The Westport GX 2010 15L engine has been certified by the US Environmental Protection Agency (EPA) to 2010 emissions compliance—0.2 g/bhp-hr oxides of nitrogen (NOx) and 0.01 g/bhp-hr particulate matter (PM)—without the use of emissions credits.

Adding to the US certification, Australia’s Department of Infrastructure, Transport, Regional Development and Local Government has certified the Westport GX engine in compliance with the Australian Design Rules (ADR) 80/03, which takes effect for all heavy-duty truck models starting January 2011.

The Westport HD System offers class-leading performance for heavy-duty on-road Class 8 trucks and allows trucking fleets to move to lower-cost, domestically available and low-carbon natural gas and/or biogas. The Westport HD System features the Westport GX 15L engine—based on the Cummins ISX diesel engine with cooled exhaust gas recirculation—and Westport’s liquefied natural gas (LNG) fuel system (LNG fuel tanks, proprietary Westport fuel injectors, cryogenic fuel pumps).

The Westport GX is available in power ratings of 400-475hp (298-354 kW) and torque ratings of 1450-1750 lb-ft (1966-2373 N&iddot;m). Factory installation of the GX is available in both Kenworth and Peterbilt tractors.