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In an SI engine very high compression ratio cannot be used because
  • a)
    the engine efficiency would be unmanageably high
  • b)
    the power required for compression would be high
  • c)
    cylinders will require very thick walls
  • d)
    self-ignition may take place before the spark occur
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
In an SI engine very high compression ratio cannot be used becausea)th...
By increasing the compression ratio, temperature and pressure of the end charge increases. Increase in temperature reduces the delay of the end charge which increases the knocking tendency of SI engine.
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In an SI engine very high compression ratio cannot be used becausea)the engine efficiency would be unmanageably highb)the power required for compression would be highc)cylinders will require very thick wallsd)self-ignition may take place before the spark occurCorrect answer is option 'D'. Can you explain this answer?
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