Cummins QSL9 Evolves to Meet 2011 Emissions with Integrated Air-Intake to Exhaust Aftertreatment

Broader power capability extends from 179-298 kW (240 To 400 HP) incorporates XPI common rail fuel system.

Cummins Inc. introduced the next generation QSL9 engine platform ready to meet EU Stage IIIB and EPA Tier 4 Interim off-highway emissions at the INTERMAT Show in April.

Exhaust Aftertreatment System

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 283 kW (380 hp) with peak power rising to 298 kW (400 hp) at a lower rpm to respond to higher load demands.  This compares to a Tier 3 top-rated power of 272 kW (365 hp) with a rated peak power of 280 kW (375 hp).

The 8.9-litre Stage IIIB/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 very 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.    

“QSL9 ratings are broadened to take advantage of 8.9-litre displacement benefits with higher performance and fuel economy for 2011 low emissions levels,” said Ric Kleine, Vice President, Cummins Off-Highway Business. “The QSL9 will be used as a base to replace the 8.3-litre QSC and offers an even more attractive power solution for equipment manufacturers with lower operating costs.”      

“The QSL9 offers significantly more power flexibility for Stage IIIB and Tier 4 applications. A peak power output up to 298 kW (400 hp) enables the QSL9 to power equipment usually associated with larger displacement engines. With QSL9 power ratings extending down to 179 kW (240 hp) this brings the durability and improved torque of an 8.9-litre to equipment typically using lower displacement engines for Stage IIIA and Tier3.”

“Our customers can be confident in the capability of Cummins to not only meet the stringent EU and EPA emission regulations in 2011 - but to achieve these regulations with better performance and lower cost of operation” added Kleine.

Cummins Particulate Filter

The QSL9 utilises the same Stage IIIB / 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 an exceptionally 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.