Westport HD engines, featuring Westport HPDI technology, use natural gas as the primary fuel along with a small amount of diesel as an ignition source, or "liquid spark plug". HPDI retains diesel-cycle operation with up to 95% replacement of diesel fuel (by energy) with natural gas.

 

see all torque/power curves »

Maintaining diesel-cycle operation ensures Westport HD engines keep the power and efficiency of their diesel counterparts, with the added benefit of having the same fuel economy as the best diesel engines available today.

Low Emissions + Carbon Credits

Westport Carbon Project

The Westport HD engine sets the benchmark for reducing air contaminants from heavy-duty trucks. The low carbon content of natural gas, burned with the efficiency of Westport HPDI technology, reduces greenhouse gas (GHG) emissions by approximately 21–27% (well-to-wheel) compared to equivalent diesel engines. This means an average reduction of about 30 tons of GHGs for a truck covering 80,000 miles (129,000 km) annually. For a fleet of 100 trucks, that's a GHG reduction of 3,000 tons in one year—the equivalent of taking 340 cars off the road*.

Through the Westport Carbon Project (WCP), Westport HD powered vehicles sold since January 1st, 2010 will be eligible for carbon credits based on an agreed price per ton. Purchasers of an HD-powered vehicle may be eligible for federal and/or state incentives or tax credits.

* Based on US DOE and EPA data of average GHG emissions from 2010 model year compact, mid-size, and SUV class vehicles (www.fueleconomy.gov).

15L Natural Gas Engine

Westport HD 15L Natural Gas Engine

400–475 hp
1,450–1,750 lb-ft torque

EPA & CARB 2010

LNG for Trucking

The Solution for Regional and Long-Haul Trucking

The Westport HD System uses liquefied natural gas (LNG). Storing the natural gas as LNG instead of compressed natural gas (CNG) has many benefits, including:

  • reduces filling times
  • optimizes the truck’s fuel storage envelope, and
  • maximizes vehicle range.
(volumes in US gallons of LNG) 
tank 1tank 2grossnominalDEG*
70 - 70 63 32
100 - 100 90 45
120 - 120 108 55
70 70 140 126 64
70 100 170 153 77
70 120 190 171 87
100 100 200 180 90
100 120 220 198 100
120 120 240 216 110
* diesel equivalent gallons @ 50 psi