Peterbilt will offer three new liquefied natural gas (LNG) configurations on its Models 387, 386 and 367 in 2009. The factory-installed LNG system, on Cummins ISX engines, is part of a joint agreement between Peterbilt and Westport Innovations. LNG is a clean fuel that’s both domestically available and economical – as long as taxes don’t increase.

Peterbilt trucks were part of Westport’s first road trials, with Norcal Waste in San Francisco back in 2001. The two companies have also collaborated on a project to build Model 386 LNG evaluation trucks for Wal-Mart.

The LNG Models 387, 386 and 367 join Peterbilt’s existing offering of Model 320 CNG vehicles, of which over 50 such trucks are in operation in the U.S.

Westport’s ISX G engine and LNG fuel system for heavy-duty class 8 trucks allow truck operators to move to lower-cost natural gas and/or biogas while offering lower greenhouse gas emissions than comparable diesels. Based on the Cummins ISX with cooled EGR, the LNG version offers the same horsepower, torque, and efficiency as the base diesel. The LNG fuel system comprises fuel tanks, proprietary Westport fuel injectors, cryogenic fuel pumps, and associated electronic components. It’s 2007 EPA and CARB certified to 0.8g/bhp-hr NOx and 0.01g/bhp-hr PM. It’s available with 400- and 450-hp ratings and up to 1750 lb ft torque. LNG fuel tanks can be configured to suit range requirements.