Internal Combustion Engines
A fuel of cetane number 40 has the same ignition quality as a mixture of

40% cetane and 60% alpha methyl naphthalene
40% petrol and 60% diesel
40% alpha methyl naphthalene and 60% cetane
40% diesel and 60% petrol

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Internal Combustion Engines
In a four stroke cycle diesel engine, the inlet valve

May open and close anywhere
Opens at top dead center and closes at bottom dead center
Opens at 20° before top dead center and closes at 40° after bottom dead center
Opens at 20° after top dead center and closes at 20° before bottom dead center

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