Difference Between Petrol Engine and Diesel Engine:
Diesel Engine: Diesel Engine or Compression or Ignition Engine In a diesel engine, the air inside the cylinder is compressed to very high pressure (40-45 kg/sq cm).The high pressure causes the compressed air to heat up to almost red hot or 600°C. In this condition, diesel fuel is injected into the vaporizer at a higher pressure.The fuel is ignited instantly by the high heat of the compressed air.
Detailed difference between Diesel Engine and Petrol Engine:
Detailed differences between Diesel and Petrol Engines are given below:-
|The cylinder only takes air and does not require a carburetor.
|The cylinder receives a mixture of fuel (petrol) and air. A carburetor creates a mixture of petrol and air.
|Fuel is injected through injectors to ignite compressed air.
|The compressed mixture is ignited by an electric spark plug.
|Diesel is used as fuel.
|Petrol is used as fuel.
|The ratio of air to fuel is not fixed.
|The ratio of air to fuel is usually constant and is 15:1.
|Combustion does not require electricity or electrical sparking.
|Combustion requires electricity or electrical sparking.
|Compression ratio from 14:1 to 20:1.
|Compression ratio from 4:1 to 8:1.
|Compression pressure 40 to 45 kg/sq cm.
|Compression pressure 7 to 10 kgsqcm.
|The heat of contraction is about 600°C (red hot).
|The heat of contraction is 200°C to 300°C.
|Thermal efficiency is 32-38%.
|Thermal efficiency 25-32%.
|Ignition pressure 50 to 60 kg/sq cm.
|The ignition pressure is about 20 kg/sq cm.
|This engine runs on a diesel cycle.
|This engine runs on an auto cycle.
|This is a constant pressure cycle.
|This is a fixed volume cycle.
|Only air enters the cylinder during suction.
|Air and fuel mixture enter the cylinder during suction.
|Diesel is sprayed by a high-pressure pump injector at the end of the compression stroke to affect combustion.
|Battery requires an ignition coil, CB point, distributor and spark plug, etc to perform combustion.
|High-pressure pumps and injectors are essential for the fuel system.
|AC pump and carburetor are very important for fuel systems.
|This engine uses relatively low-quality oil.
|High-quality oil is used in this engine.
|This engine has more performance.
|This engine has low performance.
|This engine has a short lifespan.
|This engine has a long life.
|Relatively low RPM is available.
|Maximum RPM is available.
|Heavier in weight, for parity.
|Lighter in weight, for equal strength.