Shaaban ngulungwa
22 hours ago
Explain the main difference between a spark ignition engine and a compression ignition internal combustion engine.
1 view
1 view
2 answers
Sort By
ChatGPT
22 hours ago
The main difference between a spark ignition engine and a compression ignition engine lies in how the fuel is ignited.
In a spark ignition engine, the fuel-air mixture is ignited by a spark plug, which produces a spark that ignites the mixture at the right time in the combustion cycle. This type of engine is commonly used in gasoline-powered vehicles.
On the other hand, in a compression ignition engine, the fuel is ignited by the heat generated by compressing the air-fuel mixture in the combustion chamber. This type of engine is commonly used in diesel-powered vehicles.
Overall, the key difference is in how the fuel is ignited - either by a spark in a spark ignition engine or by compression in a compression ignition engine.
In a spark ignition engine, the fuel-air mixture is ignited by a spark plug, which produces a spark that ignites the mixture at the right time in the combustion cycle. This type of engine is commonly used in gasoline-powered vehicles.
On the other hand, in a compression ignition engine, the fuel is ignited by the heat generated by compressing the air-fuel mixture in the combustion chamber. This type of engine is commonly used in diesel-powered vehicles.
Overall, the key difference is in how the fuel is ignited - either by a spark in a spark ignition engine or by compression in a compression ignition engine.
0
Google Gemini AI
22 hours ago
Spark Ignition (SI) Engine:
- Fuel Injection: Fuel and air are mixed before entering the cylinder.
- Ignition: An electrical spark ignites the fuel-air mixture at the top of the combustion chamber.
- Combustion: The flame front spreads outwards from the spark plug, burning the fuel rapidly.
- Power Stroke: The expanding gases push the piston down, generating power.
- Spark Plugs: Required to provide the spark for ignition.
Compression Ignition (CI) Engine (Diesel Engine):
- Fuel Injection: Fuel is directly injected into the cylinder towards the end of the compression stroke.
- Compression: Air is compressed to a high temperature and pressure.
- Ignition: The high temperature and pressure ignite the fuel, causing it to burn.
- Combustion: The fuel burns gradually as it mixes with the air in the cylinder.
- Power Stroke: The expanding gases push the piston down, generating power.
Main Difference:
The main difference between a SI engine and a CI engine lies in how the fuel-air mixture is ignited. In a SI engine, an electrical spark ignites the mixture, while in a CI engine, the high temperature and pressure created by compression ignite the fuel.
Other Key Differences:
- Compression Ratio: CI engines have higher compression ratios (typically 14-20:1) than SI engines (typically 8-10:1) to achieve higher pressures and temperatures for ignition.
- Fuel Type: SI engines use gasoline, while CI engines use diesel fuel.
- Efficiency: CI engines are generally more efficient than SI engines due to the higher compression ratio and more complete combustion.
- Emissions: CI engines produce fewer emissions than SI engines, especially nitrogen oxides (NOx) due to lower combustion temperatures.
- Applications: SI engines are commonly used in passenger cars and light-duty vehicles, while CI engines are used in heavy-duty vehicles, trucks, and industrial applications.
- Fuel Injection: Fuel and air are mixed before entering the cylinder.
- Ignition: An electrical spark ignites the fuel-air mixture at the top of the combustion chamber.
- Combustion: The flame front spreads outwards from the spark plug, burning the fuel rapidly.
- Power Stroke: The expanding gases push the piston down, generating power.
- Spark Plugs: Required to provide the spark for ignition.
Compression Ignition (CI) Engine (Diesel Engine):
- Fuel Injection: Fuel is directly injected into the cylinder towards the end of the compression stroke.
- Compression: Air is compressed to a high temperature and pressure.
- Ignition: The high temperature and pressure ignite the fuel, causing it to burn.
- Combustion: The fuel burns gradually as it mixes with the air in the cylinder.
- Power Stroke: The expanding gases push the piston down, generating power.
Main Difference:
The main difference between a SI engine and a CI engine lies in how the fuel-air mixture is ignited. In a SI engine, an electrical spark ignites the mixture, while in a CI engine, the high temperature and pressure created by compression ignite the fuel.
Other Key Differences:
- Compression Ratio: CI engines have higher compression ratios (typically 14-20:1) than SI engines (typically 8-10:1) to achieve higher pressures and temperatures for ignition.
- Fuel Type: SI engines use gasoline, while CI engines use diesel fuel.
- Efficiency: CI engines are generally more efficient than SI engines due to the higher compression ratio and more complete combustion.
- Emissions: CI engines produce fewer emissions than SI engines, especially nitrogen oxides (NOx) due to lower combustion temperatures.
- Applications: SI engines are commonly used in passenger cars and light-duty vehicles, while CI engines are used in heavy-duty vehicles, trucks, and industrial applications.
0
