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

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

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Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engines

Exhaust valve opens just after bottom dead center and closes just before top dead center
May open and close anywhere
Exhaust valve opens at 35° before bottom dead center and closes at 20° after top dead center
Exhaust valve opens at bottom dead center and closes at top dead center

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