Peterbilt recently added a new CARB-compliant, low-nitrogen oxide (NOx) Paccar MX-13 engine for Models 579, 567, and 589. The engine meets the California Air Resources Board’s Omnibus regulation and features redesigns of internal hardware and the aftertreatment system that reduce NOx emissions, Peterbilt said.
The 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 (SCR), and an improved and more durable NOx sensor design with increased longevity for improved uptime.
These features allow Peterbilt customers to achieve increased engine efficiency and fuel economy while continuing to meet stringent CARB emissions regulation, the manufacturer reported.
“Paccar MX engines were engineered for reliability and fuel economy in a comfortable, quiet, and powerful package,” Scott Newhouse, Peterbilt chief engineer, said in a news release. “The new CARB low NOx Paccar MX-13 engine offers the same great features with a reduced carbon footprint for our customers.”
The CARB low-NOx-compliant MX-13 engine combines the proven diesel powertrain with next-generation technology. 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-horsepower rating with 1,850 lb.-ft. of torque and an efficiency focused rating of 455-horsepower and 1,650 lb.-ft. of torque between 900 and 1,325 RPM.
Peterbilt 579, 567, and 589 trucks with the CARB low-NOx-compliant Paccar MX-13 engine are available for orders now.