How Diesel Engines Work When gas is compressed, the temperature of it will rise, with diesel engines using this very property to ignite the fuel. Air is then drawn into the cylinder and compressed by the rising piston at a much high compression ratio than gas engines, up to 25:1, with the air temperature reaching 700 – 900 degrees C. At the top of the piston stroke, the diesel fuel is injected into the combustion chamber at high pressure, then through an atomizing nozzle, it mixes with the hot high pressured air. The resulting mixture will ignite and burn very rapidly. This combustion will cause the gas in the chamber to heat up rapidly, which increases the pressure and forces the piston downwards. The connecting rod will transmit this motion to the crankshaft. The scavenging of the engine is either done by ports or valves. To get the most out of a diesel engine, use of a turbocharger to compress
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