Cummins Tier 4 Interim Diesel Engines

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-hp (56 to 119 kW) power range.

The next-generation 4-cylinder QSB engines retain the same 3.3- and 4.5-liter proven platforms and will be supplied as a fully integrated air-intake-to-exhaust system. Very low emissions are achieved by using cooled Exhaust Gas Recirculation (EGR) for NOx control and exhaust aftertreatment for removing particulate matter.

QSB3.3 ratings extend from 75 to 110 hp (56 to 82 kW) for Tier 4 Interim, retaining the best-in-class power output for an engine of this size. The QSB4.5 occupies the 110- to 160-hp (82 to 119 kW) power band and will offer the same or improved torque delivery as the Tier 3 engine. Cleaner and more efficient combustion improves fuel efficiency by up to 5 percent compared to Tier 3, depending on rating and installation optimization.