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Kenworth and Peterbilt to add heavy-duty Cummins Westport ISX12 G to line of natural gas engines

Kenworth Truck Company and Peterbilt Motor Company will expanding their alternative fuel line-up by offering the Cummins Westport ISX12 G heavy duty natural gas engine (earlier post) for use in regional haul, vocational and refuse markets. This new engine requires a single fuel source and can run on either compressed (CNG) or liquefied (LNG) natural gas.

The ISX12 G will be available with the Kenworth T660, Kenworth T800, Kenworth T800 short hood, and the Kenworth W900S, as well as the Peterbilt Model 365 and Model 320. The ISX12 G will come with a range of ratings to 400 hp (298 kW) and 1,450 lb-ft (1,966 N·m) of torque, optional engine brake and manual and automatic transmission capability to meet customer needs. Kenworth is showing a T660 equipped with a CNG-powered ISX12 G engine at its booth at the Mid-America Trucking Show in Louisville.

Kenworth continues to work closely with Cummins Westport in the development and testing of this engine to ensure we can offer customers an engine platform that works well with Kenworth chassis. This partnership allows us to provide trucks that offer excellent, low-emission solutions combined with outstanding efficiency, horsepower and torque.

—Michelle Harry, Kenworth natural gas vehicle marketing manager

Kenworth’s line of factory-installed natural gas engines currently includes the 15-liter Westport HD and the 8.9-liter Cummins Westport ISL G. Peterbilt uses the ISL G and Westport GX engine.

The ISX12 G natural gas engine uses a maintenance-free, three-way catalyst and does not require a diesel exhaust fluid (DEF) tank, diesel particulate filter (DPF) or selective catalytic reduction (SCR) technology.

When the ISX12 G is launched next year, Cummins Westport expects it to be certified to meet the US Environmental Protection Agency and California Air Resources Board emission standards of 0.20 g/bhp-hr NOx and 0.01 g/bhp-hr PM. The engine is expected to be capable of meeting EURO VI and pending US greenhouse gas and fuel economy regulations.

The T680 and Model 579. Click to enlarge.

Next-generation Kenworth and Peterbilt trucks. Also at the Mid-America Trucking Show, PACCAR unveiled its new aerodynamic trucks, the Kenworth T680 and the Peterbilt Model 579. The vehicles are the result of a four-year, $400-million program, said Mark Pigott, PACCAR chairman and CEO. The new trucks are equipped with the PACCAR MX-13 diesel engine with a range of 380 to 485 horsepower (283 to 362 kW) and torque up to 1,750 lb-ft (2,373 N·m).

The T680 features an aerodynamic body shape benefiting from a sculpted full-height roof, optimized bumper and hood, full-height side extenders, cab/sleeper-to-fairings closeout panels, chassis fairings extenders, and flush-mounted lighting—all contributing to a 10% enhancement in aerodynamics. The T680 was engineered with 65% more storage capacity, a 50% larger windshield, 40% less interior noise, 30% larger door openings, and best-in-class forward lighting.

The Kenworth T680 is also designed to maximize performance in line haul, pickup and delivery, and regional hauling operations. The Cummins ISX15 engine is an option.

The aerodynamic performance of the Peterbilt 579 is enhanced through modular aero packages that meet the EPA’s SmartWay designation. The aero packages are designed to meet customer-optimized requirements, with variable length chassis fairings, sleeper extenders and rubber flares, under-cab close-outs and under-fairing skirts.

The aerodynamic bumper is a three-piece design so individual sections can be replaced if they are damaged, improving serviceability and reducing costs. The bumper is available with a molded-in-color finish that eliminates cosmetic issues if it is scratched or damaged and a painted finish that is durable and can be matched to any color.

The aero hood also has a three-piece design that is lightweight, durable and easy to service. It features the company’s most efficient tilt assist system that reduces lift effort to 25 pounds. Incorporated into the hood pivot system are supports that direct energy around the cooling module in the event of certain types of accidents—such as impact with an animal—that minimizes damage and helps allow the operator to drive the truck to a safe location for repairs.

The new Kenworth and Peterbilt vehicles expand PACCAR’s product line into the 2.1-meter-wide cab market, with over-the-road sleeper trucks for fleets and lightweight day-cab vehicles. The company currently offers Kenworth T800 and Peterbilt Model 386 in the 1.9-meter cab width market and the long-haul Kenworth T700 and Peterbilt Model 587 in the 2.3-meter cab width tractor market. The new vehicles will build on the 28.1% market share achieved by Kenworth and Peterbilt in the North America Class 8 truck market in 2011.


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