The answer is B. A only. The optimum valve timing is found through experimentation using an engine dynamometer. The timing of the opening and closing of the valves is called valve timing. So the use of dynamometer measures the power output of a machine that is why it can measure the optimum valve timing.
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upfront price, but dependent on how long you use it you will save money, also the power it provides per square inch is low but that will be solved with time.
