Sunday, 27 May 2018

Comparison between Petrol and Diesel Engines | Which one is better Petrol or Diesel Engine

Comparison of Petrol and Diesel Engines:

01-Petrol engines vs Diesel engines vs HCCI Engines

  • In Petrol engine, a mixture of air and petrol is drawn into the cylinder and compressed, whereas in diesel engine, air alone is compressed
  • Compression ratio in Petrol Engines (9 – 11) is quite less as compared to Compression ratio in Diesel Engines (15 – 24) which results in higher thermal efficiency and consequently about 30 to 40 percent saving in Fuel consumption in case of Diesel Engines
  • Diesel is cheaper and less volatile than Petrol, which means lesser running cost and reduced risk of fire
  • Because of relatively lesser speeds and also robust construction in case of Diesel engines, wear and tear is reduced
  • Higher combustion efficiency of Diesel engines means less Carbon Monoxide and Hydrocarbons, but NOx and particulate matter has been a problem in their case. The same, however, has been almost remedied with the help of latest techniques. Co2 emission is also less in Diesel Engines.
  • High and more stable torque over a wide speed range in case of Diesel engines. In modern common rail direct injection Diesel engines, more torque is available even at low engines speeds, than the comparable Petrol Engines
  • Only disadvantage of modern Diesel engines is the higher initial cost. Use of CRDI technique has also reduced the noise in Diesel engines, which used to be a big handicap for their automotive applications. Even governor, which used to be a necessity in Diesel engines, in no longer required due to electronic control
  • Starting aids like heater plugs are required in Diesel Engines

01-Which is better Diesel engine or Petrol engines

Firing Order:

In 4 – Cylinder Engines: 1-3-4-2  or 1-4-3-2

In 6 – Cylinder Engines: 1-5-3-6-2-4

In V- 8 Engines: 1-8-4-3-6-5-7-2

01- Engines firing order - Which is better Diesel and Petrol Engines

01- Inline-4-Cylinder-Engine-firing-Order

01-Inline_6_Cylinder_with_firing_order_1-5-3-6-2-4

01-Inline 8 cylinder engine animation

01-v8 engine animation

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BlogMech A Complete online guide for Mechanical Engineers

BlogMech A Complete online guide for Mechanical Engineers