Kenworth is adding the Cummins Westport L9N near zero NOx emissions natural gas engine as an option for its T680, T880 and T880S trucks.

The L9N engine is certified to the California Air Resources Board (CARB) optional low NOx standard of 0.02 g/bhp-hr ‒ a 90 percent reduction from engines operating at the current Environmental Protection Agency (EPA) NOx limit of 0.2 g/bhp-hr. In addition to ultra-low emissions, the L9N features on-board diagnostic capability, a maintenance-free three-way catalyst, closed crankcase ventilation system, and an engine control module with excellent durability.

The T680, T880 and T880S offer the 8.9-liter L9N rated at 320


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