Cummins Westport ISX12 G

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The Cummins Wesport ISX12 G is an 11.9-litre, six-cylinder inline natural gas engine for motorcoach, regional haul truck/tractor, vocational and refuse applications. It was launched in 2012 and went into production in early 2013.[1] The ISX12 G is based off of the diesel-fueled Cummins ISX12.

The ISX12 G may be fueled by compressed or liquefied natural gas, as well as renewable natural gas—derived from biogas or landfill gas. The engine features spark-ignited, stoichiometric combustion with cooled exhaust gas re-circulation. Like the Cummins Westport ISL G, the ISX12 G uses a three-way catalyst which works by introducing a catalyst to convert the nitrogen oxides to nitrogen gas and oxygen gas, carbon monoxide to carbon dioxide, and hydrocarbons to carbon dioxide and water.[2]

The ISX12 G meets the Environmental Protection Agency (EPA) and California Air Resource Board (ARB) 2013 emissions standards, as well as the 2014 EPA greenhouse gas regulations.[1][3]


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Current products
Diesel B4.5 / B6.7 - L9 - X12 / X15
CNG B6.7N - ISB6.7 G - ISX12 G - ISX12N - L9N
Former products
Diesel ISB6.7 - ISL9 - ISX12 / ISX15 B5.9 - C8.3 - ISC - ISM - L10 - M11 - NH Series - VTB-903
CNG B5.9G - B Gas Plus - C8.3G - L10G - C Gas Plus - L Gas Plus - ISL G
Propane B LPG Plus