* Fuel: Diesel engines use diesel fuel, which is a type of heavy oil. Petrol engines use petrol, which is a type of light oil.
* Compression ratio: Diesel engines have a higher compression ratio than petrol engines. This means that the fuel and air mixture is compressed to a higher pressure in a diesel engine, which makes the engine more efficient.
* Injection: In a diesel engine, the fuel is injected directly into the cylinder. In a petrol engine, the fuel is mixed with air before it is injected into the cylinder.
* Ignition: In a diesel engine, the fuel is ignited by the heat of compression. In a petrol engine, the fuel is ignited by a spark plug.
* Efficiency: Diesel engines are more efficient than petrol engines. This means that they produce more power for the same amount of fuel.
* Emissions: Diesel engines produce more emissions than petrol engines. This is because the fuel is not completely burned in a diesel engine, which produces soot and other pollutants.
* Noise: Diesel engines are louder than petrol engines. This is because the fuel is ignited more rapidly in a diesel engine, which produces a higher pressure wave.
In general, diesel engines are more efficient and powerful than petrol engines. However, they also produce more emissions and are louder. Petrol engines are less efficient and powerful than diesel engines, but they produce fewer emissions and are quieter.
