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San Diego Metropolitan Transit System Orders 250 Cummins Westport ISL G Natural Gas Engines

The San Diego Metropolitan Transit System (MTS) has ordered 250 Cummins Westport ISL G natural gas engines (earlier post) to be installed in New Flyer, 40-foot, low-floor buses.

The ISL G surpasses EPA 2007 phase-in levels and meets 2010 emission standards of 0.2 g/bhp-hr NOx (nitrogen oxide) and 0.01 g/bhp-hr PM. Based on the Cummins ISL, the ISL G leverages Cummins’ cooled Exhaust Gas Recirculation 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.

The San Diego Metropolitan Transit System (MTS) is a multi-modal transportation agency serving San Diego, California and operates a fleet of more than 600 vehicles carrying more than 88 million passengers per year.



This is good news. The people of San Diego would like cleaner air and an effective mass transit system is what they need.

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