OEMOffHighway.com |

To meet the U.S. EPA 2010 emissions standards for on-highway diesel engines, Navistar's MaxxForce engines will use advanced fuel injection, air management, electronic controls and proprietary combustion technology.

Navistar unveiled its 2010 MaxxForce 13-liter Advanced EGR engine at the World of Concrete show in Las Vegas. "We are on track to meet 2010 emissions with Maxxforce advanced EGR, and no SCR," says Jim Hebe, Navistar senior vice president, North American sales operations. The Navistar booth displayed a PayStar 5900i SBA with a 475 hp MaxxForce 13 engine that is 2010 compliant.

Navistar's MaxxForce big bore engines are the result of a direct collaboration between the truck and engine groups. Last year, the Navistar reorganized into four business units: North American Truck Operations, Global Truck Operations, Global Bus Operations and Navistar Defense.
Navistar's in-cylinder solution with advanced EGR utilizes four key technologies — advanced high-pressure fuel injection, air management, an optimized combustion strategy and proprietary electronic calibrations — to meet the EPA standards without sacrificing operating costs or performance.

"We've been conducting rigorous testing and analysis in our engine labs and currently have 2010 prototype engines installed in more than 25 medium- and heavy-duty test trucks," says Ramin Younessi, group vice president, truck and engine product development. "These test vehicles are on the road in real-world conditions, in fleets and in the hands of our customers. We will have logged millions of miles of real-world experience before the launch of these engines."

As it is not an SCR system, Navistar's approach will not require the use of diesel exhaust fluid (DEF), or urea.

"We believe the best technolgy is EGR," says Hebe. "Operating costs with advanced EGR will be less, and it will take up less space on the truck. One of the principal reasons we went with EGR is because customers in the vocational truck industry said, ‘don't tie up space on our frame rails.' There is nothing on frame rails with regard to 2010 treatments."

For 2010, suppliers of diesel-powered heavy on-road commercial vehicles — save one — plan to offer North American customers all new, add-on aftertreatment systems using SCR in addition to EGR. Navistar is the exception. It will continue to use an in-cylinder solution utilizing advanced EGR without additional aftertreatment on its MaxxForce-powered International brand vehicles, IC Bus brand school buses and Workhorse brand RV chassis.

"Because we're the only truck and engine maker that can offer a solution without complex after-treatment, we need to be aggressive in giving the industry all the facts," says Jack Allen, president of Navistar's North American Truck Group.

According to Navistar, recent industry surveys show that fleet managers and truckers are not clear on the options for 2010 or the relative merits of competing emissions reduction technologies.