Engine Spotlight

John Baxter | March 01, 2011

Performance has been excellent, he notes. “Many customers have commented on how hard the engine pulls and have also commented on how quiet it is. We launched in June and have continued to increase production of the engine.”

Reported fuel economy, too, has been excellent. John Schmiedeke, co-owner and president of Taylor Transportation, an 18-truck auto hauler in Great Falls, Mont., says his fleet purchased a Kenworth T600 with a Paccar MX engine rated at 485 hp and 1,650 lb.-ft. of torque with a 9-speed transmission.

Schmiedeke drove the truck on a 500-mile trip and was pleased: “It holds speed when climbing hills and pulls real well. The engine sounds quieter than what I’m used to, more like a diesel pickup than an 18-wheeler. It’s one of the nicest trucks I’ve ever bought.”

The company’s other trucks have engines rated up to 600 hp. Because of high wind resistance when hauling cars, they get only 4.8 to 4.9 miles per gallon. However, Schmiedeke says, “The new T600 has gotten up to 5.9 mpg, way up from our other rigs.”


PACCAR MX

CONFIGURATION: Inline 6-cylinder, four valves per cylinder

INJECTION: Single in-block camshaft with electronically controlled unit injector pumps

ENGINE BRAKE: Integral, rated at 465 hp

DISPLACEMENT: 12.9 liters

BORE AND STROKE: 130 mm x 162 mm

GOVERNED SPEED: 2,200 rpm

COMPRESSION RATIO: 16:1

HORSEPOWER: 380-485

TORQUE: 1,450-1,650 (1,550/1,750 multi-torque) lb.-ft.

DRY WEIGHT: 2,640 lb.

OIL PAN CAPACITY: 42 qt.

CHANGE INTERVALS: 40,000 miles for oil, oil filter and primary fuel filter