• It’s Not All About Diesel: Cummins ISL G Near Zero Emission Engine Runs on Natural Gas [News]


    Cummins Westport: ISL G Near Zero engine

    Cummins Westport division debuts a Near Zero emissions version of their ISL G engine at this week’s 2017 NTEA Work Truck show. The engine received EPA and CARB certification of 0.02 g of NOx per horsepower per hour, which earns a designation of “near zero” emissions.

    You may think of pickup truck and semi truck turbo-diesel engines, when you hear the Cummins name. The company is well known for powerful diesel engines across various classes of trucks. Cummins is an engine and powertrain specialist, but they offer a wide variety of power solutions and components: heavy equipment engines, marine engines, power generators, and much more. The Cummins Westport division is specializing in engines powered by natural gas.

    Here are the specifications for the ISL G Near Zero engine. This 8.9L turbocharged inline-6 engine comes in five distinct power levels. This engine is meant for medium duty commercial applications, such as in school bus and waste management trucks. It’s no slouch, as the top power rating is 320 hp @ 2,000 rpm and 1,000 lb-ft of torque @ 1,300 rpm.

    Here is a closer look at the Cummins turbo-diesel engine factory in Columbus, Indiana. One of the engines that is produced here is the 5.0L V8 turbo-diesel that is used in the Nissan Titan XD.


    Andre Smirnov
    Andre Smirnov
    Andre Smirnov is an Automotive Enthusiast, Producer, Reviewer, Videographer, Writer, Software Engineer, Husband, Father, and Friend.

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    18 thoughts on “It’s Not All About Diesel: Cummins ISL G Near Zero Emission Engine Runs on Natural Gas [News]

    1. A diesel engine converted to run like a gasoline engine on NG as a fuel, sparkplug changes every 22,500 miles for refuse work.
      http://www.cumminswestport.com/models/isl-g
      Sat in on a presentation of a refuse company in Winnipeg that had up to 50% downtime in cold weather due to no starts. Standard 20 amp electrical outlets couldn’t get enough heat into the engine to ensure starts in temps below -10 F.

        1. You are probably right. I know a few guys stuffed a CAT 7.2L under the hood of a super duty. All 1500 lbs of it. Still, this new Cummins would be a beast under the sexy new F-650 as well. Yes, Ford has used Cummins before.

    2. It’s probably gonna years to put into production for smaller vehicles but NG is a good way to go. It’s plentiful in the US and is cheaper than foreign oil. The problem is too many powerful people are making lots of money with gas autos and those groups aren’t going to change easily.

    3. The ‘problems’ with widespread adoption of natural gas are basically 2 fold. #1 The US has trillions of $ of infrastructure invested in the distribution of gasoline. Try to take a trip across the country in a NG vehicle, from a fuel point of view it would likely take more planning than doing the same in a Tesla. This will just take time to change. #2 There are less BTU’s per volume in natural gas. Which means the range of NG conversion vehicles are much less than their gasoline counterparts right now. For example a simple trip from say Dallas to Houston in a NG car would take at least 1-2 additional fuel stops vs their gasoline counterpart. Which ties back to #1, where do you stop for NG along the way?

      The bast way forward for NG is exactly what we are seeing. Adoption of NG by local buses, and waste trucks, etc. Basically any industry where the vehicles stay in a small radius from a central station, they can add larger NG tanks on the vehicles themselves, and install central refuel point at place convenient to refill when needed.

      NG is a clean fuel with abundance in the US, but it does have its drawbacks when compared to other fuels.

      1. Also, the only way to store enough of it currently is to either compress it to very high pressures (3600 PSIG typical) or super cool it so that it liquefies (-260 degree F or colder). Both process require very expensive equipment and a tremendous amount of electricity (I believe somewhere in the neighborhood of 40% of the energy contained in the NG itself). Also, either type of tank is expensive and bulky. Still, NG is cheap enough in some areas that you can come out ahead.

    4. Hmmm, a turbo-CNG I6 may be in the works for Ram…or Nissan. Wishful thinking, but it may direct attention away from recent diesel scandals.

    5. The “Rolling Coal Dirtbags” will find out quickly how to bypass emissions for their immature entertainment.

      1. Last I heard, upcharge on this engine and associated storage tanks, plumbing etc. is $50,000. It would never be sold in a pickup truck.

    6. I wonder what the HP and Torque curves look like on theses things below the peaks before and after the low rpms. The final gear ratios would be really different as well. Interesting motor option.

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