Cummins Westport Produces ISL G Near Zero Natural Gas Engine

By pdamon17 September 2016

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.

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