Westport unveils next-generation High Pressure Direct Injection (HPDI 2.0) natural gas system for HD trucks
Green Car Congress
DECEMBER 10, 2013
Westport anticipates first availability of customer products in late 2014 and 2015. Knock can occur when combustion of the air/fuel mixture in the cylinder starts off correctly in response to ignition by the spark plug, but one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front.
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