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Diesel engines are becoming the predominant power behind modern tractors simply because they have the highest thermal efficiency of the internal or external combustion engine, due to their higher than normal compression ratio. Unlike gasoline engines, the diesel engines in tractors use highly compressed hot air to ignite the fuel as opposed to spark plugs. If you do not like the image currently showing, right-click on the desktop again and choose "Next desktop background" to see another one. The images will cycle automatically after an interval giving you something stunning to look at.