Sources: Cummins Inc., Columbus, Ind.; CP staff

The ISX 11.9 is set to round out Cummins’ 2010 heavy-duty engine line, with full production commencing next month on the heels of the model’s Environmental Protection Agency and California Air Resources Board certification. A mixer- and dump-suited ISM successor, the ISX11.9 engine and its exhaust treatment components meet EPA January 2010 oxides of nitrogen (NOx) and particulate matter thresholds of 0.2 grams and 0.01 grams per brake-horsepower-hour, respectively.

Like the well-traveled ISX15, the new ISX11.9 (shown here at the 2010 World of Concrete, Las Vegas) uses an enhanced cooled Exhaust Gas Recirculation system, single VGT Turbocharger, and proprietary XPI fuel system. Both engines attain EPA 2010 emissions compliance through the Cummins Aftertreatment System with Selective Catalytic Reduction technology. The ISX11.9 is offered in 310-450 hp and 1150-1650 lb-ft torque ratings, with optional features including single- and dual-cylinder air compressors; Front Engine Power Take-Off; and, an enhanced Rear Engine Power Take-Off for customers who need to maximize payload.

Production ramp up and agency certification follow a validation regimen that saw ISX11.9 test engines accumulate 1.4 million-plus miles and 19,000 hours of operation in nearly 20 unique vehicle installations. Equal to rigorous duty cycles, Cummins engineers contend, the new model features better pulling power and stronger clutch engagement than earlier generation power.