Difference Between SI (Spark Ignition) and CI (Compression Ignition) Engine, PDF

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Difference Between SI and CI Engine:

SI Engine:

The engine where fuel is ignited by a spark.

CI Engine:

The engine where the rise in temperature and pressure during compression is sufficient to cause spontaneous ignition of the fuel.

 

Difference Between SI and CI Engine

Difference Between SI and CI Engine:

Sl NoSI EngineCI Engine
1.It works on OTTO Cycle or constant volume heat addition.It works on DIESEL Cycle or constant pressure heat addition.
2.During the intake or suction process, air and fuel are used.During the intake or suction process, only air used.
3.The fuel used Petrol which is highly volatile. Self Ignition temperature is high.The fuel used Diesel which is low volatile. Self-ignition temperature is low.
4.The fuel is supplied by CarburetorThe fuel is supplied by Injector
5.High speed because due to lightweight and homogeneous combustion.Comparatively low speed because due to heavyweight and heterogeneous combustion.
6.Small VehiclesHeavy Vehicles.
7.The compression ratio is 6 to 10. The upper limit is fixed by the antiknock quality of the fuel.The compression ratio is 16 to 20. The upper limit is limited by the weight increase of the engine
8.The stating of this engine is easy.Starting is little difficult comparatively SI engine.

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Sl NoSI EngineCI Engine
9.Due to lower peak pressure, this is having lighter weight.Due to higher peak pressure, this is having a Heavier weight.
10.Maintenance cost is low.Maintenance cost is high.
11.Engine cost is less.Engine cost is high.
12.Less Vibration problem here butIn this high vibration problem.
13.Less production of hydrocarbon butIn this high production of hydrocarbon.
14.Less noise producesIt produces high noise.
15.Lowe thermal Efficiency because of low compression ratio.High thermal efficiency because of the high compression ratio.

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