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Cummins Westport Affirms ISB6.7 G Plans

October 4, 2012 in NGVs by Rich Piellisch  |  No Comments

Natural Gas Engine for School Bus, Medium and Vocational Trucks

Cummins Westport said today that it has begun development work on the ISB6.7 G, a mid-range, spark-ignition, 6.7-liter dedicated-natural gas engine for school bus, medium trucks and vocational vehicles.

Cummins Westport has formally affirmed plans to develop a dedicated-natural gas version of the 6.7-liter Cummins ISB6.7 diesel shown here, to be known as the ISB6.7 G, for production in 2015.

The ISB6.7 G will be based on the Cummins ISB6.7 diesel, applying the Cummins Westport joint venture’s spark-ignited, stoichiometric cooled exhaust gas recirculation (SEGR) technology.

As on the successful 8.9-liter ISL G and new 11.9-liter ISX12 G, exhaust aftertreatment will be provided by a simple, maintenance-free three-way catalyst.

The new ISB6.6 G?

2015 Production

The ISB6.7 G is expected to be in production by 2015. It is to meet U.S. EPA and California Air Resources Board regulations in force at that time.

“The addition of the ISB6.7 G will round out our family of high performance natural gas engines,” Cummins Westport president Jim Arthurs said in a release.

“It joins the 8.9-liter ISL G, with over 16,000 engines in service, and the 11.9-liter ISX12 G, which will start production in 2013, to give our customers a broad range of natural gas engines for on-highway applications.”


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