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Increasing oil prices and emission legislation have forced car manufacturers and suppliers to investigate new methods and technologies to improve the efficiency of current spark ignition engines. In order to follow these trends and to yield a contribution in the development of modern combustion concepts, spark plugs with improved ignition performance are required. Reliable ignition and inflammation in operating points employing stratified and lean air/fuel charge is thereby a challenging task. In this study we are using a full 3D model of the engine which is offering a possibility to conduct a virtual replacement of the spark plug. With this modeling concept we are able to investigate the influence of different spark plug designs on the ignitability of the air/fuel mixture at the ignition time.