Internal Combustion Engines
The voltage required to produce a spark across the gap, between the sparking points is

2000 to 4000 volts
10,000 to 12,000 volts
4000 to 6000 volts
6000 to 10,000 volts

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

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

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