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, the pressure generated and constant parameters during the 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 a low thermal efficiency | CI engines have high thermal efficiency. |
| 3 | Fuel used | Petrol is used as fuel, which has a high self-ignition temperature. | Diesel is used as fuel, it has a 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 the otto cycle. | CI engine works on diesel cycle. |
| 6 | Pressure generated | A homogeneous mixture of fuel, hence high pressure is generated. | A heterogeneous mixture of fuel, hence low pressure is generated. |
| 7 | Constant parameter during cycle | Constant volume cycle. | Constant pressure cycle. |
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