Peterbilt Motors says its medium-duty Model 337 and “heavy 7” Model 348 can be ordered with a compressed natural gas (CNG) fuel system using the Cummins Westport ISL-G engine.
The 348 is often equipped with equipment for dump, mixer and other vocational duties, the company said. Both models are now in production and can be configured as trucks or tractors, and ordered with vocational equipment that can be combined with the CNG system.
“Peterbilt is the established market leader in natural-gas powered Class 8 commercial vehicles and we’re pleased to bring this expertise to medium-duty markets,” said Darrin Siver, Peterbilt general manager and a vice president at Paccar, its corporate parent.
Scott Newhouse, Peterbilt’s chief engineer, the new medium-duty models are optimized for this configuration with 110-inch bumper-to-back-of-cab dimensions.
“The CNG Models 337 and 348 give Peterbilt the industry’s most competitive portfolio of natural-gas vehicles,” Newhouse said. “The dimensions provide a BBC 2 inches shorter than any competitive model and a cab height that is 2.5 inches lower.”
Newhouse said the two models’ steering geometry that provides up to a 50-degree turning angle, provides improved maneuverability in congested city and jobsite operations.
The ISL-G is rated at 320 horsepower and 1,000 lb.-ft. of torque. The engine complies with EPA 2010, 2013 and CARB emissions regulations, according to the company.