Difference Between Petrol Engine and Diesel Engine

Difference Between Petrol Engine and Diesel Engine:

Petrol Engine: Petrol or Spark Ignition Engines In petrol or spark ignition engines, the carburetor creates a mixture of petrol and air in specific proportions and the engine cylinder receives and compresses it. But the pressure of the compressed mixture is not as high as in a diesel engine.  An electric spark is generated in the compressed mixture using a spark plug.The spark ignites the mixture of petrol and air.

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:-

Serial No Diesel Engine petrol engine
1 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.
2 Fuel is injected through injectors to ignite compressed air. The compressed mixture is ignited by an electric spark plug.
3 Diesel is used as fuel. Petrol is used as fuel.
4 The ratio of air to fuel is not fixed. The ratio of air to fuel is usually constant and is 15:1.
5 Combustion does not require electricity or electrical sparking. Combustion requires electricity or electrical sparking.
6 Compression ratio from 14:1 to 20:1. Compression ratio from 4:1 to 8:1.
7 Compression pressure 40 to 45 kg/sq cm. Compression pressure 7 to 10 kgsqcm.
8 The heat of contraction is about 600°C (red hot). The heat of contraction is 200°C to 300°C.
9 Thermal efficiency is 32-38%. Thermal efficiency 25-32%.
10 Ignition pressure 50 to 60 kg/sq cm. The ignition pressure is about 20 kg/sq cm.
11 This engine runs on a diesel cycle. This engine runs on an auto cycle.
12 This is a constant pressure cycle. This is a fixed volume cycle.
13 Only air enters the cylinder during suction. Air and fuel mixture enter the cylinder during suction.
14 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.
15 High-pressure pumps and injectors are essential for the fuel system. AC pump and carburetor are very important for fuel systems.
16 This engine uses relatively low-quality oil. High-quality oil is used in this engine.
17 This engine has more performance. This engine has low performance.
18 This engine has a short lifespan. This engine has a long life.
19 Relatively low RPM is available. Maximum RPM is available.
20 Heavier in weight, for parity. Lighter in weight, for equal strength.

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