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In this paper some results concerning the structure and evolution of fluid  flow pattern during induction and compression in 4.- valve engines with  tilted valves were presented. Results were obtained by dint of  multidimensional modeling of non-reactive flows in arbitrary geometry with  moving boundaries. During induction fluid flow pattern was characterized with  organized tumble motion followed by small but clearly legible deterioration  in the vicinity of BDC. During compression the fluid flow pattern is entirely  three-dimensional and fully controlled by vortex motion located in the  central part of the chamber. In order to annihilate negative effects of  tumble deterioration and to enhance swirling motion one of the intake valves  was deactivated. Some positive and negative effects of such attempt were  elucidated. The effect of turbulence model alteration in the case of  excessive macro flows was tackled as well. Namely, some results obtained with  eddy-viscosity model i.e. standard k-ε model were compared with results  obtained with k-ξ-f model of turbulence in domain of 4.-valve engine  in-cylinder flow. Some interesting results emerged rendering impetus for  further quest in the near future

Some subtleties concerning fluid flow and turbulence modeling in 4.-valve engines