Cummins is moving beyond powerplant production to offer a fully-integrated air-intake-to-exhaust aftertreatment system on its heavy-duty QSX engine that will meet Tier 4 interim off-highway emissions requirements effective January, 2011. Incorporating the XPI high-pressure common-rail fuel system, the Tier-4 QSX engine will increase displacement to 16 liters and output to 650 horsepower. According to Cummins, the particulate filter exhaust aftertreatment will reduce particulate matter emissions by 90 percent, and the cooled exhaust gas recirculation technology will cut oxides of nitrogen by 45 percent.
