The ISL G is the newest evolution of alternative fuel engine technology, combining all the advantages of clean-burning, natural gas engines with "no compromise" performance for medium duty truck, refuse truck, shuttle bus, urban transit, school bus, vocational and urban truck/tractor pick up-and-delivery applications. The ISL G meets current U.S. Environmental Protection Agency (EPA) and California Air Resource Board (ARB) emission standards and EPA greenhouse gas (GHG) and U.S. Department of Transportation (DOT) fuel consumption regulations.

Ratings range from 250-320 horsepower (186-239 kw). Standard features include proven wastegate turbo technology for impressive low-end torque and transient response, with an increase in fuel efficiency. These features give the ISL G outstanding reliability and durability.

Plus, the ISL G sets a new benchmark for lower alternative fuel vehicle life cycle costs. In high fuel use applications, the combination of lower alternative fuel costs, improved fuel economy and lower incremental maintenance costs make it possible to save valuable dollars with a natural gas powered fleet. The ISL G can also operate on biomethane -- renewable natural gas made from biogas or landfill gas that has been upgraded to pipeline and vehicle fuel quality.  Biomethane fuel is carbon dioxide (CO₂) neutral.

As with all our alternative fuel engines, the ISL G comes with one of the best base warranties in the industry.  All backed by the largest customer support network in the industry. 

Considering a Cummins engine purchase? For more information including pricing and additional technical information, please contact your Cummins representative. If you need help finding a representative, the Cummins Sales and Service Locator tool can help.

Features & Benefits

• Air Intake System: Charge air cooling reduces emissions by lowering intake manifold air temperatures.

• Accessory Belt Drive System: Self-tensioning serpentine polyvee belt accessory drive system for water pump, engine-mounted fan hub and most alternators.

• Three-Way Catalyst: Required for all models. Certified to US EPA 2010 standard and California Air Resources Board standards. Meets EPA useful life requirement of up to 290,000 miles (464,000 km) in transit applications with no scheduled maintenance.

• High Energy Ignition System: Provides better performance and longer service intervals, improved spark plug and coil durability, plus self-diagnostics.

• High Efficiency Lube Cooler: Lowers oil temperatures for longer engine life.

• Control System: Full drive-by-wire. Electronic Control Module (ECM) provides full monitoring and control of engine sensors, fuel system and ignition system. Full interface capability to Cummins INSITE™ and QuickCheck diagnostic service tools. Control Module provides OEMs and end users with the ability to tailor performance of the engine to fit the vehicle mission.

• Crankshaft: Eight counterweight, fully balanced, high-tensile-strength steel forging with induction-hardened fillets and journals for outstanding durability.

• Oil Filter: The combination full-flow and bypass oil filter improves filtration while minimizing oil filter replacement and disposal costs.

• Wastegated Turbocharger: With electronic control for precise air handling. Water-cooled bearing housing for durability.

• The 8.9 liter ISL G uses stoichiometric cooled Exhaust Gas Recirculation combustion (EGR) leveraging Cummins proven EGR technology to create a high-performance natural gas engine.

  The cooled EGR system takes a measured quantity of exhaust gas, passes it through a cooler to reduce temperatures before mixing it with the incoming air charge to the cylinder. The use of cooled EGR (in place of large amounts of excess air) not only lowers combustion temperatures like our current Lean Burn technology, it also allows the creation of oxygen-free exhaust, which in turn allows for the use of a Three Way Catalyst (TWC). TWCs are simple passive devices that are maintenance free and have been commonly used in passenger cars since the 1970's.

  Stoichiometric cooled EGR combustion improves power density as well as fuel economy - important benefits that fleets will enjoy every day. In fact, low speed torque is improved by over 30% compared to previous engines.