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Diesel Engines don't have spark ignition. Diesels compress the air in the combustion chamber until it's hot enough that the fuel will self ignite on injection. Some diesels have glow rods to enable then to achieve ignition at slightly lower compression, making them run a bit smoother.

Spark ignition, as in a gasoline engine is when you haven't got enough compression for self-ignition, so you add a spark to ignite the fuel-air mixture instead.

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