The soot is oxidized and turned into a fine dust which is then regenerated through the turbo. The soot is neutralized through the chemical process known as oxidation. The DPF traps particulate exhaust matter produced in the combustion chamber. The next piece of emissions technology appeared in 2008 in the ISX 871 with the introduction of the Diesel Particulate Filter or (DPF). The EGR Cooler technology was the first introduced in 2002 The presence of cooled exhaust gas lowers the temperature in the combustion chamber thus reducing NOx particles. The EGR cooler takes exhaust gas and recirculates it back into the intake chamber. The design was one of the first heavy duty diesel engines to incorporate an EGR Cooler (Exhaust Gas Recirculation) system into the engine. The emission systems on the ISX are complex to say the least. The change in the fuel system allowed for great fuel economy and thus reduced emissions. With the common rail fuel system diesel fuel is pressurized from a multiple piston pump where it is then distributed through tubing to a rail system where it is stored under high pressures up to 30,000-35,000 psi. The innovation of the common rail fuel system eliminated the need to have the pressurized fuel from an injector camshaft. The 2010 the ISX redesign centered around a single overhead camshaft. The fuel system of the ISX is quite complicated encompassing the gear pump, pressure regulators, shutoff valve, lift pump and timing meters to deliver pressurized fuel to the injectors. The high pressure injection system is cam actuated to create injection pressure. From 2001-2010 the engine was a dual overhead camshaft design where one cam triggered the injectors and the other the valve train components. In 2010 the ISX engine was redesigned once again to accommodate improvements in the emissions technology. Cummins had several workarounds for various issues but eventually decided it was not profitable. There was also no extended warranty coverage for the RV engines. The engine was discontinued because it was proven to be unreliable. Cummins briefly produced a version of the ISX especially for RV applications which made 650 hp at 1950 lb-ft of torque. The QSX engine produces 375-665 hp with a maximum 1875 lb-ft of torque. The ISX engine makes 430-620 hp with a maximum 2050 lb-ft of torque. Consequently the QSX or “Quantum System” is used in off-highway applications of the engine such as industrial, generators, pumps, oil & gas, agriculture and marine engines.
#2012 freightliner cummins isx egr remover series#
The ISX was originally called the “Signature” series due to the revolutionary fuel system known as the “Interact System” The IS in ISX stands for the Interact System and is in use for on-highway applications. The only reason for the discontinuation of the engine was the EPA passed stricter emissions regulations that made the N14 outdated. The Cummins N14 was a fantastic engine and beloved by diesel fans for many years. The Cummins ISX Engine first debuted in 2001 replacing the popular N14 Series. The engine is a workhorse but not without its issues. For 16 years now the Cummins ISX Engine has been the flagship diesel engine in Cummins Fleet.
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