Navistar has received a lot of coverage on its emissions control strategy for 2010, namely because it’s the only truck maker committed to EGR-only solutions. With the 2010 deadline looming on the horizon, Navistar recently unveiled three MaxxForce diesel engine families ready for submission to the EPA: two medium-duty models and its Big Bore heavy-duty 11- and 13-liter line. Having completed durability and performance testing on all three families, Navistar expects to submit its engines to the EPA in December.
The 2010 Big Bore is available in either 11- or 13-liter variations and features an integrated Jake Brake, twin turbochargers with fixed vanes, a new single ECU, a high-pressure common-rail fuel injection system, and a two-stage EGR cooler. Horsepower is rated from 330 to 475.
The two medium-duty diesel lines prepared for certification are the MaxxForce DT/9/10 inline-six and MaxxForce 7 V-8 families.
The DT inline-six lineup is available in two displacements -- 7.6- and 9.3-liter -- with power ranging from 215 to 330 horses. The 2010 engines feature a 10-percent increase in fuel injection pressure, a new cylinder-head design, and a single EGR cooler.The MaxxForce 7 V-8 sits at the small end of Navistar’s 2010 engine lineup. The 6.4-liter eight-cylinder utilizes higher fuel pressures, twin turbos, a more powerful ECU, and a single EGR cooler. The revisions entitle the MaxxForce 7 to one- to three-percent improvements in fuel economy and power figures from 200 to 300 horses.
Navistar is also currently developing a 2010-compliant heavy-duty 15-liter engine expected sometime in the spring.
Click here to watch a quick video of the MaxxForce7 and MaxxForce Big Bore 13-liter
Source: FleetOwner