Cummins Westport debuts re-tooled natural gas engine lineup

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Updated May 2, 2017

Cummins Westport announced Monday at the Alternative Clean Transportation (ACT) Expo in Long Beach, Calif., its model year 2018 dedicated natural gas engines for regional haul trucks, vocational and transit, school bus and refuse applications.

The new lineup – featuring the B6.7N, L9N and ISX12N engines – comes with a change in names, following Cummins tradition of using B, L, and X series letters, followed by engine displacement. The letter “N” denotes engines that are fueled by natural gas.

Cummins Westport President Rob Neitzke says the 2018 product line demonstrates an important milestone in product development for Cummins Westport and creates a move to zero emissions strategy for the industry.

The new ISX12N features a redesigned fuel system with fewer parts and improved performance.

Like the L9N that replaces the ISL G Near Zero, the 2018 ISX12N heavy-duty natural gas engine for regional haulers, vocational, and refuse applications will also be certified to EPA and CARB optional low NOx Emissions standards of 0.02 g/bhp-hr.

The ISX12N and L9N will be the lowest certified NOx emission engines available in North America.  NOx exhaust emissions are 90 percent lower than the current EPA NOx limit of 0.2 g/bhp-hr, and the engines also meet or exceed the 2017 EPA greenhouse gas (GHG) emission requirements. Cummins Westport natural gas engines have met the 2010 EPA standard for particulate matter (0.01 g/bhp-hr) since 2001.

All Cummins Westport engines offer a choice of using compressed natural gas (CNG), liquefied natural gas (LNG) or renewable natural gas (RNG) as a fuel.  Using low carbon intensity RNG fuel provides significant well-to-wheel GHG reductions and is an important aspect of a move to zero emissions strategy.  According to CARB’s Low Carbon Fuel Standard studies, RNG can reach subzero GHG carbon intensity levels.

Cummins Westport engines utilize proprietary spark-ignited, stoichiometric combustion with cooled exhaust gas recirculation technology, and three-way catalyst aftertreatment, which is packaged as a muffler and is maintenance-free.  No diesel particulate filter or selective catalytic reduction aftertreatment is required.

CWI 6.7- to 12-liter engines are designed for truck and bus applications up to 80,000 pounds.  Available from leading truck and bus OEMs, vehicles can be tailored to perform to meet customer requirements with enough range to offer route flexibility without  in-route refueling. For example, on highway natural gas trucks can have over 700 mile range capability.

The ISX12N will be manufactured in Cummins’ heavy-duty engine plant in Jamestown, New York. The L9N and the B6.7N are manufactured in Cummins midrange engine plant in Rocky Mount, North Carolina.

Partial funding in support of the ISX12N engine development has been received from South Coast Air Quality Management District, the California Energy Commission, Southern California Gas and Clean Energy.