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The internal combustion engine flow field has direct influence on the engine performance regarding both power and emissions. The intensity, location and direction of the flow structures known as tumble, cross tumble and swirl are key parameters on design and development of combustion chamber, especially on the spark plug position. This paper presents a Computational Fluid Dynamics (CFD) analysis on the flow field structures inside a two valve engine through the late compression stroke using commercial three dimensional software. The magnitude of the velocity vector has been plotted as a scalar in a contour map, so the center of the vortex is represented by the zero velocity region. Special attention is given to the spark timing, for it's the most important instant for determining the center of the swirl vortex. This is because the zero velocity region is considered the best place for the spark plug position, from the fluid dynamic point of view.