Cummins Westport ISL G In-Use Test Results Beat 2010 Emissions Regulations

4 May 2009

A Cummins Westport ISL G in-use emissions test performed on an urban transit bus recorded emissions significantly lower than the 2010 EPA and California Air Resources Board (CARB) Heavy Duty emission regulations.

The test was conducted on a 2008 40 foot Orion VII Low Floor natural gas bus powered by an ISL G 280, driven by a Sacramento Regional Transit bus driver on city and highway routes. The US EPA in-use testing procedures were designed such that the heavy-duty engine emissions are controlled over the full range of speed and load combinations commonly experienced in vehicle applications.

Sensors Inc. concluded that emissions were significantly lower than the 2010 EPA Heavy Duty in use emission requirements.

The Cummins Westport (CWI) 8.9 liter ISL G natural gas engine features new combustion technology (Stoichiometric Cooled EGR) that enabled the ISL G to be the first heavy duty engine to meet the 2010 EPA emissions regulations. (Earlier post.)