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In recent years, the design and development of combustion engines have been revolutionized by the use of computer simulation tools. These tools allow rapid dissemination of information about critical systems during the concept design phase, and also allow a high level of optimization within the total engine design process. The extended cooperation between manu-facturer and external engineering partner creates the necessity of a common access to the simulation tools for both parties. At FEV several simulation programs have been developed [1, 2] that are used by specialists who are familiar with the specific program. Due to the frequent use of these tools in various projects [3, 4] their database is always up to date, they are continuously improved and the results are verified by measurements. The simulation models for the dynamic calculations of valve train, as well as valve train drive systems, have been transferred to a commercially available multi-body-dynamic simulation software.