Peterbilt announces CARB-compliant diesel engine

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Updated Jun 5, 2024
CARB low-NOx compliant Paccar MX-13

Peterbilt announced a CARB-compliant diesel engine Tuesday. The new engine will be available in Models 579, 567 and 589. It is available for orders now.  

[RELATED: CARB hit with another suit over Advanced Clean Fleets rule]

"The new CARB low-NOx Paccar MX-13 engine offers the same great features with a reduced carbon footprint for our customers," says Scott Newhouse, Peterbilt chief engineer. Redesigns of the internal hardware and aftertreatment system effectively reduce NOx emissions, Peterbilt says. 

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The engine's larger-volume aftertreatment system includes an innovative compact twin assembly with a 48-volt generator in the flywheel housing and an electrical heater located in the inlet to provide lower NOx output. The internal hardware 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. 

[RELATED: CARB working to align with EPA 2027 regulations]

The low-NOx Paccar MX-13 is available in two ratings with a flat torque curve providing performance across a wider range of RPMs for drivability and fuel economy. It has a 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. 

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"Paccar MX engines were engineered for reliability and fuel economy in a comfortable, quiet and powerful package," Newhouse says. "The new CARB low NOx Paccar MX-13 engine offers the same great features with a reduced carbon footprint for our customers." 

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