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Test drive: Westport HD HPDI NG/diesel

Jason Cannon April 10, 2013

KermitNatural gas truck engines are among the industry’s biggest topics, and Westport is clearly the technology leader in this field.

CCJ Executive Editor Jack Roberts recently took a 2012 Peterbilt 367 daycab tractor, powered by a Westport 15L, 475-horsepower high-pressure direct-injection natural gas engine for a test drive in Vancouver. 

As with the Cummins-Westport family of natural gas engines, the Westport 15L uses a Cummins “donor” engine as its foundation.

While Cummins-Westport engines are spark-ignited, Westport 15L engines rely on a small shot of diesel fuel to initiate combustion. The company says that out of the total fuel capacity on a Westport 15L-powered truck, 95 percent of diesel fuel is replaced by liquefied natural gas – with 5 percent of diesel remaining to initiate combustion.

To read Roberts’ full account of his test drive through the Cascade Mountains, click here.

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