Difference between revisions of "BMW R4"

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m (New page: right|thumb|1933 BMW R4 BMW produced 15,200 '''R4''' motorcycles using innovative mass production techniques, setting new standards of design and quality....)
 
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[[Image:1933 BMW R4.jpg|right|thumb|1933 BMW R4]]
{{DISPLAYTITLE:{{PAGENAME}}: history, specs, pictures}}
{{Motorcycle
|name            = '''BMW R 4'''
|photo=R4.jpg
|aka              =
|manufacturer    = [[BMW]]
|parent_company  =
|production      = 1932 - 1937
|model_year      =
|predecessor      =
|successor        =
|class            = [[Classic]]
|engine          = air-cooled, four-stroke, single vertical cylinder
|bore_stroke      = 83.8mm x 83.8mm
|fuel_system      = carburetor. sum ck 3/500 fr
|compression      = 5.7:1
|top_speed        = 59 mph (95 km/h)
|power            = 13.95 HP (10.4 KW) @ 4000RPM
|torque          =
|ignition        =
|spark_plug      =
|battery          =
|transmission    = Gear box: 4-speed, manual <br>
Final Drive: [[shaft]] <br>
Clutch: dry, single plate <br>
 
|frame            =
|suspension      =Front: parallelogram fork <br>
Rear: hard-tail, sprung seat
|brakes          =Front: 160mm drum <br>Rear: 160mm drum
|front_tire      = {{tire|3.50 x 26}}
|rear_tire    = {{tire|3.50 x 26}}
|rake_trail      =
|wheelbase        =
|length          =
|width            =
|height          =
|seat_height      =
|dry_weight      =
|wet_weight      = 137.0 kg
|fuel_capacity    =
|oil_capacity    =
|fuel_consumption = 3.50 liters/100 km (28.6 km/l or 67.21 mpg)
|turning_radius  =
|related          =
|competition      =
}}
 
The '''[[BMW]] R4''' was a air-cooled, four-stroke, single vertical cylinder Classic [[motorcycle]] produced by [[BMW]] in 1932. Claimed [[horsepower]] was 13.95 HP (10.4 KW) @ 4000 RPM. 
 
 
[[Image:R4.jpg|thumb|350px|BMW R4]]
[[BMW]] produced 15,200 '''R4''' [[motorcycles]] using innovative mass production techniques, setting new standards of design and quality.  Pressed steel frame and components were quick and easy to stamp out and assemble, reducing manufacturing costs.
[[BMW]] produced 15,200 '''R4''' [[motorcycles]] using innovative mass production techniques, setting new standards of design and quality.  Pressed steel frame and components were quick and easy to stamp out and assemble, reducing manufacturing costs.


[[Category:BMW motorcycles]]
Introduced in 1932 and intended to bridge the gap between the 'budget' [[BMW R2|BMW R2]] 198cc single and the expensive twins, the R4 looked much like the former, whose channel-section steel frame and running gear it used almost unaltered. The 398cc overhead-valve engine featured enclosed valve gear and produced 12bhp, gaining an extra two horsepower in 1933 when the [[BMW|BMW]] R4 was updated to Series 2 specification with revised styling and a four-speed gearbox. A new cylinder head, tidier engine casings and changes to the toolbox and generator locations were introduced as the rugged R4 - a favourite with police forces and the German Army - progressed through to Series 5 before production ceased in 1936.
 
==Engine==
A 83.8mm [[bore]] x 83.8mm [[stroke]] result in a [[displacement]] of just 498.0 cubic centimeters. 
 
==Drive==
The bike has a 4-speed, manual transmission. Power was moderated via the dry, single plate. 
 
==Chassis==
It came with a 3.50 x 26 front [[tire]] and a 3.50 x 26 rear tire. Stopping was achieved via 160mm drum in the front and a 160mm drum in the rear. The front suspension was a  parallelogram fork while the rear was equipped with a hard-tail, sprung seat. 
 
==1932 - 1937 BMW R 4==
<gallery mode="slideshow">
File:bmw-r-4-1932-1937-3.jpg|600px|1932 - 1937 BMW R 4
File:bmw-r-4-1932-1937-2.jpg|600px|1932 - 1937 BMW R 4
File:bmw-r-4-1932-1937-1.jpg|600px|1932 - 1937 BMW R 4
File:bmw-r-4-1932-1937-0.jpg|600px|1932 - 1937 BMW R 4
</gallery>
 
The 1932 BMW R 4 has, at its heart, an air-cooled, four-stroke, 498cc, single vertical cylinder engine mated to a four-speed manual transmission that can produce a claimed 14 horsepower at 4000 rpm. This classic machine had standard features such as laced wheels, full fenders, a hard-tail rear suspension with a sprung seat, a parallelogram front suspension, a large headlight, a rear luggage rack and an exhaust system with a large-diameter muffler.
 
 
==In Media==
* [https://motopixel.org/pixel/jeder-stirbt-fur-sich-allein#bmw-r-4 Jeder stirbt für sich allein]
* [https://motopixel.org/pixel/roma-citta-aperta#bmw-r-4 Rome, Open City]
 
{{BMW}}
[[Category:Classic motorcycles]]
[[Category:BMW motorcycles|R4]]
[[Category:1930s motorcycles]]
[[Category:BMW R series]]
[[Category:1930s motorcycles]]
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