Technology Committee

Cummins Westport introduces Natural Gas Engine Meeting 2010 Emissions in 2007! (or "Why Use NG Engines After 2007?)"

In July 2007 Cummins Westport Inc. received EPA certification for the ISL G stoichiometric natural gas engine.   A stoichiometric engine uses just the right amount of air to completely burn its fuel, compared to older sparked-ignited natural gas engines, which use the “lean burn” (excess air) system, similar to diesel engine operation. The ISL G is the world’s first heavy duty engine for urban bus and truck applications to be certified to the 2010 EPA standard

The ISL G surpasses EPA 2007 phase-in levels and meets 2010 emission standards of 0.2 g/bhp-hr NOx and 0.01 g/bhp-hr PM. Based on the Cummins ISL, the ISL G leverages Cummins’ proven 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 over 30% higher low-speed torque compared with today’s CWI “Plus” engines. Cummins Westport has already logged over 500 orders for the ISL G from U.S. transit properties, including Sacramento Regional Transit and the Orange County Transportation Authority (OCTA). More information about the ISL G can be found at: www.cumminswestport.com/products/islg.php