With the highest power-to-weight ratio of any engine in the 10-to-16-liter class, the X12 enables trucks to operate at maximum payload with lower fuel consumption. The 12-liter engine is rated up to 475 hp, and provides up to 1700 lb-ft peak torque at 1000 rpm, which remains available to over 1400 rpm, reducing the need for gear shifting and giving better low-speed lugging on grades.

The design of the X12 results in a remarkably low engine weight of just 2,050 lb. enabled by a sculptured block design, allowing unnecessary mass to be removed, and weight savings achieved by the use of high-strength composite materials for the oil pan and valve cover.

Today's ISX12 diesel and natural gas engines continue to benefit from ongoing fuel-efficiency improvements, will be compliant with greenhouse gas and fuel-efficiency standards, and will offer a range of ratings for regional-haul, vocational, and refuse trucks spanning the 350 hp-to-475 hp range.

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