A flywheel assembly, including a cylinder including a first end and a second end, a first piston non-rotatably connected to the cylinder, the first piston being slidably engaged in the cylinder proximate the first end, a first biasing element operatively arranged in the cylinder to bias the first piston in a first axial direction, a first arm non-rotatably connected to the first piston, a second arm non-rotatably connected to the first piston, a first mass connected to the first arm, and a second mass connected to the second arm.