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Difference between revisions of "BMW R47"
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{{DISPLAYTITLE:{{PAGENAME}}: history, specs, pictures}} | |||
[[Image:1927-BMW-R47.jpg|left|thumb|1927 BMW R47]] | [[Image:1927-BMW-R47.jpg|left|thumb|1927 BMW R47]] | ||
<br | [[Image:R47.jpg|thumb|350px|BMW R47]] | ||
[[BMW]]'s first sports model, the [[BMW R37|BMW R37]], appeared in 1924, joining the original [[BMW R32|BMW R32]] tourer. The [[BMW R37|BMW R37]] boasted a new overhead-valve engine producing 16bhp, almost double the R32's power output, but was produced for little more than a year before being replaced by the improved [[BMW|BMW]]R47. The latter was introduced in 1926 alongside the sidevalve-engined R42 tourer, both models benefiting from a redesigned and more powerful engine boasting detachable alloy cylinder heads and cooling fins set at 90 degrees to the cylinder axis. The engine was set further back in the duplex loop frame, which improved weight distribution and enabled straight front down-tubes to be used. The braking too came in for attention: the old block-and-pulley type rear brake being replaced by a drum on the driveshaft gripped by external contracting bands. Electric lighting was still regarded as an 'extra' and would not be standardised until 1928. Maximum power output of the R47 was 18bhp and its top speed in the region of 70mph (113km/h). R47 production lasted for just two years, 1,720 machines being sold. | |||
{{BMW}} | |||
[[Category:BMW motorcycles|R47, BMW]] | |||
[[Category:BMW R series]] | |||
{{Motorcycle | |||
|name = BMW R47 | |||
|photo= 1927-BMW-R47.jpg | |||
|aka = | |||
|manufacturer = BMW | |||
|parent_company = | |||
|production = 1927 - 1928 | |||
|model_year = | |||
|predecessor = | |||
|successor = | |||
|class = | |||
|engine = two cylinder boxer, four-stroke | |||
|bore_stroke = 68.0mm x 68.0mm | |||
|compression = | |||
|top_speed = 68 mph (110 km/h) | |||
|power = 17.57 HP (13.1 KW) @ 4000RPM | |||
|torque = | |||
|fuel_system = carburetor. 20mm bmw spezial | |||
|ignition = bosh magneto | |||
|spark_plug = | |||
|battery = | |||
|transmission = Gear box: 3-speed <br> | |||
Final Drive: [[shaft drive]] (cardan) <br> | |||
Clutch: dry-single plate-cable operated <br> | |||
|frame = | |||
|suspension =Front: leading link <br> | |||
Rear: rigid | |||
|brakes =Front: expanding [[brake]] (drum brake) <br> | |||
|front_tire = {{tire|3.50-27}} | |||
|rear_tire = {{tire|3.50-27}} | |||
|rake_trail = | |||
|wheelbase = 55.51 inches (1410 mm) | |||
|length = 82.68 inches (2100 mm) | |||
|width = 31.5 inches (800 mm) | |||
|height = 37.4 inches (950 mm) | |||
|seat_height = | |||
|dry_weight = | |||
|wet_weight = 126.0 kg | |||
|fuel_capacity = 3.7 Gallon (14.00 Liters) | |||
|oil_capacity = | |||
|fuel_consumption = 3.00 liters/100 km (33.3 km/l or 78.41 mpg) | |||
|turning_radius = | |||
|related = | |||
|competition = | |||
}} | |||
The '''[[BMW]] R47''' was a two cylinder boxer, [[four-stroke]] standard produced by [[BMW]] between 1927 and 1928. It could reach a top speed of 68 mph (110 km/h). Claimed [[horsepower]] was 17.57 HP (13.1 KW) @ 4000 RPM. | |||
==Engine== | |||
The engine was a [[air cooled]] two cylinder boxer, four-stroke. A 68.0mm [[bore]] x 68.0mm [[stroke]] result in a [[displacement]] of just 494.0 cubic centimeters. Fuel was supplied via a overhead valves (ohv). | |||
==Drive== | |||
The bike has a 3-speed transmission. Power was moderated via the dry-single plate-cable operated. | |||
==Chassis== | |||
It came with a 3.50-27 front [[tire]] and a 3.50-27 rear tire. The front suspension was a leading link while the rear was equipped with a rigid. The R47 was fitted with a 3.7 Gallon (14.00 Liters) fuel tank. The wheelbase was 55.51 inches (1410 mm) long. | |||
[[Category:standard motorcycles]] | |||
[[Category:BMW motorcycles]] | |||
[[Category:1920s motorcycles]] | |||