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Peterbilt Motors Co. has announced that the Paccar MX-13 Diesel engine, which is California-compliant, is now available for its Model 579 and Model 567 trucks.
The engine is compliant to the California Air Resources Board regulations, which aim at a 90% reduction of nitrogen engine emissions in comparison with current diesel engines. The rule applies to medium- and heavy duty diesel engines from model years 2024 onwards.
Peterbilt, a Paccar-owned company based in Denton, Texas, announced that orders for trucks equipped with CARB-compliant engines were now available.
Paccar said that the changes made to the engine in order to comply with the new regulations included redesigns of the pistons, the crankshaft, and the fuel injectors. A brand-new exhaust system was also added. This larger-volume system — 70% bigger than its predecessor — includes a compact twin assembly with a 48-volt heater in the inlet and a generator located inside the flywheel housing. The internal hardware has been upgraded to include a larger mixer, a longer selective catalytic convert and an improved NOx sensor.
Newhouse
Peterbilt announced that the engines would be built in the Paccar engine factory in Columbus, Miss. A company representative stated that full production will begin in the fourth quarter 2024 after several years of field testing.
The CARB-compliant MX-13 engine will be available in two ratings. A 510-horsepower version with 1,850 pound feet of torque, and an efficiency-focused 455-horsepower version with 1,650 pound feet of torque.
“Paccar MX engine were designed for fuel economy and reliability in a quiet, comfortable and powerful package. The new CARB low-NOx Paccar MX-13 offers the same great features for our customers with a reduced footprint,” said Peterbilt’s Chief Engineer Scott Newhouse.
The introduction of this engine follows the unveiling of the Clean Truck Partnership in July 2023, where CARB and members from the Truck and Engine Manufacturers Association – including Peterbilt’s parent company Paccar – agreed on a timeline for the introduction of equipment that meets California rule. The group includes Daimler Truck North America as well as Hino, Navistar, Volvo Group North America (parent company of Volvo Trucks North America & Mack Trucks), and Cummins.
The Paccar MX-13 Diesel engine is now available for its Model 579 and Model 567 trucks. (Peterbilt)
In the agreement, CARB agreed that it would lower the existing state NOx standards to the federal level and in exchange, Cummins and the truck manufacturers promised to meet the zero-emission vehicle targets and air pollution goals of the state.
The engine option is intended to meet California regulations, but other states will also adopt California’s heavy duty regulations over the next 3 years. Massachusetts and Oregon are expected to adopt the regulations in 2025. New York, Vermont, and Washington will follow in 2026. Four more states are expected to adopt the rules in 2027.
Peterbilt says that while the majority of buyers are likely to come from these states, the engine will also be available for customers in other parts of the U.S.
In February, Kenworth, a sister company of Peterbilt, announced that it was the first truck maker to offer an engine that met the California NOx standard, with the introduction a Cummins X15N for its T680 Sleeper model.
Peterbilt will offer its X15N model on the 579, 567, and 520 refuse trucks. The company expects to begin production of the trucks during the third quarter.
Kenworth will be able to offer its customers a variant of MX-13 diesel engines that are CARB compliant in the fourth quarter.
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