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Cummins announces next-gen X15 diesel

Cummins announced it will launch its most efficient heavy-duty diesel engine ever. As the next product in the Cummins HELM 15-liter fuel agnostic platform, the diesel X15 will be compliant with US EPA and CARB 2027 aligned regulations at launch. The next generation X15 diesel engine in North America will serve the heavy-duty on-highway market.


Maintaining the traditional reliability and lower operating costs that have met the needs of a diverse customer base since the inaugural X15 launch in 1998, the next-generation, advanced diesel X15 will feature improved greenhouse gas and fuel efficiency benefits while retaining the same ratings of the current X15 (up to 605 horsepower and 2,050 ft-lb of torque) and optimizing powertrain integration with Eaton Cummins and Cummins-Meritor.

This next-generation engine is designed to have the capability to meet future emissions regulations beyond 2027 without the need for significant architecture changes. This investment will help the company maintain technology leadership for the next decade as it continues to fund future research and development in hydrogen and alternative fuel engines, battery electric and fuel cell powertrains.

From its inception, the next generation X15 was developed with Cummins’ fully integrated powertrain in mind. The X15 architecture utilizes a belt-driven, high output 48-volt alternator and aftertreatment heater solution, optimized for increasingly stringent emission standards.

Customers taking advantage of EX ratings (requires Eaton Cummins Endurant and GPS look-ahead data) with Cummins Meritor axles, brakes and drivelines will experience additional optimized fuel efficiency and drivability through features such as predictive gear shifting, on-ramp boost, and hill roll out.


The engine is built on Cummins’ HELM fuel agnostic 15-liter engine platform. These new fuel agnostic engine platforms feature a series of engine versions that are derived from a common base engine, which means they have some parts commonality. Below the head gasket of each engine will largely have similar components and above the head gasket will have different components for different fuel types.

Each engine version will operate using a different, single fuel. The X15N, the natural gas variant, is the first engine on the Cummins HELM platforms available to customers. The Cummins HELM platforms include the B, X10, and X15 engine platforms.

Aligned with Cummins diesel engine portfolio, the new X15 is capable of using biodiesel blends up to 20% and renewable diesel blends up to 100%. Cummins was an early adopter of renewable fuels and continues to advance use of higher biodiesel blends and renewable diesel. These low carbon diesel fuels have been proven to reduce carbon intensity of diesel fuel consumption and are readily available in today’s fueling infrastructure.

The new X15 is equipped with Acumen, which provides digital connectivity and direct, immediate access to a range of applications and capabilities. These capabilities provide value throughout the lifecycle of the engine and include over-the-air calibration, predictive service recommendations and additional features that help fleets keep their trucks and equipment on the road.

The new X15 will be produced in Jamestown, New York.


Roger Pham

Hydrogen and biomethane as main fuel with diesel fuel pilot injection should be the future direction for these engines, because these ultra-lean pre-mixed combustion of hydrogen and biomethane would help address increasingly stringent emission regulation while reducing the cost of emission control equipment. When the pilot injection of trace quantity of diesel fuel is injection early enough, the fuel will vaporize completely and will result in negligible soot and NOx. The ultra-lean burn of the hydrogen and biomethane with some degree of exhaust gas recirculation that follows that pilot injection will likewise burn with nearly zero NOx and zero soot.

There will be no need for a Diesel Particulate Filter, while very little Diesel Exhaust Fluid will be needed due to very low NOx potential from these engines.
From these advantages, even if the owner decides to remove the emission control system, the emission damage to the environment would still be minimal, although there would be no need to do so because the impact of this minimal emission control on engine performance will be negligible.


Not even a zero maintenance hybrid Prius like transmission?

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