Question

What are the various effects of surface ignition in SI engine.

Answer 1

Surface ignition may cause decreased engine power, increased heat rejection, and, in severe cases, component physical damage and ultimate failure

Answer 2

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Relative surface ignition resistance of fuels in engines could be predicted from data obtained in the laboratory: heat of combustion of the fuel, heat capacities of the fuel and its products, radiant energy of flames, ignition energies at the temperature and pressure existing in an engine at the time surface ignition occurs, extent and nature of preflame reactions at these temperatures and pressures, effect of fuel-air ratio on energy required for ignition at the temperature and pressure existing in an engine, and the relative activity of the igniting surface under the conditions existing in an engine. General experience has been that there are no short cuts. It is simpler and more satisfactory to measure surfaceignition resistance in an engine operating under the conditions of interest.