Peterbilt announces CARB-compliant MX-13 diesel engine

5 June 2024

Peterbilt announced the availability of a new “CARB low NOx compliant” Paccar MX-13 engine in the Model 579, 567 and 589 trucks. This engine meets the CARB Omnibus Regulation, the company said, and features redesigns of internal hardware and the aftertreatment system to effectively reduce NOx emissions.

The CARB 2024 NOx emission standard is 0.050 g/bhp-hr (FTP) but the 2024 MX-13 engines listed by CARB are certified to a NOx level of 0.12 g/bhp-hr and have a family emission limit (FEL) for NOx of 0.20 g/bhp-hr, suggesting that Paccar intends to use emission credits to comply with the CARB Omnibus Regulation.

The larger volume aftertreatment system includes a 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 SCR converter and an improved and more durable NOx sensor design with increased longevity.

The CARB low NOx compliant Paccar MX-13 engine is available in two ratings with a flat torque curve providing performance across a wider range of engine speed. 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.

Peterbilt Models 579, 567 and 589 with the CARB low NOx compliant Paccar MX-13 engine are available for orders now.

Source: Peterbilt