 The same company can also supply somewhat larger engines for use in military drones, portable generators and equipment such as lawn mowers.These are "multi fuel" insofar as they can be configured to run on gasoline, kerosene, including aircraft fuels, and diesel oil.Owing to the impossibility to use conventional poppet valves in opposed-piston engines, American company Pinnacle Engines also promotes a sleeve-valve layout in its 4-stroke opposed-piston engine developments.