Testing of IC Engines

Testing of IC Engines - why is it done? The purpose of testing an internal combustion engine (IC Engine) are

(a) To determine the information which cannot be obtained by calculations.

(b) To conform the data used in design, the validity of which is doubtful.

(c) To satisfy the customer regarding the performance of the engine.

An internal combustion engine (IC Engine) is put to thermodynamic tests, so as to determine efficiency and performance indicators.