Test drive: Westport HD HPDI NG/diesel
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.