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.
DEF is heated, pumped and injected into a decomposition tube which then reacts with the exhaust reducing NOX.
[2] Slated to replace X12 in Vocational & Regional Haul Slated to replace L9 [3] Built off the X12 block The Cummins ISX diesel engine can be run in a dual fuel configuration, meaning it can properly operate on diesel fuel and natural gas.
By examining the start of combustion (SOC), the engine's computer is able to employ a predictive ignition delay correlation.
Compensations are made for the natural gas so that the power band and operating range are still functional for customers, while reducing emissions.
[6] Testing has also been done with the Cummins ISX by the EPA for natural gas usage that yielded results of major NOx emissions reduction.
The configuration boasts ninety percent lower NOx emissions than the current EPA standard.
This makes the Cummins ISX that burns natural gas one of the cleanest running diesel engines in the world.
Any non-combustible materials found in lubrication additives will remain in the DPF, which can cause problems with back pressure and efficiency.
[8] The Cummins ISX also utilized DEF, or diesel exhaust fluid, in later models when EPA requirements changed.
The anti backlash gearing makes the engine less noisy due to the reduced rattle while in operation.
The Cummins ISX 15 model equipped with anti backlash gearing suffers a friction loss.