Trucks using the Cummins Westport LNG gas powered engines have been released onto the US market by Sterling. This is the the first LNG-engined truck to be built on the assembly line in the US. In the past any LNG engines have been fitted later as a repowering oof the truck.

The Cummins Westport ISL G, an 8.9 litre that already meets US EPA 2010 emissions requirements with three-way exhaust catalyst that requires no maintenance, powers the new Sterling with ratings up to 320 hp. The company says the operating range for a single tank of LNG is over 440 km.

Sterling also used the occasion to show the first Detroit Diesel DD13 engines in their Sterling chassis. The new 12.8 litre engine is closely related to the DD 15 introduced earlier this year, it shares 65% of its components with its big brother but comes out almost 100 kg lighter.

The new engine  is an in-line six cylinder and will be offered in ratings from 350 to 450 hp with peak torque outputs of 1,350 to 1,650 ft lb.