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1. The bore for SI engine at 1200 rpm is 10.2 cm, and the disposition of...

1. The bore for SI engine at 1200 rpm is 10.2 cm, and the disposition of spark plug is 6mm from the center. The spark plug ignites at BTDC 20° . After the combustion develops and becomes Flame Propagation form with average flame velocity 15.8m/sec, the angle of engine rotation is 6.5° .

a) after the flame develops, how much time does it take for combustion process (time for flame front to reach the farthest combustion chamber wall)

b) the crank angle at the end of combustion

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