|The new ISL G engine.|
Cummins Westport Inc (CWI), a leading provider of high-performance alternative fuel engines for the global market, announced its first commercial order for the new ISL G natural gas engine. Sacramento (California) Regional Transit has ordered 91 ISL G engines to be installed in 40’ Low-Floor Buses in 2007.
The 8.9-liter ISL G (earlier post) will surpass EPA and CARB 2007 phase-in levels and meet 2010 emission standards of 0.2 g/bhp-hr NOx and 0.01 g/bhp-hr PM at launch in 2007. Based on the Cummins ISL, the ISL G leverages Exhaust Gas Recirculation (EGR) and stoichiometric combustion to allow the use of a maintenance-free passive three-way catalyst such as those used in passenger cars since the 1970s.
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 the current models. The ISL G engines offer peak torque ranging from 660-1000 lb ft (895-1356 Nm).
Development of the ISL G—which received almost US$1.3 million in funding support from the US Department of Energy and the California South Coast Air Quality Management District (SCAQMD)—began three and one-half years ago.
The Sacramento Regional Transit District operates 97 bus routes and 36.87 miles of light rail covering a 418 square-mile service area. Buses and light rail run 365 days a year using 76 light rail vehicles, 254 buses powered by compressed natural gas (CNG) and 17 shuttle vans. Sacramento Regional Transit has been operating natural gas vehicles for more than 12 years.
Natural Gas Products for 2007 (California Natural Gas Vehicle Coalition)