There are several reasons why diesel engines do not need electric ignition systems.
* Diesel fuel has a higher flash point than gasoline. This means that it takes more heat to ignite diesel fuel than it does to ignite gasoline. The compression ratio in a diesel engine is much higher than the compression ratio in a gasoline engine, which provides the necessary heat to ignite the diesel fuel.
* Diesel engines have a longer ignition delay period than gasoline engines. This means that there is a longer period of time between the injection of the fuel and the actual ignition of the fuel. This delay period gives the fuel time to mix with the air and reach a combustible mixture.
* Diesel engines are not as sensitive to ignition timing as gasoline engines. This means that the timing of the fuel injection is not as critical in a diesel engine as it is in a gasoline engine. This makes diesel engines more tolerant of variations in engine speed and load.
In conclusion, diesel engines do not need electric ignition systems because they use a compression ignition system. This system is more efficient and reliable than an electric ignition system, and it is less sensitive to variations in engine speed and load.
