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Low pollution emissions of stratified-charge engines and fuel economy of Diesel engines were incorporated into a stratified-charge Diesel engine with direct fuel injection. Tests and evaluation of this engine form the basis of the investigation. The paper is divided into two main parts. The first describes particular components and parameters: combustion chamber, injection jets, combustion air spin, timing, partial carburetion during optional gasoline operation, and throttling of intake air. The second part discusses these individual topics in light of the test results.