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Spark Ignition (SI) engine can be compared with Compression Ignition (CI) engine system in 7 aspects. Those 7 aspects are engine speed, cycle efficiency, fuel used, time of knocking, cycle operation, pressure generated and constant parameter during cycle.

S.no

Aspect

Spark Ignition Engine

Compression Ignition Engine

1

Engine speed

SI engines are high speed engines.

CI engines are low speed engines.

2

Cycle efficiency

SI engines have low thermal efficiency

CI engines have high thermal efficiency.

    

3

Fuel used

Petrol is used as fuel, which has high self ignition temperature.

Diesel is used as fuel, it has low self ignition temperature.

4

Time of knocking

Knocking takes place at the end of combustion.

Knocking takes place at the beginning of combustion.

5

Cycle operation

SI engine works on otto cycle.

CI engine works on diesel cycle.

6

Pressure generated

Homogeneous mixture of fuel, hence high pressure is generated.

Heterogeneous mixture of fuel, hence low pressure is generated.

7

Constant parameter during cycle

Constant volume cycle.

Constant pressure cycle.

 

 

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