CAE (Computer Aided Engineering) and associated softwares have become an essential element in the process of design, simulation, manufacturing and even marketing in automotive industry as well as in other major manufacturing companies. Multiphysics simulation of IC engines may be one of the most challenging topics technically and scientifically, since it involves sound basis with diverse physical phenomena and numerical methods with in-depth understanding and experience of engineering problems. There are quite a few commercial softwares currently available for various CAE elements, i. e. CAD (Computer Aided Drafting), FEA (Finite Element Analysis), CFD (Computational Fluid Dynamics), multibody dynamics, optimization, pre- and post-processing, which require substantial investment cost for licencing, personnel and computing facilities. There is a current consensus for the need of a low cost CAE option based open sources through which many professionals may participate and contribute to new physical modeling features and validation through manty test cases through a web-based open source platform allowing free access to anyone interested. There are several high quality open source programs available under GPL which allow development and free use. Some of them have features as competitive as most commercial softwares in their physical models and validation cases, whereas their graphic user interface in general may not be as convenient and user-friendly as the commercials. In this work we have developed a web-based platform with selected open source programs, FreeCAD for CAD, Code_Aster for FEA, OpenFOAM for Multiphysics CFD, MBDyn for multibody dynamics, Dakota for optimization together with Salome, cfMesh and snappyhexmesh for preprocessing and paraview for postprocessing. All open source programs are downloadable, while remote job access can be performed with minimal charges for use of the cloud computing hardware. We tried to provide proper data interfaces among these softwares and graphic user interface based on Helyx-OS. While it is possible to ftp the result files any time to a remote computer, Paraviewweb is implemented to allow faster response for rendering 3D graphics in pre and postprocessing with the programs running on the server. Although the web site is currently under development through funding by KOSEF (Korea Science and Engineering Foundation), the performance of the platform will be shown for some example cases of in-cylinder flow and combustion, vehicle external flow, water jacket flow in the coolant channel flow and stress analysis in an engine block.