Peterbilt Motors has announced the availability of a Paccar MX-13 engine meeting the California Air Resources Board low nitrogen oxide (NOx) threshold for Models 567, 579, and 589. It aligns with the CARB Omnibus Regulation and features redesigns of internal hardware and the aftertreatment system to effectively reduce NOx emissions. A larger volume aftertreatment system includes an innovative compact twin assembly featuring a 48-volt generator located in the flywheel housing, and an electrical heater located in the inlet to provide lower NOx output. The internal hardware now features a larger volume mixer, longer selective catalytic converter, plus an improved and more durable NOx sensor design with increased longevity for improved uptime.
The CARB low NOx compliant Paccar MX-13 engine combines a proven diesel powertrain with next-generation technology, Peterbilt officials note. It is available in two ratings with a flat torque curve providing performance across a wider range of RPMs for excellent drivability and fuel economy. This includes a high performance 510-hp rating with 1,850 lb.-ft. of torque and an efficiency focused rating of 455-hp and 1,650 lb.-ft. of torque between 900 and 1,325 RPM.
“Paccar MX engines were engineered for reliability and fuel economy in a comfortable, quiet and powerful package. The new CARB low NOx MX-13 offers the same great features with a reduced carbon footprint for our customers,” says Peterbilt Chief Engineer Scott Newhouse. — Peterbilt Motors, Denton, Texas, www.peterbilt.com; www.paccarpowertrain.com
