Abstract
In this paper, as a part of broader study related to the effect of valve/port geometry layout variations on combustion, some initial results concerning the structure and the evolution of the fluid flow pattern during induction in 4-valve engine with pentroof combustion chamber and canted valves were presented. Results were obtained by dint of multidimensional numerical modeling of non-reactive and reactive flows in arbitrary geometry. The commencement of opening and further movement of both intake valves was set to be simultaneous. Fluid flow pattern was characterized with organized tumble motion up to 140 0 .ATDC followed by small but clearly legible deterioration thereafter In order to enhance the generation of more pronounced swirl and tumble motions than those produced with both valve open, leading to higher turbulence intensities in the vicinity of TDC prior to combustion port de-activation was tackled as well but no clear benefit was observed.