Paccar’s MX diesel engine will be installed in Kenworth and Peterbilt trucks this summer.

Paccar introduced its new MX diesel engine that will be installed in Kenworth and Peterbilt trucks this summer, available with a range of 380 to 485 horsepower and torque outputs up to 1,750 lb-ft. Paccar says this power range – combined with excellent fuel efficiency, high reliability, durability, lightweight design and low cost of ownership – makes it suitable for both over-the-road linehaul and vocational applications. The MX uses selective catalytic reduction in combination with exhaust gas recirculation to meet the Environmental Protection Agency’s 2010 diesel engine emissions regulations.

“We look forward to delivering our integrated and optimized best-in-class drivetrain to our customers,” says Craig Brewster, Paccar assistant vice president.

Paccar designed and manufactured the engine’s block and cylinder head using high-strength compacted graphite iron. According to Brewster, this “premium” material is more durable and lighter than conventional gray iron, resulting in superior power-to-weight performance.

Additional features include an electronically controlled high-pressure fuel injection system designed to deliver excellent fuel economy and a new block design and rear gear train that contribute to lower in-cab noise levels, resulting in a more comfortable driver environment. A new integral engine brake facilitates powerful performance across a broad range of engine RPMs.

Paccar President Jim Cardillo says the MX has accumulated more than 50 million test miles in North America in rigorous, severe conditions. “Over 125,000 Paccar MX engines are successfully operating in DAF trucks globally,” Cardillo notes.

Cummins ready for 2010

EPA certifies heavy-duty, midrange engines

Cummins received certification from the U.S. Environmental Protection Agency that its 2010 heavy-duty big-bore ISX15 and midrange ISB6.7, ISC8.3 and ISL9 engines for on-highway applications meet the near-zero emissions levels required for all engines manufactured in 2010. Cummins uses selective catalytic reduction (SCR) technology to meet EPA’s 2010 standards.

“Receiving the formal certificates is an important step in the process as we enter 2010 with customer-ready products,” says Jim Kelly, president, Engine Business, for Cummins. “This confirms that customers can be confident in the technology choice we’ve made to meet the new, more stringent emissions standards. We expect to see at least 5 percent fuel economy improvement for the ISX15 and up to 3 percent improvement for the midrange products.”

Cummins EPA 2010 engines will include an enhanced cooled exhaust gas recirculation (EGR) system and a single VGT Turbocharger. The ISX15, ISL9 and ISC8.3 feature the Cummins XPI fuel system, and the ISB6.7 features an improved high-pressure common rail (HPCR) fuel system.

The new SCR catalyst is included along with the Cummins particulate filter, first introduced in 2007, in the Cummins aftertreatment system. Incorporating SCR technology also will require the use of diesel exhaust fluid (DEF) at an average rate of 2 percent of diesel fuel consumption. DEF is available at retail locations throughout the United States and Canada, including all Cummins distributor locations.

With the introduction of the new EPA 2010 engines, Cummins says it maintains engine availability across a broad range of on-highway applications. The company’s heavy-duty ISX15 for the heavy-duty Class 8 truck market offers better performance and better reliability compared to today’s ISX. And the midrange ISB6.7, ISC8.3 and ISL9 are designed for and available in a wide variety of applications, including the medium-duty truck, school bus, fire and emergency and recreational vehicle markets.

Addressing the vocational and less-than-truckload markets, the Cummins ISX11.9 will be introduced later in 2010. The ISX11.9 is on target for limited production in mid-2010, with full production commencing in late summer. Cummins says it will submit necessary documentation for EPA 2010 certification for the ISX11.9 later this year prior to introduction to the marketplace.