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- Spark Plugs: In a gasoline engine, spark plugs provide the spark that ignites the fuel-air mixture in the combustion chamber. This spark is created by an electrical current passing through the spark plug, which generates a spark that jumps across a small gap between the electrodes. The spark occurs when the piston is in the ideal position and the mixture is at the right pressure, and this helps to ensure the most efficient combustion possible.
- Why don’t diesel engines have spark plugs? Diesel engines don’t rely on spark plugs to ignite the fuel. Instead, they use a process called compression ignition. This means that the fuel is injected into the combustion chamber while the air is being compressed. As the air is compressed, it heats up, and when the fuel is injected, it combusts spontaneously, creating the power needed to move the pistons. This is why diesel engines are often referred to as compression-ignition engines.
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