Kenworth is enhancing its engine line-up for 2013 with the addition of the next generation of Paccar proprietary engines. Kenworth customers can now specify the new Paccar MX-13, Paccar PX-9 and Paccar PX-7 engines on new Kenworth truck orders

placed through Kenworth dealers in the United States and Canada for delivery in 2013.

The Paccar MX-13, Paccar PX-9 and Paccar PX-7 replace the Paccar MX, Paccar PX-8 and Paccar PX-6, respectively. The new engines are undergoing extensive testing and dealer service technicians will receive engine training.

Paccar MX-13

The 12.9-liter Paccar MX-13 engine is designed to meet the demands of heavy-duty truck applications. The engine is available for Kenworth Class 8 models, including the Kenworth T660, T680, T700, T800 and W900.

"The new Paccar MX-13 engine offers a wide range of horsepower and torque ratings to meet customer power requirements," said Judy McTigue, Kenworth director of marketing planning and research. "This engine opens the Kenworth door to additional customers in vocational applications, including logging, dumps and hauling applications over 100,000 pounds."

The engine's horsepower and torque begin at 380 horsepower and 1,450 pounds-feet, respectively.

The Paccar MX-13 uses the latest common rail, fuel-delivery technology, which enables injection pressures of up to 2,500 bar and significantly enhances fuel efficiency and performance.

The common rail fuel system uses controls to regulate the fuel in a central manifold, only compressing the amount of fuel mixture needed. The result is finer fuel atomization and more ways to optimize combustion, ensuring the lowest possible fuel consumption, emission and noise levels.

Paccar PX-9

The 8.9-liter Paccar PX-9 engine is available for Kenworth medium- and heavy-duty trucks, including the Kenworth T270, T370, T440, T470 and W900S. The PX-9 possesses one of the highest power-to-weight ratios in its class, according to Paccar, with heavy-duty features such as replaceable wet liners, roller cam followers, bypass oil filtration and targeted piston-cooling.

The Paccar PX-9 offers ratings from 260 to 380 horsepower and provides up to 1,250 pounds-feet of torque. The engine delivers the durability and efficiency necessary to help lower operating expenses, reduce maintenance and increase productivity.

Paccar PX-7

The 6.7-liter Paccar PX-7 engine is available for Kenworth's medium-duty conventional and cabover line-up. The engine offers ratings of 200 to 325 horsepower and up to 750 pounds-feet of torque for the Kenworth T170, T270 and T370. For the Kenworth K270 and K370 cabovers, Paccar PX-7 ratings are 220-horsepower/520 pounds-feet, 240-horsepower/560 pounds-feet and 250-horsepower/660 pounds-feet.