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The Cummins ISX is an Inline (Straight)-6 diesel engine produced by Cummins for heavy duty trucks and motorcoaches, replacing the N14 in 2001 when emissions laws passed by the EPA made the engine obsolete. Originally called the "Signature" series engine, the ISX uses the "Interact System" (hence the "IS" which is the moniker for the full authority, on highway fuel system Cummins pioneered) to further improve the engine. This engine is widely used in on highway and vocational trucks and is available in power ranging from 430 hp all the way to 620 hp 2050 ft/lbs. The QSX is the off-highway version of the ISX with the Q standing for Quantum. The QSX is used for industrial, marine, oil & gas and other off-highway applications.

Until 2010 this engine was a dual overhead cam design with one cam actuating the injectors and the other the valve train. This injection system is known as HPI (high pressure injection) where the injectors are cam-actuated to create injection pressure. The fuel system uses an Integrated Fuel System Module (IFSM) with a lift pump, gear pump, pressure regulators, shutoff valve, metering and timing actuators to deliver fuel to the injectors. It has a one piece valve cover that is either plastic or on older models a chrome plated steel cover otherwise known as the Signature 600 or ISX CM570.

In 2002, the ISX CM870 brought cooled Exhaust Gas Recirculation (EGR) which takes exhaust gas and recirculates it back into the intake of the engine lowering the combustion chamber temperatures limiting the formation of NOx.

In 2008, Cummins unveiled the ISX CM871, this engine featured a Diesel Particulate Filter (DPF) which trapped the particulate matter or "soot" produced in the engine. With the help of the Diesel Oxidation Catalyst (DOC) the soot trapped in the DPF is oxidized and turned to ash during a process called regeneration.

The current EPA 2010 version known as ISX15 CM2250 features enhanced Exhaust Gas Recirculation, Diesel Particulate Filter and Selective Catalytic Reduction (SCR), also known as Urea Injection. SCR consists of a Diesel Exhaust Fluid (DEF - composed of urea and water) injection system: holding tank, pump, controller, and injector and an SCR catalyst brick. DEF is heated, pumped and injected into a decomposition tube which then reacts with the exhaust in the SCR catalyst to reduce NOx. The ISX15 uses only one camshaft rather than two, like previous models, due to the advent of the common rail fuel system in which the fuel is pressurized from a high pressure, multiple piston pump, transferred thru tubing to a rail where fuel is stored under extremely high pressures up to 35,000 psi.

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Cummins_ISX — Please support Wikipedia.
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6 news items

Transport Topics Online
Wed, 16 Apr 2014 06:48:59 -0700

Autocar is recalling 4,100 natural gas-powered trucks as the initial major recall of Cummins Westport ISL G and Cummins' ISX 12 G is expanded. The recall to correct the possible freezing of moisture in the intake manifold was reported to the National ...
Mon, 14 Apr 2014 16:26:15 -0700

Company founder Ed VanDyne took Bennet on a tour of the research facility at 3755 Precision Drive in northeast Loveland, explaining the concept of his SuperTurbo invention and showing a prototype attached to a Cummins ISX diesel engine — commonly ...
TriValley Central
Wed, 16 Apr 2014 01:08:33 -0700

When the driver of this new coach put pedal to metal, he was asking a U.S.-made Cummins ISX 12-liter, 425-horsepower engine to take us uphill using a Generation-Five Allison B500 6-speed automatic transmission, also made here. I enjoyed the quiet, ...
Mon, 07 Apr 2014 07:22:16 -0700

Most importantly, the addition of the Cummins ISX and the ISB to the engine portfolio will continue to increase market share. On the downside, Navistar International is seeing operational cost increments related to ongoing changes in the on-highway ...
Australasian Transport News (subscription)
Thu, 27 Mar 2014 20:45:00 -0700

It's been a while since we last climbed behind the wheel of an Iveco prime mover and the last one I tested was the bonneted Powerstar 6800 ISX powered by the 15 litre Cummins ISX EGR engine. During this drive I kept wondering why this truck isn't more ...
Grand Forks Herald
Thu, 03 Apr 2014 21:36:25 -0700

Read more. 2005 T800 KW, Cummins ISX, 450 hp, 10 speed, 3:70 rearends, 38 inch bunk, 2 line wet kit, good brakes & drums, rebuilt front pins & bushing. Read more. Mycorrhizal Seed Inoculants Refer to this ad to receive a $100.00 reduction on every ...

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