ACT Expo 2018


ISX12 G Gets Heavy Exposure at MATS

March 21, 2012 in NGVs by rich  |  No Comments

Cummins Announces Its Own 15-Liter Spark Engine

The 11.9-liter engine that’s been an open secret as the key to increased penetration of natural gas in over-the-road trucking is getting heavy exposure at the Mid America Truck Show in Louisville, just one month after the spark-ignition powerplant was formally announced as the ISX12 G by Cummins Westport, Inc.

Separately, Cummins announced plans for a 15-liter spark engine, the ISX15 G. The dedicated natural gas engine is being developed outside of the CWI joint venture.

ACT Expo 2011 in Long Beach, Calif. included one of the first public showings of the new 11.9-liter spark ignition engine from Cummins Westport. It was displayed as a proof-of-concept engine in a Freightliner Cascadia tractor.

ACT Expo 2011 in Long Beach, Calif. included one of the first public showings of the new 11.9-liter spark ignition engine from Cummins Westport. It was displayed as a proof-of-concept engine in a Freightliner Cascadia tractor.

Like CWI’s 8.9-liter ISL G (of which 10,000 have been manufactured), the 11.9-liter ISX12 G can power trucks solely on natural gas — using either CNG or LNG fuel. It will employ three-way catalyst aftertreatment, packaged as a muffler and maintenance free. No diesel particulate filter or selective catalytic reduction aftertreatment will be required.

The engine features Cummins Westport’s proprietary stoichiometric combustion with cooled exhaust gas recirculation (SEGR) — first introduced on the ISL G.

Paccar’s Kenworth unit has been quick to jump on the ISX12 G bandwagon, showing a CNG-powered T660 with the engine at MATS. The ISX12 G will also be available on T800, T800 short hood, and Kenworth W900S models, with a range of ratings to 400 horsepower and 1,450 ft-lbs of torque, optional engine brake, and manual and automatic transmissions.

Early 2013 Production Target for ISX12 G

Kenworth circulated this photo of the Cummins Westport ISX12 G as it announced availability of the dedicated-natural gas, spark-ignition engine in several of its heavy duty truck models at MATS in Louisville

Kenworth circulated this photo of the Cummins Westport ISX12 G as it announced availability of the dedicated-natural gas, spark-ignition engine in several of its heavy duty truck models at MATS in Louisville

Field testing meanwhile continues, CWI says, with production expected to begin in early 2013. The ISX12 G will be manufactured in Cummins’ heavy-duty engine plant in Jamestown, New York, and will be backed by a Cummins Base Warranty (2 years, 250,000 miles, 6,250 hours of operation). Extended coverage options will be released closer to production. Service, parts and training support will be delivered by the Cummins Service network.

“This is an important product development for Cummins Westport given the increasing demand for natural gas vehicles in the heavy-duty market,” new CWI president Jim Arthurs said in a release. “The ISX12 G will offer customers heavy-duty performance, reliability, and durability, and a choice of either compressed natural gas or liquefied natural gas as a fuel.”

Green Bay, Wisc.-based Paper Transport, Inc. is testing the new spark-ignition, 11.9-liter dedicated natural gas engine from Cummins Westport, Inc. in this Kenworth T660 tractor, as well as in a Freightliner Cascadia.

Green Bay, Wisc.-based Paper Transport, Inc. is testing the new spark-ignition, 11.9-liter dedicated natural gas engine from Cummins Westport, Inc. in this Kenworth T660 tractor, as well as in a Freightliner Cascadia.

“Kenworth continues to work closely with Cummins Westport in the development and testing of this engine to ensure we can offer customers an engine platform that works well with Kenworth chassis,” Kenworth natural gas vehicle marketing manager Michelle Harry said in her firm’s MATS announcement. “This partnership allows us to provide trucks that offer excellent, low-emission solutions combined with outstanding efficiency, horsepower and torque,” she said.

“The ISX12 G will really complete Kenworth’s line of factory-installed natural gas engines, which includes the 15-liter Westport HD and the 8.9-liter Cummins Westport ISL G,” added Andy Douglas, Kenworth national sales manager for specialty markets. “The ISX12 G is a perfect size for the operational needs of those regional and refuse haulers that require a little more power and torque than offered by the ISL G, but that don’t need as much as provided by the HD.”

Target markets at ISX12 G launch are North American regional haul and vocational truck/tractor, and refuse applications, CWI says, “where demand for natural gas vehicles is growing.

15-Liter Spark ISX15 G from Cummins for 2014

“Anticipated end-use applications in the regional haul market segment include intermodal and distribution operation, pickup and delivery,” for the ISX12 G, Cummins Westport says. “Potential post-launch market opportunities include motor coach and specialty vocational applications.”

As for Cummins and its go-it-alone, 15-liter, dedicated-natural gas spark ignition ISX15 G, “Cummins is committed to making the right investments in the technologies that strengthen our leadership position in natural gas,” said Ed Pence, VP and general manager for heavy duty engine business. The Cummins ISX15 G is expected to be in limited production by 2014, states the enginemaker’s release.


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