Peterbilt Offers New ISL G Engine

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Transport Topics  /  August 30, 2016

Peterbilt Motors Co. will soon offer the Cummins Westport ISL G “Near Zero” engine as an option on three of its vocational trucks, the Denton, Texas-based manufacturer said August 30.

Peterbilt is offering the ISL G Near Zero in its Model 567, a vocational truck, and Models 520 and 320, both low-cab-forward refuse haulers.

Near Zero refers to emissions of nitrogen oxide compounds, or NOx, at a level of 0.02 gram per brake horsepower-hour — 90% lower than the current federal standard of 0.2 gram.

The 8.9-liter ISL G uses natural gas, either compressed or liquefied, as truck fuel and is manufactured by a joint venture owned by Cummins Inc. and Westport Innovations.

Peterbilt said the engine produces 320 horsepower and 1,000 pound-feet of torque.

Near Zero is the latest version of the ISL G, which has been in production since June 2007.

Peterbilt will start making Models 520 and 320 with the new engine before Dec. 31. Production for Model 567 with Near Zero will follow early next year.

The ultra-low NOx engine is particularly important in California, where the state government has a program to limit NOx emissions as well as those of carbon dioxide and other greenhouse gases.

“Peterbilt is producing increasingly efficient products. The addition of the ISL G Near Zero emissions engine strengthens Peterbilt as an environmental leader,” said Scott Newhouse, Peterbilt’s chief engineer.

Related reading - http://www.cumminswestport.com/models/isl-g-near-zero

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Peterbilt Offers Cummins Westport Near-Zero Natural Gas Engine

Heavy Duty Trucking  /  August 30, 2016

Peterbilt Motors is offering the Cummins Westport ISL G “Near Zero” NOx emissions natural gas engine for its Model 567, 520 and 320 trucks.

The new engine’s performance and efficiency matches the current ISL G with 320 horsepower and 1,000 lb.-ft. of torque available. The engine option is aimed at customers with linehaul, vocational and refuse applications.

The ISL G Near Zero engine’s emissions are 90% lower than the current EPA NOx limit, made possible with a three-way catalyst in the aftertreatment, advanced engine calibration and a closed crankcase ventilation system.

Like the current ISL G engine, the new model will operate on 100% natural gas, which can be carried on the vehicle in either compressed or liquefied form. The ISL-G Near Zero can also run on renewable natural gas.

The ISL G NZ is the first mid-range engine to meet the 0.02 g/bhp-hr optional Near Zero NOx Emissions standards for medium-duty truck, urban bus, school bus, and refuse applications, according to Cummins Westport. It meets California Air Resources Board certification eight years in advance of the 2023 California Near Zero NOx schedule.

The engine will be available for production in Models 520 and 320 by year's end and in the Model 567 early next year.