The T680, T880 and T880S medium- and heavy-duty trucks from Kenworth (Kirkland, WA) are now available for order with the Cummins Westport ISL G Near Zero NOx emissions natural gas engine.

The 8.9-liter Cummins Westport ISL G Near Zero is rated at 320 hp and 1,000 lb-ft of torque. Exhaust Image credit: KenworthImage credit: Kenworthemissions of the ISL G NZ are 90 percent lower than the current Environmental Protection Agency (EPA) and California Air Resources Board (CARB) NOx limit of 0.2 g/bhp-hr, and also meet the 2017 EPA greenhouse gas (GHG) emission requirements, according to Cummins Westport.

The new engine uses advanced engine calibration, a unique maintenance-free, three-way catalyst after-treatment system and a closed crankcase ventilation system to help achieve this reduction. The engine operates on 100 percent natural gas, which can be carried on board in either compressed natural gas or liquefied natural gas form. The Cummins Westport ISL G Near Zero engine is also compatible with renewable natural gas, which can provide even further reductions in GHG emissions.