What ignition method do diesel engines primarily use?

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Multiple Choice

What ignition method do diesel engines primarily use?

Explanation:
Diesel engines rely on compression ignition. The air inside the cylinder is squeezed to a very high pressure and temperature, and fuel is injected into that hot, highly compressed air. The fuel auto-ignites without any spark or external ignition source. Spark ignition would require a spark plug and timing, which diesel engines don’t use. Glow plugs aren’t the ignition method themselves; they merely help heat the chamber to aid starting in cold conditions. External ignition isn’t a feature of diesel operation.

Diesel engines rely on compression ignition. The air inside the cylinder is squeezed to a very high pressure and temperature, and fuel is injected into that hot, highly compressed air. The fuel auto-ignites without any spark or external ignition source.

Spark ignition would require a spark plug and timing, which diesel engines don’t use. Glow plugs aren’t the ignition method themselves; they merely help heat the chamber to aid starting in cold conditions. External ignition isn’t a feature of diesel operation.

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