BMW R 51 (1938-40)
Comparison technical specifications
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Make: | BMW |
Model: | R 51 |
Years: | 1938-40 |
Engine: | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. |
Capacity: | 494 cc / 30.1 cu in. |
Bore x Stroke: | 68 x 68 mm |
Compression Ratio: | 6.7:1 |
Cooling System: | Air cooled |
Induction: | 2 x Amal 5/423 carburetors |
Ignition: | Battery ignition |
Starting: | Kick |
Clutch: | Single plate, dry |
Max Power: | 18 kW / 24 hp @ 5800 rpm |
Transmission: | 4 Speed |
Final Drive: | Shaft |
Gear Ratio: | 1st 3.60 / 2nd 2.28 / 3rd 1.70 / 4th 1.30:1 |
Frame: | Closed double loop steel tubular frame |
Front Suspension: | Telescopic fork |
Rear Suspension: | Long swing arm with suspension units and oil pressure shock absorbers |
Front Brakes: | ∅200mm Drum, duplex full hub |
Rear Brakes: | ∅200mm Drum, simplex full hub |
Front Tyre: | 3.50 -19" |
Rear Tyre: | 3.50 -19" |
Wet-Weight: | 182 kg / 400 lbs |
Fuel Capacity: | 14 liters / 3.60 US gal |