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Reduction of soot and NOx emissions from a prechamber-type diesel engine is studied by employing both chemical and physical aspects of the fuel and induction method. Fuel modification was performed to produce several forms of composite fuel: solution of alcohol and gas oil (JIS No. 1); emulsification and mixture of methyl alcohol-gas oil prepared by off- and in-line fuel systems; and separate injection of fuels into the pre- and main-chamber.