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

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

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

Opens at 15° before top dead center and closes at 20° after top dead center
Opens at top dead center and closes at bottom dead center
May open and close anywhere
Opens at 15° after top dead center and closes at 20° before bottom dead center

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