We now have the ratings for the new Paccar-branded 2007 engines that we’ll see in Kenworth and Peterbilt medium-duty trucks next year. Those trucks will be 2008 models, by the way. Until around the new year, the 2006 Kenworth T300 and Pete’s Model 330, 335 and 340 trucks will be available
with Cummins ISB and ISC or Caterpillar C7 engines. In January 2007 the only engine choices will be the new Paccar 6.7L PX-6 and the 8.3L PX-8 engines, which will in fact be ’07 versions of the Cummins ISB and ISC respectively. The Cat C7 will no longer be available.

The PX-6 will be available in six ratings ranging from 200 to 325 hp and 520 to 750 lb ft of torque. It has a 2-year warranty with unlimited miles. The PX-8 engine will be offered in seven ratings from 240 to 330 hp and a torque range of 660 to 1000 lb ft, as well as a 360-hp version for
emergency vehicles. The PX-8 comes with a 2-year, 250,000-mile warranty.

Both these engines are in-line sixes with four valves per cylinder, a high-pressure common-rail fuel system, and a variable-geometry turbocharger. They’re compliant with 2007 EPA regulations, of course.

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