Internal Combustion Engines
The increase of efficiency of a compression ignition engine, as the load decreases, is due to

Higher maximum temperature
Quantitative governing
Hit and miss governing
Qualitative governing

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

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

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