What is the full form of SI engine?

A spark-ignition engine (SI engine) is an internal combustion engine, generally a petrol engine, where the combustion process of the air-fuel mixture is ignited by a spark from a spark plug.

What is the difference between SI and CI?

Simple interest is generally based on the principal amount of a loan or deposit whereas compound interest is based on the principal amount and also on the interest that accumulates on the principal every period. We have already discussed this in the SI vs CI definition.

Which is better SI engine or CI engine?

Thermal efficiency: Due to lower compression ratio, maximum value of thermal efficiency is lower in an S.I engine compared to that of C.I. 7… Weight : S.I engines are generally lighter in weight due to their lower peak pressures as compare to C.I engines that are generally heavier, due to higher peak pressure.

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.

Explanation: Carburetor is not related to compression ignition engine. … Explanation: The purpose of carburetion is to break up and mix the petrol with air.

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What are the main characteristics of SI engine fuel?


  • It should readily mix with air to make a uniform mixture at inlet, ie. …
  • It must be knock resistant.
  • It should not pre-ignite easily.
  • It should not tend to decrease the volumetric efficiency of the engine.
  • It should not form gum and varnish.

Which is the most preferred SI engine fuel?

engines fuel most preferred are paraffins and for S.I. engines fuel most preferred are aromatics.

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