Cummins Westport unveiled the ISB6.7 G, a 6.7 litre medium-duty, factory built, natural gas engine for school bus, shuttle bus, medium duty truck and vocational applications.
The new ISB6.7 G is currently in field trials with full production expected to commence in mid-2016, the company said in a statement.
The ISB6.7 G natural gas engine is based on the Cummins ISB6.7 diesel engine platform. The ISB6.7 G will operate exclusively on natural gas (CNG or LNG) utilizing Cummins Westport’s proprietary spark-ignited, stoichiometric combustion with cooled exhaust gas recirculation technology.
Preliminary specifications include a range of ratings of 260 hp and 660 lb-ft torque and automatic transmission capability to meet customer and original equipment manufacturer requirements. The ISB6.7 G will be manufactured in Cummins’ medium-duty engine plant in Rocky Mount, North Carolina.
The ISB6.7 G is expected to be certified at launch to meet the U.S. Environmental Protection Agency and California Air Resources Board emission standards of 0.20 g/bhp-hr NOx and 0.01 g/bhp-hr PM and 2016 U.S. greenhouse gas and fuel economy regulations.
Partial funding in support of the ISB6.7 G engine development has been received from California Energy Commission through its Public Interest Energy Research program in conjunction with the Gas Technology Institute.
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Image: Westport