BMW R 80 G / S
| BMW | |
|---|---|
 BMW R 80 G / S |
|
| R 80 G / S | |
| Manufacturer | BMW |
| Production period | 1980 to 1987 |
| class | motorcycle |
| design type | Travel enduro |
| Motor data | |
| Air-cooled two-cylinder four-stroke boxer engine | |
| Displacement (cm³) | 797.5 cc |
| Power (kW / PS ) | 37 kW (50 hp) at 6500 min -1 |
| Torque ( N m ) | 59 Nm at 3500 min -1 |
| Top speed ( km / h) | 170 |
| transmission | 5 courses |
| drive | Cardan drive |
| Brakes | Single disc brake Ø 260 mm at the front, simplex drum brake Ø 200 mm at the rear |
| Wheelbase (mm) | 1465 mm |
| Dimensions (L × W × H, mm): | 2230 × 820 × 1150 mm |
| Seat height (cm) | 86 |
| Empty weight (kg) | 192 |
| successor |
BMW R 80 GS BMW R 100 GS |
The BMW R 80 G / S was a motorcycle model from the vehicle manufacturer BMW . It was the first enduro with a multi-cylinder engine and the first series BMW with a single swing arm .
Their boxer engine with 797 cc displacement and 37 kW (50 hp) came from the BMW R 80/7 . This made it the most powerful, but also the heaviest enduro and the first ever travel enduro at the time of its introduction . BMW got back into cross-country racing with her and won the Paris-Dakar rally in 1981 , 1983 , 1984 and 1985 .
The motorcycle was presented to the international press in Avignon in September 1980 . From 1980 to 1987, 33,247 R 80 G / S were manufactured at the BMW plant in Berlin in Spandau . Marketing manager Heino D. Würfel described the R80 G / S as a “universally usable leisure tool for new forms of experience”. The successor models were the R 80 GS and R 100 GS with Paralever and the R 65 GS with Monolever.
Technical specifications
drive
Compared to the engine of the R80 / 7, the R80G / S has a reinforced housing, an improved oil circuit and a reduced flywheel. To increase wear resistance, the centrifugally cast cylinder liners of the R80 / 7 have been given a nickel coating with silicon carbide components (Galnical). The air-cooled two-cylinder engine produced from 797.5 cc capacity, a rated power of 37 kW (50 hp) and a maximum torque of 59 Nm at a speed of 3500 min -1 . The two Nikasil cylinders have a bore of 84.8 mm in diameter, the pistons have a stroke of 70.6 mm with a compression ratio of 8.2: 1. The longitudinally installed four-stroke engine has an inlet and an outlet valve for each cylinder; the valve is controlled via tappets , bumpers and needle-bearing rocker arms . Two Bing constant pressure carburetors generate the combustion mixture, the fuel required for this should have at least 91 octane. The oil for engine lubrication is collected in a wet sump. The raised exhaust system has a front silencer.
The motorcycle accelerates from 0 to 100 km / h in 6.6 seconds and reaches a top speed of 170 km / h with the rider lying down. The trade journal Motorrad measured an average fuel consumption of 5.6 liters per 100 km of country road and determined a theoretical range of 354 km.
Power transmission
- Clutch disc, dry, with translated cup spring
- Number of gears 5
- Switching claw switching (ratchet foot switching )
- Gear ratio 4.4 / 2.86 / 2.07 / 1.67 / 1.50: 1
- Rear wheel ratio 1: 3.364
- Bevel / ring gear 11/37 teeth
Electrical system
The alternator from Bosch produces an electrical output of 280 watts , which supplies in addition to the lighting system and the non-contact electronic ignition system from the same manufacturer. The engine is started by a 700 watt starter or a kick starter . The cockpit consists of a speedometer and five indicator lights; a tachometer was available as an option.
- Spark plug Bosch W 7 DC / Beru 14 - 7 DU / Champion N 9 YC / NGK BP6ES
landing gear
The double-loop tubular steel frame has a screwed-on rear section. A central spring strut with 170 mm suspension travel supports the single- sided rocker arm (monolever) towards the frame, the hydraulically damped telescopic fork on the front wheel has a suspension travel of 200 mm.
- Front rim 1.85 × 21 WM
- Rear rim 2.50 × 18 WM
- Front tires 3.00-21 R
- Rear tires 4.00-18 R
- Front brakes single disc brake Ø 260 mm
- Rear brakes Simplex drum brake Ø 200 mm
The cardan drive runs in the right-hand swing arm. Since it has no torque support, it generates load change forces and set-up torques due to the design, which can lead to the rear lifting when accelerating.
mass and weight
The empty weight when fully fueled and ready to drive is 192 kg. The gross vehicle weight is 398 kg, the maximum payload is 206 kg. The ground clearance between the underside of the engine and the road is 218 mm. The fuel tank has a capacity of 19.5 liters.
Model development
In the autumn of 1981 the G / S got a wider rear wheel rim, a modified master cylinder and a tighter seat. 1982 BMW improved the corrosion-prone black chrome exhaust system. December 1984 and later models have hardened exhaust valve seats and can tolerate unleaded fuel. Competitive models with comparable chassis geometry were the Yamaha XT 500 and the Honda XL 500 in the 1980s .
Reviews
“The technology of the two-valve valve with push rods is manageable and robust and can easily be repaired with a screwdriver and hammer even in the deserts of Africa or the Amazon region. […] The G / S is not made for extremely difficult terrain, but it plows down dirt roads and gravel roads. "
“The engine is not the most sparkling one, but it can be considered 'unbreakable'. Whether on the autobahn between Hamburg and Munich or on a corrugated iron road between Algiers and Tamanrasset, the boxer can do almost anything. And the driver anyway. But woe if the way to the end of the world gets too bumpy. Then it becomes clear that the R 80 G / S is nothing more than a tourer in an enduro costume, and the only off-road capable hand protectors are. "
“In a world where dual-purpose motorcycles were dirtbike-ish machines weighing 300 pounds or less with 500cc-or-smaller single-cylinder engines, the G / S was a truck, a 420-lb., Shaft-drive, 796cc twin with its opposed cylinders hanging out in the wind like outriggers. Even one BMW engineer admitted he wasn't quite sure where the bike fit into the big picture. After a day's ride on the paved and graded dirt roads around Avignon, the R80 G / S started to make a little more sense. As a streetbike, it was agile and flickable, a genuine treat in tight twisties despite its semi-knobby tires. And on the dirt roads, it was reasonably capable, even when some decent-sized bumps, ruts and holes were thrown into the mix. "
“In a world where general-purpose motorcycles were motocrossers weighing 300 pounds or less and with 500 cc single-cylinder engines, the G / S was a truck: 192 kg with driveshaft, 796 cc two-cylinder with opposing cylinders, the like outriggers in the wind. Even a BMW engineer had to admit that he wasn't entirely sure how the bike would fit into the bigger picture. After a day of driving the paved and leveled gravel roads around Avignon, the R80 G / S was starting to make a little more sense. As a street motorcycle it was agile and agile, a real pleasure in tight corners despite the half-studded tires. And it performed well enough on unpaved roads, even when it got in the way of some considerable bumps, ruts and holes. "
literature
- Andy Schwietzer, Werner R Reiss: BMW Boxer from R80 G / S: BMW two-valve from 1980 to 1996. Volume 2: All models with single-sided swing arm . Bodensteiner Verlag, 2010, ISBN 978-3-9806631-6-8 .
- Classic car market . October 2010 edition, ISSN 0939-9704 , pp. 28–35.
Web links
- Manufacturer's website
- Werner Koch: Restoration BMW R 80 G / S . In: Motorrad Classic. Issues 7/2014–3/2015. ISSN 0937-9495
- David Cushing: Micapeak . June 2010. (English)
Individual evidence
- ↑ Successes in the desert. In: brand.bmw-motorrad.com. BMW AG, Munich, August 2018, accessed on January 20, 2019 .
- ^ A b Paul Dean: 1981 BMW R80 G / S - Feature. In: Cycle World. January 17, 2012, accessed August 19, 2015 .
- ↑ Thomas Schmieder: The GS phenomenon . In: Motorcycle - BMW Special . No. 1 , 2015, ISSN 0935-7645 , p. 38-42 .
- ^ A b Peter Maierbacher: The best street motorcycle that BMW ever built . In: motorcycle . No. 17 , 1980, ISSN 0935-7645 , p. 6-11 .
- ↑ a b c Gerhard Eirich: BMW R 80 G / S and Honda XLV 750 R in comparison . In: motorcycle . No. 8 , 2012, ISSN 0935-7645 .
- ↑ a b c d Fabian Hoberg: Unrestrained into adventure. In: Spiegel Online . July 21, 2013. Retrieved July 21, 2013 .
- ↑ Gerhard Eirich: Generation comparison: BMW GS models . In: motorcycle . No. 2 , 2012, ISSN 0935-7645 .
- ^ Konstantin Winkler: BMW R 80 G / S. In: bma, edition 6/2000. June 1, 2000, accessed August 19, 2015 .
