The diesel engine remains one of the most widely used engines today, as it is used in passenger cars, commercial vehicles, agricultural machinery, ships, and industrial applications. Like the petrol engine, the diesel engine converts chemical energy into thermal energy, which is then transformed into mechanical energy via pistons to drive the vehicle.
The petrol engine remains the most widely used engine in passenger vehicles. By burning fuel, it converts chemical energy into thermal energy, which is then transformed into mechanical energy via pistons to drive the vehicle.