Internal Combustion Engines
The purpose of testing an internal combustion engine is

To determine the information, which cannot be obtained by calculations
To satisfy the customer regarding the performance of the engine
All of these
To conform the data used in design, the validity of which may be doubtful

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

Opens at bottom dead centre and closes at top dead centre
Opens at 30° before bottom dead centre and closes at 10° after top dead centre
Opens at 30° after bottom dead centre and closes at 10° before top dead centre
May open and close anywhere

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