A simple way to clean up diesel engines is by adding tiny droplets of water to the fuel. During combustion, the water rapidly vaporizes, triggering micro-explosions that improve fuel mixing and lower combustion temperatures. This can slash nitrogen oxide and soot emissions by more than 60%, sometimes even improving engine efficiency. It works in existing engines without redesign, so could provide a quick path to cleaner diesel use.
www.eurekalert.org/news-releases/1104306