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Carburetion, in which the air and fuel are combined long before the air enters the cylinder, or port fuel injection are the two most common fueling methods for lister 6hp diesel engines. In a 6hp diesel engine, all of the fuel is therefore loaded into the cylinder during the intake stroke and compressed. The compression of the fuel/air combination restricts the engine's compression ratio; if it compresses the air too much, the fuel/air mixture spontaneously ignites, resulting in knocking. Direct fuel injection is used in the 6hp diesel engine, which means diesel fuel is injected directly into the cylinder. Because a 6hp diesel engine just compressed air, the compression ratio can be significantly higher.
In 6hp diesel engines the air is compressed at a ratio ranging from 15:1 to 23:1. The increased compression raises the temperature of the air. When the compression stroke is ready to reach its peak, fuel is injected into the hot air. All of this occurs in the combustion chamber on top of the piston. The fuel injector aids in the injection of gasoline into the combustion chamber in minute droplets that are evenly distributed. The compressed air generates a lot of heat, which causes the fuel to evaporate on the surface of the droplets. The vapor is then ignited in the combustion chamber using the same heat. The droplets were vaporized until they were entirely burned. During the first half of the power stroke, combustion happens at a relatively constant pressure. As the combustion process is finished, the combustion gases expand as the piston falls farther; the high pressure in the cylinder forces the piston lower, providing power to the crankshaft.
