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'''Diesel engines''' are internal combustion [[engine]]s that convert chemical energy into mechanical energy, which  moves pistons up and down within [[cylinder]]s. A diesel engine differs from a gasoline engine in that in a gasoline engine, fuel is mixed with air, compressed by pistons and ignited by sparks from spark plugs. In a diesel engine, however, the air is compressed before the fuel is injected. The fuel ignites because air heats up when it is compressed.<sup>[http://www.howstuffworks.com/diesel1.htm]</sup>

See: [[Internal combustion lift truck]]

==References==
#http://www.howstuffworks.com/diesel1.htm