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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 regulations 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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238 news items

Automotive World (press release)
Mon, 27 Jul 2015 10:03:45 -0700

Following the 1,050 truck order announced last week, International Truck today announced it has finalized the remaining 7,950 orders from Quality Companies, Inc., a wholly owned subsidiary of Celadon Group, Inc. “Quality Companies, LLC recognizes what ...

Commercial Carrier Journal

Commercial Carrier Journal
Tue, 28 Jul 2015 05:56:15 -0700

The 9,000 vehicle commitment consists primarily of International ProStar and LoneStar tractors powered by Cummins ISX-15 engines, Navistar says, and will be spread across the next three years. Navistar's announcement is good news for a company that's ...
Fri, 24 Jul 2015 11:27:43 -0700

Those relationships with Navistar and others have led the company to spec a new axle from Dana and get a retrofit calibration for its Cummins ISX engines that allows the trucks to use “coast mode” going downhill. “You build relationships with all these ...


Wed, 22 Jul 2015 14:55:53 -0700

The order will consist of International ProStar and LoneStar trucks powered by Cummins ISX-15 engines. "This customer has experienced our new products firsthand and their International models are leading the way in fuel economy performance when ...
Monitor Daily
Fri, 24 Jul 2015 04:26:15 -0700

The orders would consist primarily of International ProStar and LoneStar vehicles powered by Cummins ISX-15 engines and spread across the next three years. “Customers continue to recognize that the heavy-duty products we are building today are among ...

Fayetteville Flyer

Fayetteville Flyer
Wed, 15 Jul 2015 07:37:30 -0700

Ladder 3 is a 75-foot heavy duty ladder truck mounted on an Arrow XT chassis with a 500-hp Cummins ISX engine. It is equipped with a Pierce PUC pump capable of delivering 1,500 gallons of water per minute, and a 500-gallon on-board water tank.

Fleet Equipment Magazine

Fleet Equipment Magazine
Wed, 01 Apr 2015 09:45:59 -0700

Donaldson Co., manufacturer of filtration systems and parts, announced the company's ground-breaking fuel filtration technology is available for Cummins ISX engines. There are two Donaldson Blue fuel filters available: The DBF5811 for 15.0-liter ISX ...
Fleet Owner
Mon, 29 Sep 2014 07:13:36 -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 ...

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