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Discussion :: Internal Combustion Engines

  1. The knocking tendency in spark ignition engines may be decreased by

    2. A.

     Controlling the air-fuel mixture
    B.

     Controlling the ignition timing
    C.

     Controlling the exhaust temperature
    D.

     Reducing the compression ratio

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    Answer : Option D

    Explanation :

    The knocking tendency in spark ignition engines may be decreased by Reducing the compression ratio. -A lean mixture reduced the knocking tendency, allowing to operate the CFR engine at higher CCR. -The high concentration of nitrogen in the mixture increased the ignition delay time of the end gas, thus reducing the knocking tendency of the engine.

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