Abstract: A lubrication mechanism for an engine cylinder includes upper and lower ring troughs on the inside wall of the engine cylinder. The two ring troughs can accommodate oil pipes and ring oil nets. The oil pipes include an inlet pipe and an outlet pipe. Channels and numerous oil pores are defined by the pipes to allow the entrance of lubricating oil into the oil pipes, and seepage from the pores on the oil pipe, through a ring oil net to provide lubrication to the inside wall of the cylinder. The lubricating oil then flows downwardly to the lower ring oil net, through the net and the oil pipe, and into an outlet pipe for discharge.