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All of the following factors promote detonation in SI engines, except
- a)increase in inlet pressure and temperature of charge
- b)higher compression ratio
- c)high self ignition temperature
- d)advanced spark timing
Correct answer is option 'C'. Can you explain this answer?
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All of the following factors promote detonation in SI engines, excepta...
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All of the following factors promote detonation in SI engines, excepta...
Factors promoting detonation in SI engines
Increase in inlet pressure and temperature of charge
- Higher pressure and temperature in the intake charge result in increased energy and reactivity, which can lead to detonation.
Higher compression ratio
- A higher compression ratio results in a higher temperature and pressure in the combustion chamber, which can promote detonation.
Advanced spark timing
- Advancing the spark timing can cause the air-fuel mixture to ignite before the spark plug fires, resulting in detonation.
Exception: High self ignition temperature
- Contrary to the other factors, a high self-ignition temperature can actually prevent detonation. This is because the higher temperature required for the fuel to ignite on its own means that it is less likely to ignite prematurely and cause detonation.
Conclusion
- While factors such as increased inlet pressure and temperature, higher compression ratio, and advanced spark timing can promote detonation in SI engines, a high self-ignition temperature can actually prevent it.
Increase in inlet pressure and temperature of charge
- Higher pressure and temperature in the intake charge result in increased energy and reactivity, which can lead to detonation.
Higher compression ratio
- A higher compression ratio results in a higher temperature and pressure in the combustion chamber, which can promote detonation.
Advanced spark timing
- Advancing the spark timing can cause the air-fuel mixture to ignite before the spark plug fires, resulting in detonation.
Exception: High self ignition temperature
- Contrary to the other factors, a high self-ignition temperature can actually prevent detonation. This is because the higher temperature required for the fuel to ignite on its own means that it is less likely to ignite prematurely and cause detonation.
Conclusion
- While factors such as increased inlet pressure and temperature, higher compression ratio, and advanced spark timing can promote detonation in SI engines, a high self-ignition temperature can actually prevent it.
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All of the following factors promote detonation in SI engines, excepta)increase in inlet pressure and temperature of chargeb)higher compression ratioc)high self ignition temperatured)advanced spark timingCorrect answer is option 'C'. Can you explain this answer?
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