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The supercharged diesel engine with a pressure wave supercharger (PWS) has achieved a high torque over the entire speed range in a quick response while maintaining the low fuel consumption as a small diesel engine. This is the result of adopting a high efficient supercharger based on the unique construction of PWS. Lower inlet and exhaust flow resistance, earlier inlet-close timing, etc., are specially important for engine with PWS. Another advantage is less unturned fuel emissions.