Abstract
In this paper some results concerning the effect of intake flow modeling obtained by 3D numerical modeling of combustion on flame front shape and its displacement through combustion chamber geometry of s.i.engine consisting of of flat head with two vertical valves and cylindrical bowl were presented. These results were compared with results of flame front shape and its displacement obtained for the case without valves i.e. without intake flow modeling. No initial swirl velocity profile was implied for both cases. It was found that for particular combustion chamber shape considered the entirely different flame front shapes and propagation velocities were encountered for these two cases ensuing primarily from the entirely different fluid flow patterns in the vicinity of TDC