Cummins Westport ISB6.7 G Natural Gas Engine Showcased for School Bus Market

Cummins Westport introduced the 2016 ISB6.7 G, a 6.7L MidRange, factory-built, dedicated natural gas engine, to the Type C School bus market at the North American School Bus Show last week in Reno, Nevada.

The ISB6.7 G natural gas engine is based on the Cummins ISB6.7 diesel engine platform, which is part of Cummin’s MidRange engine family and a top-selling engine in the school bus market. The ISB6.7 G is fueled by CNG or LNG, utilizing Cummins Westport’s proprietary spark-ignited, stoichiometric combustion with cooled Exhaust Gas Recirculation (SEGR) technology. Currently in field trials, the ISB6.7 G will be in full production by mid-2016.

An important feature of the ISB6.7 G is Three-Way Catalyst (TWC) after-treatment, which is packaged as a muffler, and is maintenance-free. No Diesel Particulate Filter (DPF) or Selective Catalytic Reduction (SCR) after-treatment will be required.

Preliminary specifications include a range of ratings up to 260 hp and 660 lb-ft torque, and automatic transmission capability, to meet customer and original equipment manufacturer (OEM) requirements. The ISB6.7 G will be manufactured at the Cummins Rocky Mount Engine Plant in Whitakers, North Carolina. The ISB6.7 G will be certified at launch to meet the U.S. Environmental Protection Agency (EPA) and California Air Resources Board (CARB) emissions standards and fuel-economy regulations.

“We are pleased to display the ISB6.7 G to pupil transportation professionals from across the United States and worldwide here at the STN Expo,” said Rob Neitzke, President of Cummins Westport.