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Kenworth Truck Co. has announced that a California-compliant Paccar MX-13 diesel is now available for their T680, W990 and T880 Class 8 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 rules apply to medium- and heavy duty diesel engines from model years 2024 onwards.
Kenworth, a Paccar-owned brand based in Kirkland (Washington), has announced that orders for trucks equipped with the CARB-compliant engines are now open. Production is expected to begin during the fourth quarter 2024.
“Our customers want better options to navigate the complexity of the changing regulatory landscape. Kenworth models equipped the Paccar MX-13 CARB compliant engine achieve compliance while also delivering an enhanced solution that drives engine efficiency and fuel economy,” said Kevin Haygood.
Kenworth’s CARB compliant MX-13 engine is available in two options. The 510-horsepower MX-13 engine has 1,850 pound feet of torque, and the 455-horsepower MX-13 engine has 1,650 pound feet of torque.
The Golden State required that the engine be modified to comply with its requirements. This included the redesign of the pistons, the crankshaft, and the fuel injectors. A brand-new exhaust system aftertreatment was also added.
Kenworth’s sister company Peterbilt Motors Co. has announced that the California-compliant MX-13 diesel engines are now available for their Model 579, Model 667 and Model 589 trucks.
The introduction of this engine follows the July 20, 2023 unveiling the Clean Truck Partnership . Under the Clean Truck Partnership CARB and the members of the Truck and Engine Manufacturers Association, including Paccar, agreed on timelines for introducing equipment that meets California rules.
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 engine supplier Cummins.
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.