Cummins Westport announced its model-year 2018 lineup of renamed natural gas engines for regional haul, vocational, transit, bus, and refuse applications.

The new lineup comes with a name change. Following Cummins' tradition of using B, L, and X series letters followed by the engine displacement, the new natural gas engines will add an “N” designation.

The new B6.7N, L9N, and ISX12N engines are EPA and California Air Resources Board Low NOx certified and feature onboard diagnostics, closed crankcase ventilation systems, and performance and reliability improvements, according to the company. The new ISX12N also features a redesigned fuel system with fewer parts and improved performance.

Cummins Westport 6.7- to 12.0L engines are designed for truck and bus applications up to 80,000 pounds. 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, says the company.

All CWI engines offer customers the choice of using compressed natural gas, liquefied natural gas, or renewable natural gas as a fuel. Using a low carbon intensity RNG fuel provides better GHG reductions and is part of the company’s zero emissions strategy.

Cummins Westport engines use proprietary spark-ignited, stoichiometric combustion with cooled exhaust gas recirculation technology, and three-way catalyst aftertreatment, which is packaged as a muffler and does not require scheduled maintenance. No diesel particulate filter or selective catalytic reduction aftertreatment is required. 

“Our 2018 product line demonstrates an important milestone in product development for Cummins Westport, creating a move to zero emissions strategy for our customers and industry," said Rob Neitzke, president of Cummins Westport. "We are particularly pleased that the ISX12N will join the L9N in offering our on-highway customers the benefits of performance and reliability at an ultra-low emissions level described by California's South Coast Air Quality Management District as equivalent to an electric vehicle. This move to zero emissions strategy means our customers can choose the most affordable path to zero-equivalent emissions with no commercial constraints on supply or technology readiness."