Hello everyone, this is my first post on the forum. I知 looking for engine technical specifications for late model BMW motorcycle engines but I知 a complete newbie when it comes to motorcycles so all that I know is what I read on Wikipedia. Anyway, can someone point me to where I can find some detailed technical specs on a modern BMW flat-twin motor with overhead cams? I知 looking for things like crankshaft journal diameter, connecting rods weights and lengths etc. TIA.
You mean this stuff?
Technical Data R 1150 GS
Engine, general
Engine design Four-stroke flat twin, air-cooled with oilcooled
exhaust ports, installed longitudinally,
4 valves per cylinder, two overhead
camshafts, electronic fuel injection.
Location of engine number Crankcase
Cylinder bore mm (in) 101 (3.97)
Stroke mm (in) 70.5 (2.78)
Effective displacement cc 1,130
Compression ratio 10.3 : 1
Power output kW/(bhp)/rpm 62.5/(85)/6,750
Max. torque Nm/rpm 98/5,250
Permissible maximum engine speed rpm 7,900
Idle speed rpm 1,100+50
Direction of rotation Clockwise, looking at ignition system
Compression test pressure
good
normal
poor
bar (psi)
bar (psi)
bar (psi)
above 10 (142)
8.5 ... 10 (121 ... 142)
below 8.5 (121)
Intake port dia./cylinder head mm (in) 44 (1.7)
Lubrication system
Theoretical volume in circulation at 6,000 rpm
Lubricating oil
Cooling oil
l (Imp.gal/
US gal)
l (Imp.gal/
US gal)
30 (6.6/7.9)
33 (7.3/8.7)
Oil filter Full-flow type
Pressure differential needed to open bypass valve bar (psi) 1.5 (21.3)
Oil pressure warning light comes on below bar (psi) 0.3 (4.2)
Pressure relief valve opens at bar (psi) 5.5 (78.3)
Operating pressure bar (psi) 3.5 ... 6.0 (49.8 ... 85.4)
Oil content without filter change
with filter change
min/max
l (Imp.pint/
US quart)
l (Imp.pint/
US quart)
l (Imp.pint/
US quart)
3.50 (6.16/3.70)
3.75 (6.60/3.96)
0.5 (0.88/0.53)
Permissible oil consumption
I/1,000 km (miles per Imp.pint/miles per US quart) 1.0 (350/390)
Oil pump
Oil capacity 2 Duocentric pumps
Housing depth
Cooling oil
Lube oil
mm (in)
mm (in)
11.02 ... 11.05 (0.434 ... 0.435)
10.02 ... 10.05 (0.394 ... 0.396)
Height of rotor
Cooling oil
Lube oil
mm (in)
mm (in)
10.965 ... 10.98 (0.431 ... 0.432)
9.965 ... 9.98 (0.392 ... 0.393)
Axial play mm (in) 0.04 ... 0.085 (0.002 ... 0.003)
Wear limit mm (in) 0.25 (0.010)
