Cummins Inc. recently announced the start of production on the latest generation of its X15 line of truck engines, in both a high-performance edition and a fuel-efficient version. The engines are being built at Cummins’ Jamestown Engine Plant in Jamestown, N.Y.

The X15 Performance model. Image source: CumminsThe X15 Performance model. Image source: CumminsThe X15 engines are based on the company’s current ISX15 product with the addition of an optimized compression ratio, air handling system, and combustion process to increase both fuel efficiency and performance capability. Cummins says that it estimates that those specs could lead to lower operating costs with up to 20% better fuel economy and 40% lower maintenance costs than its 2010 ISX15 engines.

The X15 Performance engine comes with some hardware changes, including a high-flow EGR cooler and piston cooling nozzles and exhaust valves that are meant to improve reliability. The X15 Performance Series runs on horsepower ranging from 485 to 605, torque ratings from up to 2,050 pound-feet delivered across a wide engine rpm range, and as much as 600 engine braking horsepower at 2,100 rpm. It is aimed at applications including heavy-haul, vocational, and emergency vehicles.

Cummins says the X15 Efficiency Series ranges from 400 to 500 horsepower and 1,450 to 1,850 pound-feet of torque, and 400 braking horsepower at 1,300 rpm. The Efficiency engine is meant more for line-haul and regional-haul applications.

Every X15 also comes ready to connect to a capable telematics system that enables over-the-air engine programming, customization, and diagnostics. Cummins has also added predictive cruise control to its ADEPT suite of connected vehicle technology. With Connected Solutions, drivers and fleet managers can manage their vehicle, make decisions remotely, and even update an engine with the latest calibration without having to bring it to a service bay.

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