Cummins to Introduce Tier 4 Engines

Columbus, Ind.-based Cummins Inc. will introduce the next generation QSL9 engine platform ready to meet EPA Tier 4 Interim and EU Stage IIIB off-highway emissions at the Intermat Show in Paris, France, in April. The QSL9 will be showcased as a fully integrated air-intake to exhaust aftertreatment system with all Tier 4 technology enablers designed and manufactured by Cummins. Cleaner, more efficient combustion reduces QSL9 fuel consumption by up to 5 percent, dependent on rating.

The QSL9 increases top-rated power to 380 hp with peak power rising to 400 hp at a lower rpm in response to high work load demands. This compares to a Tier 3 top-rated power of 365 hp with a rated peak power of 375 hp.

The 8.9-liter Tier 4 platform incorporates Cummins’ XPI Extra-High Pressure Injection fuel system, which represents the latest development of common rail capability. The XPI system enables multiple injection events with high fuel injection pressure across all engine rpm speeds, resulting in cleaner combustion and improved engine response. The fuel system is complemented by a Cummins Variable Geometry Turbocharger with a sliding-nozzle design. This continuously varies the air-flow boost to precisely match engine rpm and load demands.

"Our customers can be confident in the capability of Cummins to not only meet the stringent EPA and EU emission regulations in 2011, but to achieve these regulations with better performance and lower cost of operation," said Ric Kleine, vice president, Cummins Off-Highway Business.

The QSL9 utilizes the same Tier 4 emissions architecture as previously announced for the smaller QSB6.7 and larger QSX engine. An integrated Cummins particulate filter enables a 90-percent reduction in particulate matter and a cooled Exhaust Gas Recirculation system reduces oxides of nitrogen by 45 percent. The particulate filter replaces the exhaust muffler with equivalent sound reduction and is rugged design hardened to withstand severe shock loads and vibration.

Air intake flow for the Tier 4 QSL9 features a high-performance Cummins Direct Flow Stage IIIB air filter by Fleetguard providing a 35 percent smaller installation profile than typical engine air filters, yet retaining the same filtration efficiency. This is accomplished by creating a direct flow path through the filter media which is packaged in a rectangular configuration rather than a conventional cylindrical shape.

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