An apparatus for making graphene for industry and research includes a modified, direct injection diesel engine having one or more cylinders and pistons, intake and exhaust valves; a system for delivering a controlled blend of acetylene and oxygen gas, coupled to the engine intake manifold; and a system for collecting graphene, coupled to the engine's exhaust manifold. The top of each piston is substantially, flat, except for a small divot, and the engine's fuel injector(s) are replaced by spark plugs, with the tip of each spark plug protruding slightly into the combustion chamber, opposite the divot. Separate electric servo motors are attached to the camshaft(s) and crankshaft, and electronically coupled to a computer or other CPU, allowing automated control of engine piston(s), valves, and other components, and automated production of graphene. A method of making graphene using the apparatus is also described.