Overdrive Magazine | Trucking Business News & Owner Operator Info
Issue link: https://read.dmtmag.com/i/101364
Navistar���s International MaxxForce 13 features four power ratings ranging from 410 to 475 hp. The MaxxForce 15 will be available for a limited time into 2013 with ratings from 435 to 550 hp, but the bulk of the company���s big-bore offerings will be covered by its addition of the Cummins ISX15 this month. drove us in our development of our MaxxForce 13,��� Gilligan says. ���The added weight of emissions-related equipment and fluid is offset by the 13-liter engine.��� Jennifer Rumsey, executive director of heavy-duty engineering for Cummins, says the popular Cummins ISX15 is an integrated driver-friendly engine suited for long-haul. The Cummins ISX12 ��� which shares common components with the ISX15 ��� has been optimized for regional hauling and less-than-truckload operations, as well as vocational applications such as dumps and mixer trucks and fire and emergency vehicles. ���The older thinking was to buy a larger engine and run it easy ��� it���ll get good fuel efficiency and last forever,��� says David McKenna, powertrain sales and marketing manager for Mack Trucks. ���The thinking used to be that if a 5-pound bracket was good, a 10-pound bracket was better. We can now meet customer needs regarding power while improving fuel economy without sacrificing engine life.��� McKenna says today���s most com- Ratings for Cummins��� ISX15 (right) range from 400 to 600 hp with a maximum 2,050 lb.-ft. of peak torque. The Cummins ISX12 (left) is optimized for regional hauling, less-thantruckload and vocational applications. mon horsepower rating for a 13-liter engine is 415, or 32 horsepower per liter. Conversely, 15-liter engines work out to 450 horsepower, or 30 horsepower per liter. ���There is a perception that bigger is better for a long-life engine ��� I strongly disagree,��� he says. ���Our 13-liter Mack MP8 engines have January 2013 | Overdrive | 23