Spark ignition engines and compression ignition engines are the two most popular types of engines. We can differentiate between these two based on various factors such as engine speed, cycle efficiency, fuel used, time of knocking, cycle operation, the pressure generated, and constant parameter during the cycle.
Check out the below table to know the differences between Spark ignition engines (SI Engine) and compression ignition engines (CI Engine).
| S.no | Spark Ignition Engine | Compression-Ignition Engine |
|---|---|---|
| 1 | SI engines are high-speed engines. | CI engines are low-speed engines. |
| 2 | SI engines have a low thermal efficiency | CI engines have high thermal efficiency. |
| 3 | 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 | Knocking takes place at the end of combustion. | Knocking takes place at the beginning of combustion. |
| 5 | SI engine works on the otto cycle. | CI engine works on the diesel cycle. |
| 6 | The homogeneous mixture of fuel, hence high pressure is generated. | A heterogeneous mixture of fuel, hence low pressure is generated. |
| 7 | Constant volume cycle. | Constant pressure cycle. |
Closing Thought
The Spark-ignition engine is an internal combustion engine of fuel and air that is ignited with flash attachments, intended to chip away at gas and comparative oil-based goods. This sort of motor contrasts from the diesel (Ci) motor by the method of the burning of fuel and air, and by the way that the start is utilized by the electric evaporator rather than the air pressure, which is warmed at high temperature. With a Si motor, it is normal to have fuel and air between pre-pressure, albeit in present-day petroleum motors the rule of direct fuel infusion in the chamber is utilized, which is basically the same as the rule of a diesel motor.