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BMW 3/20 PS (AM 1-4)

Date of manufacture 1932 – 1934
Bodywork type(s) Saloon, 2 & 4 Seater Cabriolet, Roadster and Van
Engine Type Inline 4 cylinder
Capacity 782cc
Bore x stroke 56mm x 80mm
Power 20bhp @ 3500rpm
Compression 5.6:1
Carburettors 1, Solex 26 mm updraught
Valve design Overhead, 2 per cylinder
Valve gear Camshaft in block. Push rods, rockers, tappets and springs
Electrics 6 volt
Transmission Clutch Dry single disc
Gearbox ratios 3-speed (AM 1) (1932-1933) 4-speed (AM 4)(1933-1934)
1st 4.0:1 4.3:1
2nd 1.82:1 2.64:1
3rd 1.00:1 1.62:1
4th 1.00:1
Axle ratio 5.90 5.85
Synchromesh None
Chassis Frame Box section central backbone frame
Suspension Front: 1 transverse leaf spring only, friction dampers
Rear: Swing axle with 2 transverse leaf spring, friction dampers
Steering Worm
Brakes Four wheel   cable
Handbrake, cable on rear wheels
Dimensions Wheelbase 2150mm
Track front/rear 1100mm x 1100mm
Length/width 3200mm x 1420mm
Tyres 17 x 4.50in
General Fuel capacity 25 litres
Max speed 50 mph
Number produced 7215

 

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