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The engine's inevitable trend to higher output and speed has involved a lot of perplexing problems to be solved in valve gear design. Among all these problems, in modern engines, valve linkage separation has grown to be of particular interest, since the engine's great reliability at operation beyond the rated speed has come to be the first requirement. Thus valve ‘jump’ and valve ‘bounce’ are now not the valve linkage separation phenomena that might occur beyond the maximum engine speed, but those that should be expected within the speed ranges where the engines are driven with a considerable probability. This paper deals with the new simulation model, basically composed of a double mass system, which is conceived for sound reflection of such intricate valve train behaviors at the higher speed range of operation.