Cummins Westport is a joint venture of Cummins whose research includes alt fuels, low-emissions technologies and engines operating on compressed natural gas (CNG), liquefied natural gas (LNG), hydrogen, and even landfill gas.
Wayne Gerdes -
CleanMPG - Oct. 7, 2012
The Peterbilt 384 is lightweight and powerful for easy handling of the heaviest payloads and available with the Cummins-Westport ISL G 8.9L natural gas fueled engine.
Earlier this week Cummins Westport announced it has begun “
development” on the ISB6.7 G, a mid-range 6.7L natural gas engine designed to meet demand for on-highway vehicles powered by lower cost, cleaner and increasingly abundant natural gas.
The ISB6.7 G engine will be based on the Cummins ISB6.7 diesel engine (read RAM HD Pickup trucks) and will use Cummins Westport's proven spark-ignited, stoichiometric cooled exhaust gas recirculation (SEGR) technology. Exhaust aftertreatment will be provided by a simple, maintenance-free three-way catalyst.
The engine will run on compressed natural gas (CNG), however, the natural gas may be stored on the vehicle in liquefied natural gas (LNG) state or as CNG. The ISB6.7 G is expected to be in production by 2015 and will be designed to meet Environmental Protection Agency (EPA) and California Air Resources Board (CARB) regulations in force at the time of launch.
Jim Arthurs, President of Cummins Westport said the following in a prepared statement:
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"It joins the 8.9-liter ISL G, with over 16,000 engines in service, and the 11.9L ISX12 G, which will start production in 2013, to give our customers a broad range of natural gas engines for on-highway applications."
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ISX12 G
The ISX12 G is a 12L heavy-duty, factory built dedicated natural gas engine for regional haul truck / tractor, vocational and refuse applications. The new ISX12 G is currently in field trials with full production expected to commence in early 2013.
With a displacement of 11.9L and up to 400 HP and 1450 lb-ft, the ISX12 G natural gas engine is based on the Cummins ISX12 diesel engine platform which is the newest member of Cummins heavy duty engine family. The ISX12 G will operate exclusively on natural gas (CNG or LNG) utilizing Cummins Westport’s proprietary (SEGR) technology, first introduced in the 8.9L ISL G.
ISL G
The ISL G is available as a factory option from leading bus and truck manufacturers and its ability to operate on compressed natural gas (CNG), liquefied natural gas (LNG), or renewable natural gas (RNG) or Biomethane has made it the leading natural gas engine in North America.
Key features include power ratings from 250 to 320 HP and up to 1,000 lb-ft of torque, diesel-like performance, and meeting global low emission standards with the use of a standard three way catalyst.
ISL G Ratings
| Engine Model | HP @ rpm | Peak Torque (lb-ft @ rpm) | Governed RPM |
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ISL G 320 | 320@2000 | 1000@1300 | 2200 RPM |
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ISL G 300 | 300@2100 | 860@1300 | 2200 RPM |
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ISL G 280 | 280@2000 | 900@1300 | 2200 RPM |
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ISL G 260 | 260@2200 | 660@1300 | 2200 RPM |
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ISL G 250 | 250@2200 | 730@1300 | 2200 RPM |
Another key feature(s) of the ISL G-series engines is their maintenance intervals. Oil and both the Oil and Coolant Filter are spec’ed for 15,000 miles, fuel filter at 30,000 miles, spark plugs at 45,000 miles, coolant swap at 60,000 miles and an initial valve adjustment at 30,000 miles with 60,000 mile services thereafter.
Natural gas is an abundant, cost effective, low carbon and low emissions fuel sourced mostly from within the 48-contiguous states making it not just clean but also secure.
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