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Message: <blockquote data-quote="patgwh" data-source="post: 654826" data-attributes="member: 28142">Food for thought:When working on his calculations, Rudolf Diesel theorized that higher  compression leads to higher efficiency and more power. This happens  because when the piston squeezes air with the cylinder, the air becomes  concentrated. Diesel fuel has a high energy content, so the likelihood  of diesel reacting with the concentrated air is greater. Another way to  think of it is when air molecules are packed so close together, fuel has  a better chance of reacting with as many oxygen molecules as possible.  Rudolf turned out to be right -- a gasoline engine compresses at a ratio  of 8:1 to 12:1, while a diesel engine compresses at a ratio of 14:1 to  as high as 25:1.Interpreted: Diesel rocks!!! :rock:Sourced: <a href="http://www.howstuffworks.com/diesel1.htm" target="_blank">http://www.howstuffworks.com/diesel1.htm</a></blockquote>