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    Add as Friendppt on Engine knocking and relevence of bio fuels

    by: Tejaswi

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    1 : A PRESENTATION ON ENGINE KNOCKING And Alternate fuels
    2 : In an engine , when the fuel remaining after normal combustion ignites explosively by high pressure and temperature produced from normal combustion ,rather than spark from spark plug , it causes knocking or detonation. What is knocking This explosive release of energy is what causes the characteristic "knocking”. It creates the characteristic metallic "pinging" Sound.
    3 : The main driver for knock is ignition timing. As the ignition is advanced - the spark is fired earlier in the engine operating cycle - the pressure and temperature during the combustion event become higher, thus making knock more likely. Happens when fuel burn ignites irregularly and prematurely Usage of fuel with low octane rating Poor design of engine and due to their own structural problem Causes of knocking
    4 : Diagramatic explanation
    5 : Under ideal conditions the common internal combustion engine burns the fuel/air mixture in the cylinder in an orderly and controlled fashion. The combustion is started by the spark plug allowing required time for the combustion process to develop peak pressure at the ideal time for maximum recovery of work from the expanding gases. NORMAL COMBUSTION
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