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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 repurposes the injector camshaft to actuate the Jacobs Intebrake, 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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15 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 ...
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 ...


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
Mon, 15 Sep 2014 00:18:45 -0700

“This is a significant improvement compared with diesel-dual fuel technology, which uses a mix of diesel and only a small amount of natural gas.” He noted the company is working to finalize the development of the Caterpillar C15 and Cummins ISX engine ...
Thu, 11 Sep 2014 07:17:04 -0700

Omnitek Engineering has received approval from the U.S. Environmental Protection Agency for diesel-to-natural gas engine conversions of Detroit Diesel Series 60 engine families for model years 1988 to 2009. The decision allows engine conversions to ...
Transport Topics Online
Thu, 11 Sep 2014 06:48:01 -0700

... 60 business to be from drayage trucks and said it was selected by the Puget Sound Clean Air Agency for an engine conversion pilot project. Omnitek said it also is working to finalize development of Caterpillar C15 and Cummins ISX engine conversion ...
Thu, 21 Aug 2014 00:06:22 -0700

LONDON Aug 19 (Reuters) - Cheap natural gas is starting to revolutionise traffic on U.S. roads, cutting bills for some of the country's heaviest fuel users while reducing carbon emissions and other pollution. The revolution is still in its very early ...

NGT News

NGT News
Fri, 12 Sep 2014 10:37:30 -0700

... NOx emissions of 0.04 gr/bhp-hr per the EPA NTE emissions test protocol) without the use of EGR. According to Omnitek, the company is also finalizing the development of natural gas conversion kits for the Caterpillar C15 and Cummins ISX engine ...

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