You don't often see the words "clean" and "diesel" put together like that, but get ready for some big changes to the diesel landscape. Starting in October 2006, gas stations and truck stops will sell ...

Water injection is a tried-and-true method for cleaning up the combustion process in a diesel engine. It reduces both combustion temperatures and the resulting particular emissions. But what if you ...

Scientists are exploring a surprisingly simple way to clean up diesel engines: adding tiny droplets of water to the fuel. During combustion, the water rapidly vaporizes, triggering micro-explosions ...