The ISX12 G natural gas engine is said to be based on the Cummins ISX12 diesel engine platform, the newest member of Cummins heavy-duty engine family. The ISX12 G will operate exclusively on natural gas, and fuel can be carried on the vehicle as either compressed natural gas or liquefied natural gas), utilizing Cummins Westport’s proprietary spark-ignited, Stoichiometric cooled Exhaust Gas Recirculation technology, first introduced with the 8.9-liter ISL G, the company says.
The ISX12 G also features Three-Way Catalyst aftertreatment, which is packaged as a muffler and is maintenance-free. Cummins says no diesel particulate filter or selective catalytic reduction aftertreatment will be required.
“This is an important product development for Cummins Westport, given the increasing demand for natural gas vehicles in the heavy-duty market,” says Jim Arthurs, president of Cummins Westport. “The ISX12 G will offer customers heavy-duty performance, reliability and durability and a choice of either compressed natural gas or liquefied natural gas as a fuel.”
Cummins says the ISX12 G is expected to be certified at launch to meet the U.S. Environmental Protection Agency and California Air Resources Board emissions standards of 0.20-g/bhp-hr oxides of nitrogen and 0.01-g/bhp-hr particulate matter. The engine is additionally expected to be capable of meeting Euro VI and pending U.S. greenhouse gas and fuel economy regulations, the company says.
