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The present paper describes the modification and conversion of the constant speed DI diesel engine to mechanically operated gasoline direct injection engine (GDI). The gasoline fuel was supplied to the fuel injector by newly developed GDI fuel injection component. Engine head was modified to fix the spark plug and fuel injector at proper position. Compression ratio was changed to operate on GDI mode. Experimental investigations were carried out to optimize the fuel injection and spark ignition timing. Optimized engine achieved low brake specific fuel consumption, maximum in-cylinder pressure, minimum cycle by cycle variations and maximum heat release rate. The study shows optimum compromise between engine performance and emissions was achieved at optimized injection and ignition timings. Study also shows that the engine power was increased by 16.5% than conventional DI diesel engine. The NOx and smoke emissions from mechanically operated GDI engine were observed to be less comparing to diesel engine used in agricultural applications.

Investigations on High Performance and Low Emissions GDI Engine used in Agricultural Applications in India