With the launch of Kenworth’s new T680 Next Generation truck model, also comes the 2021 Paccar MX-11 and Paccar MX-13 engines. Both engines feature re-designed internal components to enhance fuel economy–up to 2.4 percent in the Paccar MX-13, and 3.4 percent in the Paccar MX-11–depending on the application and specification. The Paccar MX-11 can now be spec’d with a higher horsepower rating of up to 445 horsepower at 1,700 lb.-ft. of torque at 900 RPM. The PACCAR MX-13 can be spec’d up to 510 horsepower at 1,850 lb.-ft. of torque at 1,000 RPM.
The engines also feature optimized combustion with multi-pulse fuel injection. A smaller turbocharger boosts power and improves responsiveness. And an enhanced piston design has added features to reduce frictional losses. Paccar’s next generation aftertreatment system aims to reduce particulates and NOx.
An enhanced engine harness protects against the elements, while connections are reduced between the engine and vehicle. Inside the engine, several structural enhancements were added to strengthen components and optimize rigidity.
Paccar now mounts primary and secondary fuel filters on the engine, instead of on the chassis. A 12-volt fuel heater comes standard for improved cold weather performance.
Extended service intervals of up to 75,000 miles for both the oil and fuel filter combined with major components warranty, which is 5 years or 500,000 miles.
