Quote:
Originally Posted by Isaac Zachary
This could not only increase efficiency, but also reduce major diesel pollutants such as NOx and particulate matter at the same time, and do so much more effectively than just spraying water into the intake.
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NOx and PM emissions decrease exactly because the water injection is done into the intake. Injecting it along the fuel won't either cool the charge air which leads to lower NOx, or decrease heat irradiation through the engine coolant (thus retaining a higher amount of energy during the compression stroke to be converted into motion at the power stroke). Such heat conservation also increases the speed of the flame spread, thus leading to a more accurate combustion decreasing the PM emissions.