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Official BMW Club

Official BMW Club

Official BMW Club


BMW 503

Date of manufacture

1956 – 1960

Bodywork type(s)

Coupe and Cabriolet


Type 90⁰ V8

Capacity 3168cc

Bore x stroke 82mm x 75mm

Power 140bhp @ 4800rpm

Compression 7.3:1

Carburettors 2, Zenith Twin choke , 32 mm downdraught

Valve design Overhead, 2 per cylinder

Valve gear Central camshaft. Rockers, tappets and springs

Electrics 12 volt


Clutch Dry single disc Fichtel & Sachs H 18, 225 mm diameter

Gearbox ratios

ZF S4 – 15

( below front seats )

1st                  3.78:1

2nd                  2.35:1

3rd                  1.49:1

4th                  1.00:1


Axle ratio 3.90

Synchromesh 1st – 4th


Frame “Full protection” longitudinal box section with tubular cross beams

Suspension Front: Double wishbones, adjustable torsion bars

Rear: Live axle with adjustable torsion bars

Steering Bevel gear segment and pinion

Brakes Four wheel hydraulic with servo, drum brakes, self adjusting

Handbrake: cable on rear wheels ( last cars with front discs)


Wheelbase 2835 mm

Track front/rear 1400 mm/1420 mm

Length/width 4750 mm/1710 mm

Tyres 6.00H x 16


Fuel capacity 75 litres

Max speed 118 mph

Number produced 412

Club Mailing Address

BMW Historic Motor Club
Lower Norgrove,
Yarrington Road,

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