Internal Combustion Engines
In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the

Beginning of exhaust stroke
End of suction stroke
Beginning of suction stroke
End of exhaust stroke

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Internal Combustion Engines
The expansion of fuel in a four stroke cycle diesel engine

Starts at top dead center and ends at 30° after top dead center
Starts at 15° before top dead center and ends at 30° after top dead center
May start and end anywhere
Starts at 15° after top dead center and ends at 30° before bottom dead center

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