18 May 2010

Paccar announced that the US Environmental Protection Agency (EPA) has certified the Paccar MX 12.9 liter diesel engine to the 2010 emission standards. The certification allows the Paccar MX engine to be installed in Kenworth and Peterbilt vehicles in North America, effective immediately. Over 1,500 Kenworth and Peterbilt vehicles with MX engines have been already ordered, said Paccar.

The Paccar MX engine is available with a power range of 380 to 485 hp and torque up to 1,750 lb-ft. MX engine production in North America will begin this summer at Paccar’s new engine facility in Columbus, Mississippi.

As announced earlier, the MX engine uses urea-based selective catalytic reduction (SCR) in combination with exhaust gas recirculation (EGR) to meet NOx emission requirements and a particulate filter to control PM emissions. The MX engine meets the NOx emission standard of 0.2 g/bhp-hr, said Paccar.

Several other manufacturers, including Daimler and Volvo, also certified their 2010 engines to the 0.2 g NOx standard, while manufacturers who accumulated NOx emission credits are allowed to use them to offset the 2010 NOx requirements. Using credits, Cummins certified their 2010 engines to FEL NOx limits between 0.3 and 0.5 g/bhp-hr, and Navistar to an FEL NOx limit of 0.5 g/bhp-hr.

Source: Paccar