Internal Combustion Engines
Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads

The engine is rarely operated
The friction is high
The friction is unpredictable
The small difference in cooling water temperature or in internal friction has a disproportionate effect

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

Starts at 40° after bottom dead center and ends at 10° before top dead center
May start and end anywhere
Starts at 40° before top dead center and ends at 40° after top dead center
Starts at top dead center and ends at 40° before bottom dead center

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