The engine emissions are 90 percent lower than the current EPA NOx limit, Peterbilt says, because of a three-way catalyst in the aftertreatment, advanced engine calibration and a closed crankcase ventilation system.
With 320 horsepower and 1,000 lb-ft torque, the engine’s performance and efficiency matches the current ISL-G. The engine runs on 100 percent natural gas and can be either compressed (CNG) or liquefied (LNG). It can also run on renewable natural gas (RNG).
The Cummins ISL-G Near Zero will be available for Models 520 and 320 later this year and for Model 567 trucks in early 2017, Peterbilt says.