The first new rating of 405 hp and 1,650 lb.-ft. of torque provides constant power for line haul applications, enhances integration with the Paccar powertrain and offers increased fuel efficiency, the company says. The second is a multi-torque 455 hp rating with 1,650/1,850 lb.-ft. of torque that is optimized 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.
As a result, the Paccar MX-13 engine now offers ranges of 405 to 510 hp and 1,450 to 1,850 lb.-ft. of torque.
“These new Paccar MX-13 ratings provide enhanced fuel efficiency and lower operating costs for our customers,” says Kurt Swihart, Kenworth marketing director.
In addition, Kenworth now offers a variable speed fan clutch as on option for the 10.8-liter Paccar MX-11 engine for the Kenworth T680 and T880. 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. Kenworth says the Paccar MX-11 engine features superior performance, a powerful and lightweight design and ranges of 355 to 430 hp and 1,250 to 1,650 lb.-ft. of torque.
“The Paccar MX engine series has a B10 design life of 1 million miles in line haul applications. This means 90 percent of Paccar engines will log up to 1 million miles without a major overhaul, almost double the life of a comparable engine,” Swihart says.
