Cummins 2017 B6.7 engine has improved fuel economy.

Cummins 2017 B6.7 engine has improved fuel economy.

Cummins announced improvements to its MidRange engine lineup for 2017 at the Work Truck Show in Indianapolis.

The MidRange lineup features engines ranging from the diesel V5.0, B6.7 and L9 to the Cummins Westport natural gas ISB6.7 G and ISL G Near Zero engines.

"Cummins announced our new MidRange engine platforms last year, but we haven't been resting on our laurels,” said Jeff Caldwell, executive director of North American Truck OEMs for Cummins.


Fuel economy improvements mean the B6.7 engine is seeing an average improvement of 8.5% on efficiency ratings and 5% on performance ratings over Cummins’ EPA-2013 ISB6.7, says Cummins.

For some applications and duty cycles, specifically pickup and delivery, the efficiency ratings have demonstrated up to a 13% fuel economy improvement.

"The program started with a goal of delivering 7% better fuel economy on the efficiency ratings and 1% better fuel economy on the performance ratings over the 2013 product,” Caldwell said. “As the program progressed, we found opportunities to tune and optimize the engine, delivering further efficiency, and allowing us to surpass initial expectations."

Apart from base engine fuel economy enhancements, Cummins also has Stop-Start capability with the B6.7, which will provide additional fuel economy improvement from 3% to 15%. Stop-Start technology allows the engine to operate only when necessary, by shutting off the engine during idle.

The 2017 B6.7 also includes a longer warranty, a complete 3-year/unlimited-mile warranty in truck applications.

Cummins Westport Natural Gas Engines

Cummins Westport ISL G Near Zero engine

Cummins Westport ISL G Near Zero engine

Now in full production for bus, medium-duty truck and vocational applications are the ISB6.7 G and the ISL G Near Zero.

Based on the B Series diesel engine platform, the ISB6.7 G is Cummins Westport’s most compact natural gas offering, according to Rob Neitzke, president of Cummins Westport.

Also available is the ISL G Near Zero, which has emissions certification from both the EPA and the California Air Resources Board to meet the optional 0.02 g/bhp-hr Near Zero oxides of nitrogen (NOx) emissions standards. The NOx emissions of the ISL G Near Zero are 90% lower than the 2010 EPA standard of 0.2 g/bhp-hr.

Both the ISB6.7 G and ISL G Near Zero operate exclusively on compressed natural gas (CNG), liquefied natural gas (LNG) or renewable natural gas (RNG). Both use CWI’s proprietary spark-ignited stoichiometric combustion with cooled exhaust gas recirculation (SEGR) technology.