Cummins Westport Produces ISL G Near Zero Natural Gas Engine

Near Zero (NZ) NOx natural gas engine has commenced. Cummins Westport Inc. (CWI) has announced that orders are being processed and production of the ISL G

The ISL G NZ is the first mid-range engine in North America to receive emission certification from both U.S. Environmental Protection Agency (EPA) and California Air Resources Board (CARB) to meet the optional 0.02 g/bhp-hr. Near Zero NOx emissions standards eight years in advance of the 2023 California Near Zero NOx schedule, said Cummins Westport.

Exhaust emissions of the ISL G NZ are 90% lower than the current EPA and CARB NOx limit of 0.2 g/bhp-hr and also meet the 2017 EPA greenhouse gas (GHG) emission requirements, said the company. CWI natural gas engines have met the 2010 EPA standard for particulate matter (0.01 g/bhp-hr.) since 2001.

The ISL G NZ offers low emission performance and efficiency with engine ratings from 250 to 320 hp and with 660 to 1000 lb-ft torque available.

“The start of production of the ISL G Near Zero natural gas engine offers a game-changing solution for the reduction of urban tailpipe and engine related emissions,” said Rob Neitzke, president, Cummins Westport.  “Combined with the reliability and operating improvements on the base ISL G engine, the ISL G Near Zero is now at the forefront of cost-effective and dependable emission reduction strategies in transit, medium-duty truck and refuse applications.”

The ISL G NZ can operate on compressed, liquid, or renewable natural gas (RNG). Leveraging the technology improvements of the ISL G, the ISL G NZ offers customers improved reliability and durability, said CWI, as well as range and performance with low emissions. It uses a maintenance-free three-way catalyst (TWC) aftertreatment which are passive devices packaged as part of the muffler.  The natural gas engines do not require active aftertreatment such as a diesel particulate filter or selective catalytic reduction.

The ISL G NZ engine is available as a first-fit engine with transit, shuttle and school bus, refuse and truck original equipment manufacturers (OEMs), or as an engine replacement for existing  ISL G vehicles.

It is manufactured at the Cummins engine plant in Rocky Mount, N.C.