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Chemistry: Difference between Petrol and Diesel Engine in Tabular Form

Petrol Engine

  • It used in cars, scooters, machines, etc.
  • It is an internal combustion engine with spark ignition. It՚s also known as gasoline engine.
  • Air and fuel are generally mixed post-compression.
  • In petrol engines, air and petrol are usually mixed in a carburetor before being introduced to the cylinder.
Illustration: Petrol Engine

Diesel Engine

  • Trucks, and other heavy vehicles run on diesel engines.
  • It also an internal combustion engine that works on diesel.
  • High temperature of the air in the cylinder is due to the adiabatic compression.
  • These engines only compress the air and not the fuel.
Illustration: Diesel Engine

Difference between Petrol and Diesel Engine

Illustration: Difference between Petrol and Diesel Engine
Table Shows Difference between Petrol and Diesel engineTable Shows Difference between Petrol and Diesel Engine
Petrol EngineDiesel Engine
Engines work on the Diesel cycleWork on Otto cycle
High power productionRelatively low amounts of power are produced in Petrol engine
High compression ratioRelatively low compression ratio
Ignition is achieved with help of hot, compressed air.Fuel is ignited with an electric spark
Fuel is mixed with air inside the cylinderAir and the fuel are mixed in a carburettor
It used in heavy vehicles such as trucks and busesUsed in light vehicles such as motorcycles and cars
Low fuel consumptionHigh fuel consumption