BMW R 3

BMW R 3 Date 1936

Number sold 740

Price 955,- RM

Engine

Internal Designation M 203/1
Engine type four-stroke vertical single cylinder engine
Bore/stroke 68 x 84 mm
Cubic capacity 305 cm3
Max power 11 PS at 4200 rpm
Compression ratio 6,0 : 1
Valves per cylinder ohv
Carburation system 1 carburettor Typ SUM CK 3/500 Fr
Engine lubrication forced-feed lubrication
Oil pump gear pump

Power transmission

Clutch single discs, dry
Number of gears 4
Shifting manual
Gear ratios 3,6 / 2,18 / 1,35 / 1,1
Rear wheel ratio 1 : 5,11 (with sidecar 1: 5,63)
Bevel/crown wheel 9 / 46 teeth (with sidecar (8 / 45)

Electrical system

Alternator Bosch 6 V 45/70 Watt,
Ignition battery ignition
Spark plugs Bosch DM 175 T 1

Suspension

Designation 203/1
Type of frame Preßstahl-Doppelschleifenframe
Front suspension cantilever spring, 9 laminae mit Reibungsstossdämpfer
Rear suspension rigid
wheel rims 2,50 x 19
Tyres front 26 x 3,50 Ballon
Tyres rear 26 x 3,50 Ballon
Brakes front drum brake
Brakes rear drum brake

Dimensions and weights

Length x width x height 1980 x 850 x 950 mm
Wheel base 1320 mm
Tank capacity 12 l
Unladen weight, full tank 149 kg
permitted loading 200 kg
Fuel consumption ca. 3 l / 100 km
Oil consumption ca. 1 - 2 l / 1000 km
Top speed 100 km/h

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