An internal combustion engine comprises a rotating connector engaged rotatably in the rotatable receptacle. The rotating connector includes two rotational axles, two radial arms extending from the rotational axles, and an off-center middle axle connected to the two radial arms, and the two rotational axles share a common axis and are parallel to the off-center middle axle. The upper end is rotatably connected to the off-center middle axle of the rotating connector and the lower end is rotatably connected to the crankshaft. The internal combustion engine goes through an engine cycle comprising an intake phase, a compression phase, a expansion phase, and a exhaust phase. During the intake and compression phases the piston travels between a top dead center and a first bottom dead center. During the compression and exhaust phases the piston travels between a second bottom dead center to the top dead center.