Cummins Inc. received certification from the Environmental Protection Agency and the California Air Resources Board for its ISX11.9 diesel engine.

The new ISX11.9 is an expansion of Cummins heavy-duty engine product line and will commence with full production in August. Certification of the ISX11.9 rounds out the complete lineup of Cummins engine offerings for on-highway applications for 2010.

The Cummins ISX11.9 utilizes common components with the ISX15, which is used in the Class 8 commercial-vehicle market, including an enhanced cooled Exhaust Gas Recirculation system, a single VGT Turbocharger and the proprietary XPI fuel system. Like the lineup of on-highway Heavy-Duty and MidRange engines, the ISX11.9 will also utilize Cummins Aftertreatment System with Selective Catalytic Reduction technology.

Featuring better pulling power, excellent driveability and stronger clutch engagement torque, the ISX11.9 is designed for rigorous duty cycles, including those for work trucks such as dump and mixer trucks, and refuse applications. Additionally, a full suite of horsepower and torque ratings are available for fire and emergency vehicles, recreational vehicles and motor coaches as well as tanker and day cab operations in Class 8 trucks.

"Cummins is excited about the expansion of the heavy-duty product line to include the ISX11.9, which is ideally suited for vocational and specialty vehicles," said Ed Pence, vice president and general manager, heavy-duty engine business. "Customers can be confident that the ISX11.9 is the better choice for these applications, which require strength, performance and maximum uptime in their operations."

Cummins will offer horsepower ratings of 310-450 (231-336 kW) and torque ranging from 1150-1650 lb-ft (1559-2237 N•m) for the ISX11.9, depending upon vehicle application.

Optional features include single- and dual-cylinder air compressors, front engine power take-off and the enhanced Cummins-designed rear engine power take-off for customers who need to maximize payload.