Cummins Westport to offer 6.7L Natural Gas Engine in 2016

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Heavy Duty Trucking / May 5, 2015

Cummins Westport will begin producing the ISB6.7 G, a 6.7-liter dedicated natural gas engine for medium-duty trucks, shuttle buses, and vocational vehicles by the middle of 2016.

The ISB6.7 G is based on the Cummins ISB6.7 diesel engine platform and will operate exclusively on natural gas – either compressed natural gas or liquefied natural gas. The engine is currently in field trials and will have a range of ratings of up to 260 hp and 660 lb.-ft. of torque and automatic transmission capability that can be specified to customer and OEM requirements.

The engine uses Cummins Westport’s proprietary spark-ignited, stoichiometric combustion with cooled exhaust gas recirculation technology. The SEGR technology was first used on the 8.9-liter ISL G engine.

The ISB6.7 G features three-way catalyst aftertreatment that's packaged as a muffler and requires no maintenance, according to Cummins Westport. No diesel particulate filter or selective catalytic reduction aftertreatment will be required.

The engine is expected to be certified at launch to meet the U.S. Environmental Protection Agency and California Air Resources Board emission standards and 2016 U.S greenhouse gas and fuel economy regulations. The ISB6.7 G will be manufactured in Cummins' medium-duty engine plant in Rocky Mount, N.C.

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Cummins Westport introducing new ISB6.7 G mid-range natural gas engine

Green Car Congress / May 6, 2015

At the opening reception at ACT Expo in Dallas, TX, Cummins Westport Inc. will unveil the ISB6.7 G, a 6.7-liter medium-duty, factory-built dedicated 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 ISB6.7 G natural gas engine is based on the Cummins ISB6.7 diesel engine platform, the industry leader in the Cummins medium-duty engine family. 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 (SEGR) technology, first introduced with the 8.9-liter ISL G.

The SEGR technology was introduced with the ISL G in 2007, and was developed to meet 2010 EPA emission requirements. The cooled-EGR system passes exhaust gas through a cooler to reduce temperatures before mixing it with fuel and the incoming air charge to the cylinder. Stoichiometric combustion in combination with cooled-EGR offers increased power density and thermal efficiency. It also reduces in-cylinder combustion temperatures and creates an oxygen-free exhaust, which then enables the use of a three-way catalyst (TWC) for NO_x control.

The ISB6.7 G TWC is packaged as a muffler and is maintenance-free. No diesel particulate filter or selective catalytic reduction aftertreatment will be required. The 6-cylinder ISB6.7 G will offer up to 260 hp (194 kW) and 660 lb-ft (895 N·m) of torque, and will be available with both manual and automatic transmissions.

The ISB6.7 G shares many base engine components with the ISB6.7 diesel engine and shares the emissions architecture of the ISL G and ISX12 G, including wastegate turbocharger, a high-energy ignition system controlled by the CM2180A Engine Control Module, and similar fuel module design.

The ISB6.7 G is expected to be certified at launch to meet the US Environmental Protection Agency and California Air Resources Board emission standards of 0.20 g/bhp-hr NO_x and 0.01 g/bhp-hr PM and 2016 US 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 (PIER) Program in conjunction with the Gas Technology Institute.

The ISB6.7 G will be manufactured in Cummins’ medium-duty engine plant in Rocky Mount, North Carolina.