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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 reducing NOX. The ISX15 CM2250 and CM2350 has eliminated the injector camshaft due to the advent of the common rail fuel system in which the fuel is pressurized from a high pressure, multiple piston pump, transferred through 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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120 news items

Fleet Owner
Mon, 29 Sep 2014 07:03:45 -0700

A new dual-fuel conversion system from Skygo Fuel Systems has been approved for use with 2007-2009 Cummins ISX engines, the company said. According to Skygo, the EPA has given the green light to the system, which provides up to a 60% displacement ...


Fri, 03 Oct 2014 10:13:58 -0700

The best current 15-liter truck engine is the Cummins ISX, with 43.4% BTE, but Achates is projecting 51.5% BTE for an engine of comparable power. (A 50% BTE target is one of the goals of the U.S. Department of Energy's SuperTruck program, and so far ...


Mon, 13 Oct 2014 10:48:11 -0700

When we launched [trucks with the SCR-equipped] Cummins ISX in 2013, despite the fact it was a well-known engine, we didn't gain a lot of traction for eight or nine months. The market would not shortcut the need of fleets to try units out and to test them.
Natural Gas Intelligence
Fri, 26 Sep 2014 07:15:00 -0700

Separately, Columbia, SC-based Skygo Fuel Systems announced a newly certified dual-fuel system related to Cummins ISX engines, and Bend, OR-based Onboard Dynamics has developed a system to allow NGV engines to produce compressed natural ...
Capital Press
Thu, 18 Sep 2014 17:00:00 -0700

Pan-American Berry Growers is one of two farms that paid the U.S. Department of Labor a total of $230,000 to settle 'hot goods' claims. Those settlements have been set aside, but the DOL says it can't return all the money because its paid some of it to ...

Truck News

Truck News
Mon, 29 Sep 2014 15:58:21 -0700

The greatest example of this heightened level of collaboration comes in the form of the SmartAdvantage powertrain, which combines the Cummins ISX with an optimized Fuller Advantage Series automated transmission. That package has met with some ...


Wed, 24 Sep 2014 14:00:00 -0700

The system is an aftermarket upgrade for 2007-2009 Cummins ISX engines and reduces emissions by up to 20% by using a natural gas substitution up to 60%, according to the EPA. The Skygo system substitutes natural gas for diesel with no loss of power or ...
The Trucker
Sun, 05 Oct 2014 10:26:15 -0700

Calvin spoke of increased acceptance of CNG in the trucking industry, mentioning the Cummins ISX G engines, including the ISX12G now in development as a reason that more carriers could spec natural gas engines in new equipment orders. Zobel spoke ...

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