Cummins revealed last week at the Bauma show the latest generation of 4-cylinder QSB3.3 and QSB4.5 engines offering a simplified Tier-4 installation across a broad 75- to 160-hp power range. With an air-intake-to-exhaust aftertreatment system specifically designed for highly flexible machine integration, the 3.3-liter and 4.5-liter QSB engines are designed to help compact equipment more easily meet low-emissions regulations in 2012.
The 4-cylinder QSB engines operate as integrated Tier-4 emissions systems with Cummins Compact Catalyst exhaust aftertreatment, shown for the first time at Bauma.
Cummins also presented its new QSX11.9 and QSX15 heavy-duty engine duo, featuring Cummins Xtra-High Pressure Injection fuel system and a variable geometry turbocharger. The 11.9-liter and 15-liter QSX are supplied as fully integrated air-intake-to-exhaust aftertreatment systems to meet 2011 EPA Tier 4 interim and EU Stage IIIB regulations. The engines use a Cummins particulate filter to reduce particulate matter emissions by more than 90 percent and incorporate a cooled exhaust gas recirculation system to reduce oxides of nitrogen (NOx) emissions by 45 percent, the company said.