Sterling Trucks Introduces Its First Natural Gas-Powered Vehicle

12 May 2008

Sterling Trucks, a subsidiary of Daimler Trucks North America LLC, has introduced its first natural gas vehicle, the Sterling Set-Back 113, powered by the Cummins Westport (CWI) ISL G engine and using liquefied natural gas (LNG) fuel.

The Cummins Westport ISL G (earlier post), an 8.9 liter stoichiometric cooled-exhaust gas recirculation (EGR) engine, surpasses EPA 2007 phase-in levels and meets 2010 emission standards of 0.2 g/bhp-hr NO_x and 0.01 g/bhp-hr PM. Based on the Cummins ISL, the ISL G leverages Exhaust Gas Recirculation (EGR) with stoichiometric combustion allowing for the use of a three way catalyst, which is maintenance free and is in common use in passenger cars.

In addition to delivering ultra-low emissions, the ISL G, with ratings from 250 to 320 horsepower, will deliver increased thermal efficiency and more than 30% higher low-speed torque compared with today’s CWI Plus engines.