What tool is used to resize engine cylinders?

The tool used to resize engine cylinders is a hone, which is specifically designed for finishing the interior surface of a cylinder. Hones operate with a rotating abrasive stone that can precisely remove material from the cylinder walls to achieve the desired diameter and surface finish. This process is crucial after machining or when preparing the cylinder for new piston rings, as it helps create a proper fit and enhances the engine's performance.

In the context of engine maintenance, honing creates cross-hatch patterns on the cylinder walls, which aid in oil retention and improve piston ring sealing. The control and precision needed for resizing make a hone the right choice for this specific task.

Other tools mentioned serve different purposes: a lathe is primarily used for shaping cylindrical parts, a file is used for smoothing or shaping material on a smaller scale, and a drill is used for creating holes. None of these tools possess the specific capability required for the resizing and finishing process of engine cylinders that a hone provides.