The diesel engine (also known as a compression-ignition engine) is an internal combustion engine that uses the compression to initiate ignition and burn the fuel that has been injected into the combustion chamber. This contrasts with spark-ignition engines such as a petrol engine (gasoline engine) or gas engine (using a gaseous fuel as opposed to gasoline), which use a spark plug to ignite an air-fuel mixture.
The diesel engines have the highest thermal efficiency in any internal or external combustion engine because of its very high compression ratio. The low-speed diesel engines that are used in ships and in other applications where the engine weight is unimportant and can have a thermal efficiency of 50%. Diesel engines are …show more content…
Third, because of the fuel injection system the diesel gets burnt completely before leaving the engine whereas in petrol engine some portion with the exhaust is unavoidable.
Diesel engine properties:
1) Energetic- provides large amount of energy.
2) More mileage- gives more and better mileage as compare to any other engine.
3) Lower cost of ownership.
A diesel engine runs on a compression ratio which is much more higher than a petrol engine. In layman terms, it means that more air in the air fuel ratio which goes in the combustion chamber. Since diesel engines work on the compression ignition aspect as opposed to spark ignition petrol engines, diesel tends to burn the complete fuel in the chamber. Hence diesel engines are more fuel efficient than petrol ones.
Diesel engine delivers more torque than a petrol engine
A gas engine first mix fuel-air together and compresses and then it ignites it with the spark. But on the other hand, a diesel engine just compress the air to such a high pressure and temperature that it ignites automatically without any need of a spark. This is the major difference between these two …show more content…
The calorific value of diesel and gasoline is slightly differently from each other. And the thermal efficiencies are also different between these two engines. Spark-ignited petrol/gasoline engines and diesel engines are differ in power rating which is not a major reason behind that same displacement and same speed can be generated from particular amount of power for the engines as similar amount of fuel should be provided and this is been proved theoretically. The main reason behind the spark-ignited petrol/gasoline engines is that they produce higher power with economical reasons, this not related to the first law of