ARB Research Seminar

This page updated June 19, 2013

Development, Demonstration, and Commercialization of a 0.20 G/BHP-HR NOx Natural Gas Engine

Scott Baker, P.E., Cummins Westport Inc., Vancouver, BC, Canada

August 25, 2010
Cal EPA Headquarters, 1001 "I" Street, Sacramento, CA

Research Project


Cummins Westport commenced commercial production of the 8.9 liter ISL G natural gas engine in June, 2007, with ARB certification to the 2010 on-highway emission standard. The ISL G engine uses stoichiometric, cooled EGR, spark ignition (SESI) combustion technology in conjunction with a three way exhaust catalyst, a passive device which is highly effective at passive NOx conversion. The ISL G target markets at launch were transit buses and refuse collection trucks. Following ISL G launch, CWI and ARB executed ICAT Grant Agreement 06-08 to further develop & demonstrate the ISL G engine in medium duty truck applications, leading to factory availability from a major medium duty truck OEM. The scope of work included developing additional performance rating & hardware options to enable the ISL G engine to be installed in medium duty trucks, as well as enabling installation in a wide range of other commercial vehicle applications, including yard tractors, street sweepers, school buses, and shuttle buses. The project deliverable would be a version of the ISL G that is commercially available for use in medium duty trucks and the specialty vehicle applications identified above.

Cummins Westport has developed two additional ratings for the ISL G, and a new "low-mount" turbocharger option to enable ISL G integration in Freightliner's popular M2 truck model. These new options became commercially available in early 2009, and are in widespread commercial use by fleet customers. Pacific Gas & Electric has operated an ISL G-powered truck in its fleet operations for approximately 12 months. Freightliner has commercialized multiple ISL G-powered versions of its M2 truck. The OEM availability of ISL G-powered vehicles has expanded significantly during this ICAT project, and includes major vehicle manufacturers in each of the target market segments identified above.

Speaker Biography

Scott Baker, P.E., is Director, Product & Market Planning for Cummins Westport Inc. Mr. Baker has been with Cummins Westport since its inception in 2001. Prior to the formation of Cummins Westport, Mr. Baker was with Westport Innovations beginning in 1998. He has held positions in Application Engineering and Product Planning prior to assuming his current role in 2009. Mr. Baker has a B.A.Sc. in Mechanical Engineering from the University of British Columbia.

Cummins Westport Inc. (CWI), a joint venture company formed between Cummins Inc. and Westport Innovations Inc., is responsible for developing and commercializing advanced, low-emission, alternate fuel engines. CWI develops and markets a range of high-performance low-emission engines for commercial vehicles, based on Cummins 5.9 liter through 8.9 liter engine platforms.

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