refers to the maximum power speed of the engine maximum power output, corresponding to the rotational speed.
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with the power output of the engine speed relationship great as the speed increases, the power of the engine is correspondingly increased, but to a certain speed after power but declined. Thus, corresponding to the engine maximum power speed at maximum power speed referred to. General instructions for use in the car speed units with r / min expressed as maximum power 100Ps / 5000r / min, i.e., at 5000 revolutions per minute maximum output 100Ps.
When the rotational speed of the engine passenger car or truck is higher than the maximum power, in order to adapt its high-speed travel needs. Usually the maximum power speed models are about 5000-8000 r / min, the maximum engine power be lower, probably between 3000-5000 r / min.