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Cummins introduces new heavy-duty natural gas powertrain

9 March 2021

Cummins Inc. and Cummins Westport Inc. announced that the ISX12N+Endurant HD N powertrain from its Integrated Power portfolio is now available for heavy-duty customers, delivering a fully integrated natural gas powertrain. The combination of the ISX12N natural gas engine and the Endurant HD N 12-speed automated transmission from Eaton Cummins Automated Transmission Technologies is intended for heavy-duty regional haul fleets.

“The ultra-low emissions of the ISX12N combined with the Endurant HD N transmission provides the optimal powertrain solution for customers working to lower their carbon footprint,” said Thomas R. Hodek, President of Cummins Westport. “The deep powertrain integration delivers improved launch, low speed maneuverability, and smoother shifts that drivers will appreciate.”

Cummins ISX12N+Endurant HD natural gas powertrain

The ISX12N is an inline, 6-cylinder, spark-ignited engine with a bore and stroke of 130×150 mm and a displacement of 11.9 L. When paired with the Endurant HD N automated transmission, the ISX12N natural gas engine is available with a rating of 400 hp and 1,450 lb-ft torque and can operate with compressed natural gas (CNG), liquefied natural gas (LNG) or renewable natural gas (RNG). The engine has been certified to the California Air Resources Board (CARB) voluntary NOx emission limit of 0.02 g/bhp-hr—90% lower than the current Environmental Protection Agency (EPA) NOx standard of 0.2 g/bhp-hr. When operated using RNG, the powertrain is credited with a neutral to negative carbon index, resulting in GHG emissions at or below zero.

The new Endurant HD N automated transmission was optimized for integration with the ISX12N natural gas engine and features new software functionality and calibrations, and a new diaphragm spring clutch designed to meet the load requirements of the natural gas engine while protecting the engine for optimal performance.

The integration between the engine and transmission results in improved launch performance, improved low-speed maneuverability and smoother shifts when compared to previous natural gas engines and automated manual transmission combinations, according to Cummins.

Source: Cummins