A diesel engine is an engine where the fuel is burned inside the core part of the engine such as the cylinders where power is generated. This is also called internal combustion engine. In a diesel engine, the fuel burns inside the cylinders themselves. There is no need to flow heat from where it's generated into the cylinder in internal combustion engine. Therefore, the wastage of energy in internal combustion engine is very little. Here, everything happens in the same place. For this reason, internal combustion engines are more efficient than external combustion engines. By utilizing same amount of fuel, more energy is produced in internal combustion engine. Difference between a diesel engine and a gasoline engine Both diesel and gasoline engines work on the principle of internal combustion, but in little bit different methods. Air and fuel are injected into small metal cylinders in the case of a gasoline engine. A piston compresses the mixture which creates it explosive and a s