MaxxForce 15 engine for International ProStar+

Engineered specifically for International’s Class 8 heavy-duty on-highway trucks, MaxxForce 15 for the International ProStar+ is available with up to 500 horsepower and 1,850 lb.-ft. of torque and is the most powerful engine Navistar builds (International PayStar heavy-duty vocational trucks are available with MaxxForce 15 up to 550 horsepower).

The MaxxForce 15 is built on a proven block and crankshaft combined with the fuel and air systems of the MaxxForce Advanced EGR system. This combination delivers unprecedented hauling power and unrivaled durability with the convenience of a hassle-free 2010 emissions solution. Peak torque is achieved at 1,000 rpm and holds steady to 1,600 rpm, which reduces gear-shifting needs uphill and allows for shifting at lower speeds when accelerating. Durability is enhanced with a four-bolt connecting rod design.

The four-bolt design assures the clamping force and rigidity required for extreme loads and terrain, for which the MaxxForce 15 is designed. A premium cam and rolling element valvetrain system reduces friction and operational load to maintain peak efficiency across the power band. Interstage cooling between the turbos increases air density to maintain peak power as speeds increase.