tradition of air-cooled diesel engines but also implement new design technologies in the area of integrated cooling systems. It will be shown how modern component design have yielded a diesel engine family which, in addition to satisfying present requirements, fulfills future performance expectations of the market place.