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Diesel knock is the clanking, rattling sound emitted from a running diesel engine. This noise is caused by the compression of air in the cylinders and the ignition of the fuel as it is injected into the cylinder. This is much the same as a gasoline engine suffering from pre-ignition or spark knocking. The timing of the fuel being injected into the diesel engine is critical to prevent parts breakage, which can result from severe knock.A diesel engine functions differently than its gasoline counterpart. In a gasoline engine, fuel is mixed with air and then compressed before an electric spark ignites the mixture. In a diesel engine, only the air is compressed. The fuel is then injected into the cylinder filled with compressed air, and the heat from the compressed air ignites the fuel without the aid of an electric ignition.The telltale sound of an operating diesel engine is due in part to the fuel injection process. By injecting raw fuel into extremely hot compressed air, the fuel ignites as the piston is still traveling up in the cylinder, causing a detonation and subsequent rattling sound to be heard. The process is compression driven, and the higher the compression ratio within the cylinder, the greater the power output of the engine.
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