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Overall efficiency is the ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time while mechanical efficiency is the ratio of the brake power to the indicated power and relative efficiency is the ratio of the indicated thermal efficiency to the air standard efficiency.

Relative efficiency is the ratio of the indicated thermal efficiency to the air standard efficiency whereas overall efficiency is the ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time and mechanical efficiency is the ratio of the brake power to the indicated power.

By increasing the pressure of intake air, the brake power of a diesel engine, keeping other parameters constant, can be increased and by no other means.

Brake power is defined as the power developed by an engine at the output shaft while indicated power is defined as the total power developed by combustion of fuel in the combustion chamber and mean effective pressure is defined as the hypothetical pressure which is thought to be acting on the piston throughout the power stroke.

Mean effective pressure is defined as the hypothetical pressure which is thought to be acting on the piston throughout the power stroke and brake power is defined as the power developed by an engine at the output shaft while indicated power is defined as the total power developed by combustion of fuel in the combustion chamber.

Detonation can be controlled by retarding the spark timing.
Engine detonation refers to spontaneous combustion of the remaining fuel/air mixture in the chamber after normal spark-initiated combustion.
Detonation occurs when excessive heat and pressure in the combustion chamber causes the air/fuel mixture to ignite on its own.

The firing order of a six stroke I.C. engine is 1-5-3-6-2-4 .

Sulphur content in diesel engine oil should not be more than 1%.

The ash content in diesel oil should be not be more than 0.01% while sulphur content in diesel engine oil should not be more than 1%.

Indicated power is defined as the total power developed by combustion of fuel in the combustion chamber.
While brake power is defined as the power developed by an engine at the output shaft and mean effective pressure is defined as the hypothetical pressure.
It is thought to be acting on the piston throughout the power stroke.

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