The Model B was a Ford automobile produced between 1932 and 1934. It was a much updated version of the Model A and was replaced by the Model 48. Strictly speaking, the Model B was a four-cylinder car with an improved Model A engine with a displacement of 201 cu in (3.3 l) and 50 hp, but Ford also began producing a very similar car with Ford's new flathead V‑8 engine. The V‑8 car was marketed as the Model 18, though it is commonly called the Ford V‑8, and, other than the engine, is virtually indistinguishable from the Model B. A coupé or coupe (from the French past participle coupé, of the infinitive couper, to cut) commonly understood to have a fixed roof and two doors. However several four-door vehicles, including the Mercedes-Benz CLS and Rover P5 Coupé, are claimed by their manufacturers to be "coupes". Drag racing is a competition in which specially prepared automobiles or motorcycles compete, usually two at a time, to be first to cross a set finish line. The race follows a straight course from a standing start over a measured distance, most commonly ¼ mile (1,320 ft (400 m)) for most cars, with a shorter 1,000 ft (300 m) for some Top Fuel dragsters and funny cars. Electronic timing and speed sensing systems have been used to record race results since the 1960s.