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Proven Performance Other manufacturers are putting smaller displacement engines in their products. While it is true, with today's electronic controlled engines, the engines can offer more horsepower from a smaller displacement. Higher horse power, from a smaller engine, stresses the mechanical components at higher levels. You can’t expect the same engine life from these smaller displacement engines compared to the larger displacements. Our studies show, if you take two trucks doing the same work in a particular duty cycle, one with a small displacement and one with a larger displacement, the larger displacement truck will last longer with less downtime and lower operating costs. ENGINE Cummins QSL9 250 HP engine (STD) Electronic turbocharger Charge-air after-cooled (air to air) diesel 543 cu-in. (8.9 L) displacement Rated 250 HP @ 2200 rpm Peak torque 675 ft-lbs. @ 1500 rpm For models: X-400M, X-450M, X-520M, X-550M, X-650S, X-650L, X-700L models Cummins QSB6.7 225 HP engine (STD) Electronic turbocharger Charge-air after-cooled (air to air) diesel 408 cu-in. (6.7 L) displacement Rated 225 HP @ 2200 rpm Peak torque 700 ft-lbs. @ 1500 rpm For models: X-450S, X-520S, X-550S, X-550RC models Cummins QSF3.8 110 HP engine (STD) Electronic turbocharger, Charge-air after-cooled (air to air) diesel Rated 110 HP @ 2500 rpm Peak torque 306 ft-lbs. @ 1600 rpm For models: X-160 - X-175 & XH-180 models Cummins QSB6.7 173 HP engine (STD) Electronic turbocharger Charge-air after-cooled (air to air) diesel 408 cu-in. (6.7 L) displacement Rated 173 HP @ 2200 rpm Peak torque 590 ft-lbs. @ 1500 rpm For models: X-180 - X-360L, XB, XH & XHO models

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