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Basic differences between the major diesel combustion systems are briefly discussed. Design details are given and the combustion process of the latest Hispano-Suiza combustion chamber is described. Development problems and their solutions of this combustion chamber in the DH-3000 engine are summarized. The relatively clean exhaust, in comparison with other engines, is a particular advantage of this combustion system and is demonstrated on the basis of test data.

The increasingly important role of fuel in operating expenses has led diesel engine designers to make every effort to decrease specific fuel consumption. This factor cannot be ignored, since S.F.C. is a top priority when users or shipbuilders choose a new engine.