Difference between revisions of "BMW R4"

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{{DISPLAYTITLE:{{PAGENAME}}: history, specs, pictures}}
 
{{Infobox Motorcycle
 
{{Infobox Motorcycle
 
|name            = '''BMW R 4'''
 
|name            = '''BMW R 4'''
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[[Category:BMW R series]]
 
[[Category:BMW R series]]
 
[[Category:1930s motorcycles]]
 
[[Category:1930s motorcycles]]
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{{Infobox Motorcycle
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|name            = '''BMW R4'''
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|image            =
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|aka              = R4 Series 1, R4 Series 2, R4 Series 3, R4 Series 4, R4 Series 5
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|manufacturer    = [[BMW]]
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|parent_company  =
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|production      = 1932 - 1937
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|model_year      =
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|predecessor      =
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|successor        =
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|class            =
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|engine          = single cylinder, four-stroke
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|bore_stroke      = 84.0mm x 78.0mm
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|compression      =
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|top_speed        = 59 mph (95 km/h)
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|power            = 13.68 HP (10.2 KW) @ 4000RPM
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|torque          =
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|fuel_system      = carburettor. sum ck 3/500 fr
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|ignition        = battery
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|spark_plug      =
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|battery          = 5.7:1
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|transmission    = Final Drive: [[shaft drive]] (cardan) <br>
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Clutch: dry-single plate-cable operated <br>
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|frame            =
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|suspension      =Front: cartridge <br>
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Rear: rigid
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|brakes          =Front: expanding [[brake]] (drum brake) <br>Rear: expanding brake (drum brake)
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|front_tire      = {{tire|3.50-26.00}}
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|rear_tire    = {{tire|3.50-26.00}}
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|rake_trail      =
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|wheelbase        = 51.3 inches (1303 mm)
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|length          = 77.95 inches (1980 mm)
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|width            = 33.46 inches (850 mm)
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|height          = 37.76 inches (959 mm)
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|seat_height      =
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|dry_weight      =
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|wet_weight      = 137.0 kg
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|fuel_capacity    = 3.17 Gallon (12.00 Liters)
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|oil_capacity    =
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|fuel_consumption = 3.50 litres/100 km (28.6 km/l or 67.21 mpg)
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|turning_radius  =
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|related          =
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|competition      =
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}}
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The '''[[BMW]] R4 Series 5''' was a single cylinder, [[four-stroke]] standard produced by [[BMW]] between 1932 and 1937. It could reach a top speed of 59 mph (95 km/h). Claimed [[horsepower]] was 13.68 HP (10.2 KW) @ 4000 RPM. 
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==Engine==
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The engine was a [[air cooled]] single cylinder, four-stroke. A 84.0mm [[bore]] x 78.0mm [[stroke]] result in a [[displacement]] of just 398.0 cubic centimeters. Fuel was supplied via a overhead valves (ohv). 
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==Drive==
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Power was moderated via the dry-single plate-cable operated. 
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==Chassis==
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It came with a 3.50-26.00 front [[tire]] and a 3.50-26.00 rear tire. Stopping was achieved via expanding brake (drum brake) in the front and a expanding brake (drum brake) in the rear. The front suspension was a  cartridge while the rear was equipped with a rigid. The R4 Series 5 was fitted with a 3.17 Gallon (12.00 Liters) fuel tank. The wheelbase was 51.3 inches (1303 mm) long. 
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[[Category:standard motorcycles]]
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[[Category:BMW motorcycles]]
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[[Category:1930s motorcycles]]
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[[Category:Motorcycles needing images]]

Revision as of 17:57, 24 May 2019

BMW R 4
BMW R4
Manufacturer BMW
Production 1932
Class Classic
Engine air-cooled, four-stroke, single vertical cylinder
Bore / Stroke 83.8mm x 83.8mm
Compression ratio 5.7:1
Horse Power 13.95 HP (10.4 KW) @ 4000RPM
Transmission Gear box: 4-speed, manual

Final Drive: shaft

Clutch: dry, single plate
Suspension Front: parallelogram fork
Rear: hard-tail, sprung seat
Brakes Front: 160mm drum
Rear: 160mm drum
Front Tire 3.50 x 26
Rear Tire 3.50 x 26
Weight  (dry), 137.0 kg (wet)
Manuals Service Manual
Tech Specs · Brochures · Reviews · Ads · Videos

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.


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.

Introduced in 1932 and intended to bridge the gap between the 'budget' 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 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

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

BMW R4
Manufacturer BMW
Also called R4 Series 1, R4 Series 2, R4 Series 3, R4 Series 4, R4 Series 5
Production 1932 - 1937
Engine single cylinder, four-stroke
Bore / Stroke 84.0mm x 78.0mm
Top speed 59 mph (95 km/h)
Horse Power 13.68 HP (10.2 KW) @ 4000RPM
Fuel system carburettor. sum ck 3/500 fr
Ignition type battery
Battery 5.7:1
Transmission Final Drive: shaft drive (cardan)
Clutch: dry-single plate-cable operated
Suspension Front: cartridge
Rear: rigid
Brakes Front: expanding brake (drum brake)
Rear: expanding brake (drum brake)
Front Tire 3.50-26.00
Rear Tire 3.50-26.00
Wheelbase 51.3 inches (1303 mm)
Dimensions L 77.95 inches (1980 mm)
W 33.46 inches (850 mm)
H 37.76 inches (959 mm)
Weight  (dry), 137.0 kg (wet)
Fuel capacity 3.17 Gallon (12.00 Liters)
Fuel consumption 3.50 litres/100 km (28.6 km/l or 67.21 mpg)
Manuals Service Manual
Tech Specs · Brochures · Reviews · Ads · Videos

The BMW R4 Series 5 was a single cylinder, four-stroke standard produced by BMW between 1932 and 1937. It could reach a top speed of 59 mph (95 km/h). Claimed horsepower was 13.68 HP (10.2 KW) @ 4000 RPM.

Engine

The engine was a air cooled single cylinder, four-stroke. A 84.0mm bore x 78.0mm stroke result in a displacement of just 398.0 cubic centimeters. Fuel was supplied via a overhead valves (ohv).

Drive

Power was moderated via the dry-single plate-cable operated.

Chassis

It came with a 3.50-26.00 front tire and a 3.50-26.00 rear tire. Stopping was achieved via expanding brake (drum brake) in the front and a expanding brake (drum brake) in the rear. The front suspension was a cartridge while the rear was equipped with a rigid. The R4 Series 5 was fitted with a 3.17 Gallon (12.00 Liters) fuel tank. The wheelbase was 51.3 inches (1303 mm) long.