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What does a diesel engine use to ignite the fuel with since it spark plug?

Diesel engines don't use spark plugs to ignite the fuel. Instead, they rely on compression ignition. Here's how it works:

1. Air Compression: The diesel engine compresses air in the cylinder to very high pressures (typically 15-25 times atmospheric pressure). This compression generates significant heat.

2. Fuel Injection: At the precise moment of maximum compression, fuel is injected into the hot, compressed air.

3. Auto-Ignition: The high temperature of the compressed air is enough to spontaneously ignite the fuel, creating a controlled explosion that drives the piston down.

So, the heat generated by compression is the primary factor in igniting the fuel in a diesel engine, unlike the spark plug used in gasoline engines.

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