|Manufacturer||Bayerische Motoren Werke AG (BMW)|
|Production||May 1956 – March 1959 
|Designer||Albrecht von Goertz|
|Body and chassis|
|Body style||2-door 2+2 seater coupe
2-door 2+2 seater cabriolet
|Engine||3,168 cc (193 cu in) BMW OHV V8|
|Wheelbase||2,835 mm (111.6 in)|
|Length||4,750 mm (187 in)|
|Width||1,710 mm (67 in)|
|Height||1,440 mm (57 in)|
|Curb weight||1,500 kg (3,300 lb) approximately|
|Successor||BMW 3200 CS|
The BMW 503 is a two door 2+2 grand touring automobile from the 1950s. BMW developed the 503 alongside their 507 roadster in an attempt to sell a significant number of luxury cars in the United States. The 503 and 507 cost about twice their projected price and did not recover their costs. During production from May 1956 to March 1959, 412 units of the 503 were built.
Concept and design
Hanns Grewenig, sales manager of BMW, repeatedly requested the development of a sports car based on their 501 and 502 luxury sedans. In early 1954, influenced by the public reaction to Mercedes-Benz 300SL and 190SL show cars in New York in February 1954, the management of BMW approved the project.
Max Hoffman, an influential automobile importer in the United States, saw early design sketches by BMW's Ernst Loof, and suggested to industrial designer Albrecht von Goertz that he should submit design proposals to BMW. Based on these proposals, BMW contracted Goertz to design the 503 and 507 in November 1954.
The 503 was a 2+2 grand tourer that was available as either a coupe or a convertible. It was noted for having a cleaner and more modern design than the "Baroque Angel" 501-based sedans. The convertible version of the 503 was the first European convertible with an electrically operated top.
Engineering and development
Tasked with designing rolling chassis for two cars while using as much as possible from the existing 502 sedan, engineer Fritz Fiedler designed two versions of a new ladder frame, one with the same wheelbase as the 502, and one with a shortened wheelbase. The long-wheelbase version was used in the 503. Both cars used the steering system and a variant of the front suspension system from the 502; the 503 also used the 502's rear suspension. As originally designed, the 503 used the 502's remote gearbox placement and shift linkage. Both cars used the braking system developed for the 3.2 sedan, using drum brakes with vacuum assist. All 503s were configured for left hand drive.
Both cars used the 3.2 L version of the 502's V8 engine developed for the 3.2 sedan, but with two carburetors and with an improved lubrication system using a chain-driven oil pump. The 503's V8 had a compression ratio of 7.5:1 and yielded 140 bhp (100 kW; 140 PS) at 4800 rpm.
The 503 had sixteen inch wheels and standard final drive ratio of 3.90:1, A final drive ratio of 3.42:1 was optional. Acceleration of the 503 from standstill to 100 km/h (62 mph) had been measured at 13 seconds; the top speed of the 503 is about 115 miles per hour (185 km/h).
Hoffman had wanted BMW's sports and GT cars to be positioned between Triumph's sports cars and the Mercedes-Benz 300SL, at a selling price close to US$5000. He told BMW he would order thousands of their sports cars at a purchase price of DM12,000. After introduction at the Frankfurt Motor Show in September 1955, the 503 began production in May 1956 with a selling price of DM29,500, while the 507 roadster sold for DM26,500 when it began production seven months later.
Despite Battista "Pinin" Farina's opinion that the 503 was superior in design to the 507, the 503 was largely overshadowed by the 507. However, while neither the 503 nor the 507 sold well enough to earn a profit, the larger, heavier, plainer, more expensive 503 sold 412 units to the 507 roadster's 253. 139 of the 507s made were convertibles. Production ended in March 1959.
- Norbye, Jan P., BMW - Bavaria's Driving Machines, p.115
- Norbye, p.96
- Norbye, p.113
- Car Body Design: BMW 507 and 503 (1955-1960)
- Norbye, p.116
- Norbye, p. 95
- Norbye, pp. 95-96
- Norbye, pp. 113-114
- Buckley, Martin, BMW Cars, p. 40
- Norbye, pp. 114-115
- Noakes, Andrew, The Ultimate History of BMW, pp. 49-50
- Lewin, Tony, The Complete Book of BMW: Every Model since 1950, pp. 28-29
- Buckley, p. 41
- Noakes, p. 52
- Norbye, p. 130
- Lewin, pp. 29-31
- Norbye, p. 251
- Langworth, Richard M., Complete Book of Collectible Cars: 70 Years of Blue Chip Auto Investments 1930-2000, p. 49
- Noakes, pp. 63, 65
- Norbye, pp. 131-132
- Books and journals
- Buckley, Martin (2001) . BMW Cars. St. Paul, MN USA: MotorBooks International. Coupe Elegance–The Forgotten 503, pp. 40-41. ISBN 0-7603-0921-3. Retrieved 2013-12-09.
- Langworth, Richard M. (2000). Complete Book of Collectible Cars: 70 Years of Blue Chip Auto Investments 1930-2000. Publications International. p. 49. ISBN 0-7853-4313-X. Retrieved 2013-12-09.
- Lewin, Tony (2004). "Faded glory". The Complete Book of BMW: Every Model since 1962. St. Paul, MN USA: Motorbooks International. pp. 23–37. ISBN 0-7603-1951-0. Retrieved 2013-12-08.
- Noakes, Andrew (2005). The Ultimate History of BMW. Bath, UK: Parragon Publishing. ISBN 1-4054-5316-8.
- Norbye, Jan P. (1984). "Postwar Panache: Baroque Angels, Timeless Sports Cars". BMW - Bavaria's Driving Machines. Skokie, IL, USA: Publications International. ISBN 0-517-42464-9. LCCN 84-60309.
- Web sites
- Albrecht von Goertz (21 November 2006). "BMW 507 and 503 (1955-1960)". Car Body Design. Rome, Italy: FTM Studio. Retrieved 23 June 2010.
- This article incorporates information from the revision as of 2008-02-08 of the equivalent article on the Italian Wikipedia.
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|Microcar||Isetta 250 / 300|
|Small family car||600||LS/700|
|Compact exec||3 Series||1602/2002||E21||E30|
|6 Series||327*||503||3200 CS||2000C, 2000CS||E9||E24|
|Sports car/GT||M1, 8 Series||E26||E31|
|*made in East Germany as EMW|