ISB6.7G to use the spark-ignited, stoichiometric-cooled exhaust gas recirculation technology.
VANCOUVER—Cummins Westport Inc. says it has begun development on the ISB6.7 G, a mid-range 6.7 liter natural gas engine to meet increasing demand for lower-cost natural gas highway vehicles.
The engine, expected to be in production by 2015, will be based on the Cummins ISB6.7 diesel engine and will use Cummins Westport’s spark-ignited, stoichiometric cooled exhaust gas recirculation (SEGR) technology. Exhaust aftertreatment is provided by a maintenance-free three-way catalyst. The engine will run on compressed natural gas (CNG), however, the natural gas may be stored on the vehicle in liquefied natural gas (LNG) state or as CNG.
Cummins Westport says the engine will meet Environmental Protection Agency (EPA) and California Air Resources Board (CARB) regulations.
Cummins Westport Inc. engineers spark-ignited natural gas engines for North American trucks and buses. It is a joint venture between Cummins Inc., an engine manufacturer and distributor, and Vancouver’s Westport Innovations, a developer of alternative fuel and low emissions transportation technologies.