Cummins’ QSB3.3 and QSB4.5 to meet 2012 emissions requirements

Cummins’ 4-cylinder QSB3.3 and QSB4.5 engines will meet EU Stage IIIB and U.S. EPA Tier 4 Interim off-highway emissions in 2012 across a broad 75- to 160-horsepower range. The next-generation engines retain the same 3.3- and 4.5-liter \platforms and will be supplied as a fully integrated air-intake-to-exhaust system. The engines achieve very low emissions by using cooled Exhaust Gas Recirculation (EGR) for NOx control and exhaust after treatment for removing particulate matter. The particulate after treatment unit designed by Cummins for the Tier 4 Interim QSB3.3 and QSB4.5 removes more than 90 percent of particulate matter. The unit replaces the muffler in the exhaust stream and offers equivalent noise reduction.