March 25, 2019 12:15 PM, EDT

Kenworth Offers More Engine Ratings, New Fan Clutch

Kenworth Kenworth T680 (John Sommers II for Transport Topics)

Kenworth Truck Co. announced the addition of two new power ratings for the 12.9-liter Paccar MX-13 engine that is available in the truck maker’s T680, T880 and W990 models.

Kenworth is a brand of Paccar Inc.


Paccar MX-13 (Kenworth Truck Co.)

The first new rating is 405 horsepower and 1,650 pound-feet of torque and is intended for linehaul applications. It enhances integration with the Paccar powertrain, and offers increased fuel efficiency, according to Kirkland, Wash.-based Kenworth.

The second is a multi-torque 455 horsepower rating with 1,650 to 1,850 pound-feet of torque for fuel conscious heavy-haul fleets and truck operators. This rating provides additional torque in the top two gears while pulling a load up a hill, eliminating the need to downshift.

The MX-13 engine now offers ranges of 405 to 510 horsepower and 1,450 to 1,850 pound-feet of torque.

In addition, Kenworth announced a variable speed fan clutch as an option for the 10.8-liter Paccar MX-11 engine for Kenworth’s T680 and T880 models.

The clutch maximizes engine power to the drive axle, helps prevent under- and over-cooling in all climates, and provides faster warm-up and more efficient air conditioning.

The MX-11 engine features ratings of 355 to 430 horsepower and 1,250 to 1,650 pound-feet of torque. Transport Topics