The slider-crank in engine is one of the important mechanisms in automobiles w hich transports force and displacement. The flexible deformation of the crank and the connecting rod w ill affect the dynamic performance of the engine. The flexible dynamic model of the engine slider-crank is established base on the absolute nodal coordinate formulation( ANCF). The influence of the flexible deformation on the displacement of the piston is studied. The equation w hich is used to calculate the engine compression r...