Porsche 550 Spyder
Introduced in 1953 at the Paris Motor Show the 550 featured a two-seat, open top aluminum body wrapped over a tubular ladder chassis with a MR layout mid/rear mounted, 1.5 litre, air-cooled flat-4 engine which weighed in at just 550 kg (1213 lb).
Although 2 units were produced with a modified OHV Volkswagen engine, Porsche's "Type 547" engine (designed by Dr. Ernst Fuhrmann) was standard fare for all other 550s. The Fuhrmann unit was very advanced for its day, as it had four camshafts that were all driven via a Königswelle by the crankshaft, helping provide 110 bhp (very strong for a vehicle of such light weight). With the quad-cam engine powering it, the 550 was capable of performance very comparable to and in many cases better than Ferrari and Jaguar models with larger engines. The particularly rare 356 Carrera model was the Porsche's only standard production vehicle to feature this powerplant.
Although Porsche had raced with the 356 for several years already, the 550 was distinct in that it was the company's first purpose-built racecar. The factory successfully campaigned the 550 in international auto racing, headed by the vehicle's premier win at the 1954 24 Hours of Le Mans, where it won its class. Lake Underwood raced the 550 Spyder in the United States.
Later that year Porsche began a production run of customer cars, building 90 units in total before replacing the original 550 with the extensively reworked 550A in 1956. The 550A variant sported various improvements over the outgoing model, including a spaceframe chassis, the latest version of the Fuhrmann four-cam engine mated to a five-speed transmission, and a multi-link rear suspension setup which reduced oversteer and improved handling.