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The Leading <br />Natural Gas Engine <br />For Truck And Bus. <br />Lower Emissions, Improved Performance, <br />Lower Costs. <br />The ISL G is the natural choice in alternative -fuel engine <br />technology. With industry -leading performance and first -fit <br />OEM availability, it combines all the advantages of clean - <br />burning, low-cost natural gas with the power and torque <br />needed for shuttle and school bus, urban transit, vocational <br />and medium -duty truck and tractor applications. <br />Since the ISL G was introduced in 2007, thousands of truck <br />and bus customers have benefited from the impressive <br />low -end torque, transient response and quiet operation <br />of the ISL G. Today, the ISL G meets current U.S. <br />Environmental Protection Agency (EPA) and California <br />Air Resources Board (ARB) emissions standards, as well <br />as EPA greenhouse gas (GHG) and U.S. Department of <br />Transportation (DOT) fuel -consumption regulations. <br />Dedicated Factory -Built Natural Gas Engine. <br />The ISL G is a dedicated, factory -built natural gas engine, <br />manufactured by Cummins on the same assembly tine <br />as the ISL9 diesel. It shares many components and parts <br />with the Cummins L Series diesels, including the same <br />full -skirted block, for increased rigidity and strength. The <br />design provides superior piston ring and bearing life, <br />improved coolant flow and targeted -piston cooling. For <br />improved reliability and durability, the ISL G features a <br />new heavy duty Exhaust Gas Recirculation (EGR) cooler, <br />redesigned exhaust manifold and gaskets, improved turbo <br />housing and water pump and a newly updated Ignition <br />Control Module (ICM) and sensors. Life -to -rebuild and <br />rebuildability are similar to those of diesel engines. <br />Advanced Combustion Technology. <br />The 8.9-liter ISL G uses Stoichiometric cooled Exhaust <br />Gas Recirculation (SEGR) combustion, leveraging <br />Cummins proven EGR technology to create a high- <br />performance natural gas engine. Stoichiometric <br />combustion is the theoretical or ideal combustion process <br />in which fuel and oxygen are completely consumed, with <br />no unburned fuel or oxygen in the exhaust. <br />The cooled-EGR system takes a measured quantity of <br />exhaust gas and passes it through a cooler to reduce <br />temperatures before mixing it with fuel and the incoming <br />air charge to the cylinder. <br />Cooled EGR, in combination with stoichiometric <br />combustion, provides significant benefits. The use of <br />cooled EGR (in place of large amounts of excess air used <br />in lean -burn technology) lowers combustion temperatures <br />and knock tendency, SEGR combustion also improves <br />power density and fuel economy versus lean -burn and <br />traditional stoichiometric engines. <br />Maintenance -Free Aftertreatment. <br />Another benefit of the ISL G combustion technology <br />is enabling the use of Three -Way Catalyst (TWO) <br />aftertreatment. TWCs are effective, simple, passive <br />devices, packaged as part of the muffler. They provide <br />consistent emissions control performance, are <br />maintenance -free and can be mounted vertically or <br />horizontally on the vehicle. The ISL G does not require <br />active aftertreatment such as a Diesel Particulate Filter <br />(DPF) or Selective Catalytic Reduction (SCR). <br />Three -Way Catalyst Aftertreatment <br />Natural Gas - The Fuel Choice Is Yours. <br />The ISL G operates on 100 percent natural gas, which can <br />be carried on the vehicle in either compressed (CNG) or <br />liquefied (LNG) form. The ISL G can also run on renewable <br />natural gas (RNG) made from biogas or landfill gas that has <br />been upgraded to vehicle -fuel quality. To meet engine fuel <br />requirements under a variety of load conditions, the engine <br />requires the fuel storage system to provide at engine fuel <br />pressure at rated conditions between 70 psi and 150 psi. <br />CNG LNG <br />