Question: Why diesel engines are called CI engines?

Why petrol engines and diesel engines are called as SI and CI engines respectively?

in S.I engines,ignition process is carried out with the help of a spark plug which ignites a mixture of air and fuel that is compressed in the combustion chamber. Whereas,a diesel engine also known as Compression Ignition (C.I) engine works on the basis of Diesel cycle or Constant pressure heat addition cycle.

Which is not use in CI engine?

Explanation: Methanol is not used in CI engines because of its high octane number and low cetane number. Pure methanol and gasoline in various percentages have been extensively tested in engines and vehicles for a number of years.

What can go wrong with a diesel engine?

These are eight of the most common diesel problems:

  • Difficult start. As a diesel owner, you know that they may crank a bit when started. …
  • Lack of power. …
  • Contaminated fuel. …
  • Faulty lead/acid storage battery. …
  • Black exhaust. …
  • Oil oxidation. …
  • Incorrect weight viscosity. …
  • An overabundance of noise.

Which engine is more efficient CI or SI?

CI engines have higher Thermodynamic Efficiency

With a higher compression ratio in CI engines as compared to SI engines, CI engines have a higher thermodynamic efficiency since more work is done with each expansion stroke.

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How does CI engine works?

The compression ignition engine operating on liquid fuels, or in the dual-fuel mode, works on the principle of fuel being injected into a charge of compressed air and spontaneously ignited by the high temperature of the induced air by the heat of compression.

Which is the most preferred SI engine fuel?

For SI engines the aromatics are the best fuel and the paraffins are least desirable. The reason for this is normal paraffins exhibit the poorest antiknock quality when used in SI engines.

Why SI engines are high speed engines?

SI Engines operates at higher speed due to their less compression ratio (i.e. less weight per unit power). They produce less torque and operates at higher speed.