Cummins ISX History
The Cummins ISX's past
Throughout Cummins’ history the company's top diesel engine has been the Cummins ISX Engine. The engine faces challenges despite being a workhorse.
The popular N14 Series was superseded in 2001 by the Cummins ISX Engine. Since the Cummins N14 was such a fantastic engine, diesel engine enthusiasts adored it for a very long time. The N14's discontinuation was caused solely by the EPA's passage of stricter emissions regulations, which made the engine obsolete. The ISX was once marketed as the "Signature" series due to the ground-breaking fuel system known as the "Interact System," which is utilized for on-highway operations. As a result, engines used in off-highway applications such as industrial, generators, pumps, oil & gas, agriculture, and marine engines use the QSX, or "Quantum System."
The ISX engine has a 430–620 hp power range and a 2050 lb–ft maximum torque. The QSX engine may produce 375–665 horsepower and up to 1875 lb-ft of torque. For a limited time, Cummins offered an ISX model with 650 horsepower and 1950 lb-ft of torque exclusively for RV applications. The engine was discontinued as a result of its unreliability. Additionally, there was no extended warranty for the RV engines. Despite the fact that Cummins had numerous answers for various issues, they eventually decided it was not profitable.
In order to take into account developments in the field of emissions technology, the ISX engine received yet another redesign in 2010. From 2001 until 2010, the engine utilized a dual overhead camshaft setup, with one cam actuating the injectors and the other the valve train components. In the high pressure injection system, cam actuation is used to generate injection pressure. Timing meters, a lift pump, a shutdown valve, a gear pump, pressure regulators, and pressure regulators are all components of the ISX's exceedingly complex fuel system, which supplies pressurized fuel to the injectors. The single overhead camshaft was the main focus of the 2010 ISX redesign. A common rail fuel system's development eliminated the need for an injector camshaft to pressurize gasoline. The common rail fuel system pressurizes diesel fuel using a multiple piston pump before delivering it via tubing to a rail system where it is maintained at high pressures of up to 30,000-35,000 psi. By improving fuel economy, the fuel system improvement reduced emissions.
The ISX's pollution control systems are challenging, to put it politely. This technology was used to create one of the first heavy duty diesel engines with an EGR (Exhaust Gas Recirculation) Cooler system. The EGR cooler collects exhaust gas, which is then recirculated into the intake chamber. Cooled exhaust gas lowers the temperature of the combustion chamber, which reduces the formation of NOx particles. The EGR Cooler technology came first.
The following piece of emissions equipment was released for the ISX 871 in 2008 when the Diesel Particulate Filter or a comparable device was introduced (DPF). The DPF gathers particulate exhaust materials produced in the combustion chamber. The soot is neutralized by the oxidation process, a chemical reaction. After the soot has been oxidized and reduced to a fine dust, the turbo regenerates it. The process is known as regeneration. Numerous claims that the SCR is unnecessarily sophisticated and lowers the engine's horsepower have been made throughout the years. This technology has added a lot more rotating parts, and they can break easily and cost a lot of money to restore.
The ISX Engine has kept up with the installation of more recent emissions technologies in order to meet with changing EPA regulations. In 2010, the ISX15 was the first Cummins engine to utilize the Selective Catalytic Reduction system. (SCR). To power the SCR, urea is instantly pumped into the exhaust. Urea is the main ingredient in diesel exhaust fluid (DEF). The ammonia-based urea chemically reacts with the NOx exhaust particles inside the catalytic converter to change them into nitrogen and water. The SCR is composed of a storage tank, a pump, an electronic controller, and an injector nozzle. Warm DEF is pumped from the holding tank to an injector, where it is injected into a decomposition tube and combined with exhaust NOx. There have been several issues with emission technology over time. One of the ISX's typical problems is that the turbo's inlet becomes clogged with exhaust that is pumped back into the engine during turbo regeneration. When this occurs, the engine may start to lose horsepower or, less frequently, stop functioning altogether.
Cummins launched two heavy-duty engine models in 2016: the X12 and X15. The series of engines will offer a 3% increase in fuel efficiency over the ISX and be in compliance with 2017 EPA standards. The variants will be offered with 405-605 horsepower. The moment being, Cummins doesn't have any plans to gradually phase out the older ISX technology because it will likely remain around for some time.
