Comparison or Difference Between S I and C I Engines - Introduction of Internal Combustion Engines | Summary and Q&A

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April 11, 2022
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Comparison or Difference Between S I and C I Engines - Introduction of Internal Combustion Engines

TL;DR

SI engines are based on the Otto cycle and use petrol as fuel with high ignition temperature, while CI engines are based on the Diesel cycle and use diesel as fuel with low ignition temperature.

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Key Insights

  • 😒 SI engines work on the Otto cycle and use petrol, while CI engines work on the Diesel cycle and use diesel.
  • 🚒 SI engines require a spark plug for ignition, while CI engines use injectors.
  • 🚒 The compression ratio is lower in SI engines and higher in CI engines.
  • 😘 SI engines have lower efficiency due to their lower compression ratio.
  • 🚒 SI engines are lighter in weight, while CI engines are heavier.
  • ⚡ SI engines have higher maximum RPM due to their lighter weight.
  • ⛽ SI engines require a carburetor for fuel mixture, while CI engines use a fuel pump and injectors.

Transcript

dear friends today we are going to understand very important concept in this that is the basic difference between the esi that is spark ignition and ca that is compression ignition engine in the last few lectures we already discussed about the spark ignition engine and the compression ignition engine we already discussed all the details about it so... Read More

Questions & Answers

Q: What is the difference between SI and CI engines?

The main difference is that SI engines use petrol and work on the Otto cycle, while CI engines use diesel and work on the Diesel cycle. SI engines have a spark plug for ignition, while CI engines have injectors.

Q: Why do SI engines have lower efficiency compared to CI engines?

SI engines have a lower compression ratio, which leads to lower efficiency. The lower compression ratio in SI engines reduces the thermal efficiency of the combustion process.

Q: Why are SI engines lighter in weight compared to CI engines?

SI engines have a lower compression ratio and do not require as strong of engine components to withstand the higher pressures produced in CI engines. This results in SI engines being lighter.

Q: Why do SI engines have higher maximum RPM compared to CI engines?

SI engines have lighter components due to their lower compression ratio, allowing them to achieve higher RPMs. The lighter components can rotate faster, resulting in a higher maximum RPM.

Summary & Key Takeaways

  • SI engines work on the Otto cycle and use petrol as fuel, while CI engines work on the Diesel cycle and use diesel as fuel.

  • SI engines require an ignition system with a spark plug, while CI engines replace the spark plug with injectors.

  • The compression ratio for SI engines ranges from 6 to 10.5, while for CI engines, it is higher, ranging from 14 to 22.

  • SI engines have lower efficiency due to their lower compression ratio, while CI engines have higher efficiency.

  • SI engines are lighter in weight, while CI engines are heavier.

  • SI engines have higher maximum revolutions per minute (RPM) due to their lighter weight.

  • SI engines require a carburetor for providing the fuel mixture, while CI engines use a fuel pump to pressurize the fuel and send it to the injectors.

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