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Cummins Westport Extends Leadership in Natural Gas Engines

Alternative fuel engines – and specifically natural gas engines – continue to generate tremendous interest in the work truck market. The desire for practical, reliable, durable and efficient power from compressed natural gas (CNG), liquefied natural gas (LNG) and renewable natural gas (RNG) fuel sources isn’t confined to non-attainment zones, but is expanding rapidly across North America.

As demand for natural gas continues to grow, so does the fueling infrastructure. The Alternative Fuels Data Center at the U.S. Department of Energy (DOE) currently lists over 1,300 outlets across the United States, including 942 CNG stations and 76 LNG stations. This infrastructure expansion makes natural gas a more viable option than ever before for your customers.

Cummins brings nearly five decades of natural gas technology expertise to the industry, and partnered with Westport Innovations in 2001 to form Cummins Westport, the market leader in natural gas engines in North America. Today, Cummins Westport offers a robust portfolio of natural gas products ranging from the 200 hp ISB6.7 G up to the 400 hp ISX12 G, covering virtually every type of on-highway application from shuttle buses to Class 8 tractor trailers, and is the dominant leader for alternative-fuel engines in every single one of those markets. No one has more natural gas engines in use across North America, no one has more experience and no one has a more competent and qualified service and support network than Cummins Westport.

In the heavy-duty market, the Cummins ISX12 G is making significant inroads among line-haul trucking firms, regional haulers, less-than-load (LTL) trucking customers and heavy-duty vocational and refuse trucks. The driveability of the engine is enhanced with standard engine braking and the flexibility to couple it with manual, automatic or automated manual transmissions. A high power-to-weight ratio plus 1450 lb-ft of peak torque and 700 lb-ft of clutch engagement torque make it an excellent choice for your vocational customers.

For years, the robust ISL G has built on the proven legacy of Cummins ISL9 and L9™ diesel engines in urban transit buses, refuse vehicles and dump trucks. Recent modifications, including a new steel piston, revised piston pin, rings, cooling nozzles, liners and revised material in the cylinder head exhaust valve seat make it more durable and reliable than ever. It helped pioneer advanced Stoichiometric Exhaust Gas Recirculation (SEGR) technology, which is used across all Cummins Westport engines. Plus, the ISL G is available with Front-Engine Power Take-Off (FEPTO) and Rear-Engine Power Take-Off (REPTO) options.

The ISL G Near Zero builds off the proven legacy of the ISL G, but incorporates closed-crankcase ventilation (CCV) and a larger Three-Way Catalyst (TWC), along with new substrate materials and software enhancements. CCV alone accounts for a 70 percent reduction in methane (CH3) emissions, plus an 11 percent drop in carbon dioxide (CO2) emissions. Near-zero certification means that the ISL G NZ operates as cleanly as a battery electric vehicle from well to wheel, at a fraction of the cost. And the ISL G NZ incorporates most of the same reliability improvements from the ISL G, for maximum dependability in a near-zero emissions package. The ISL G Near Zero is the first engine in North America to receive near-zero certification, with a 90 percent reduction in oxides of nitrogen (NOx) emissions below the current U.S. Environmental Protection Agency (EPA) standards for on-highway engines, emitting less than .02 g/php-hr of NOx.

The ISB6.7 G is the most recent addition to Cummins Westport’s product lineup, taking the rugged durability of the B-Series diesel engine and incorporating advanced combustion technology to deliver low emissions in a low-cost, compact solution for Class 4, 5 and 6 vehicles. Ideal for buses, medium-duty trucks and vocational vehicles, the ISB6.7 G has been optimized for use with automatic transmissions. Plus, the ISB6.7 G emits 50 percent lower emissions than required by current standards, operating at 0.1 g/bhp-hr of NOx.

The efficiency of the natural gas combustion process results allows the use of a maintenance-free, TWC aftertreatment on all of Cummins Westport’s engine platforms. That means there is no need for cleanings, regeneration or the use of Diesel Exhaust Fluid (DEF). All Cummins Westport natural gas engines are capable of running on compressed natural gas (CNG), liquefied natural gas (LNG) and renewable natural gas (RNG), whichever fuel best meets your customers’ needs and is readily available in your region.

Engine Model Output
ISX12 G 320-400 hp 239-298 kW
ISL G 250-320 hp 186-239 kW
ISL G Near Zero (ISL G NZ) 250-320 hp 186-239 kW
ISB6.7 G 200-240 hp 149-179 kW

Additional details about these innovative natural gas engines can be found at Customers who want to learn more about natural gas technology can browse a series of informative educational videos that are part of the Cummins Westport Natural Gas Academy.

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