BMW Motorcycle (R1100RT, R1100RS, R850/1100GS, R850/1100R). Manual - part 7

11.4

11.5

11

Technical Data

R 1100 RS

Engine, general

Engine design

Four-stroke flat twin, air-cooled with oil-cooled 
exhaust ports, installed longitudinally, 4 valves 
per cylinder, two high-mounted camshafts, elec-
tronic fuel injection.

Location of engine number

Crankcase

Cylinder bore

mm (in)

99.0 (3.898)

Stroke

mm (in)

70.5 (2.776)

Effective displacement

cc

1085

Compression ratio

10.7 : 1

Power output 

kW(bhp)/min

-1

66(90)/7250

Max. torque 

Nm/min

-1

95/5500

Permissible maximum engine speed

min

-1

7900

Permissible continuous engine speed

min

-1

7600

Idle speed

min

-1

1000 

+150

Direction of rotation

Clockwise, looking at 
ignition system

Compression test pressure

good
normal

poor

bar (psi)
bar (psi)

bar (psi)

above 10 (145.04)
8.5...10 
(123.28...145.04)
below  8.5(123.28)

Intake port dia./cylinder head

mm (in)

44 (1.732)

Lubrication system

Theoretical volume in circulation at 6000 min

-1

Lubricating oil

l (Imp. pints)

Cooling oil

l (Imp. pints)

36 (63.36)
30 (52.8)

Oil filter

Full-flow type

Pressure differential needed to open bypass 
valve

bar (psi)

1.5 (21.756)

Oil pressure warning light comes on below

bar (psi)

0.2...0.5 (2.9...7.25)

Pressure relief valve opens at

bar (psi)

5.5 (79.77)

Operating pressure

bar (psi)

3.5...6.0 (50.76...87.02)

Oil content

without filter change

l (Imp. pints)

with filter change

l (Imp. pints)

min/max

l (Imp. pints)

3.50 (6.16)
3.75 (6.6)
0.50 (0.88)

Permissible oil consumption

l/1000 km

Imp.pint/miles

1.0
(1.41/500)

Oil pump

Oil pump

2 Duocentric pumps

Housing depth

mm (in)
mm (in)

12.02...12.05 
(0.47322...0.47441)
10.02...10.05 
(0.3945...0.3957)

Height of rotor

mm (in)
mm (in)

11.95...11.98 
(0.4705...0.4717)
9.95...9.98 
(0.3917...0.3929)

Axial play

mm (in)

0.04...0.1 
(0.0016...0.0039)

Wear limit

mm (in)

0.25 (0.0098)

11.6

Valves

Included angle between valves

°

41

Valve clearances, engine cold (max. 35 °C)

Inlet valve

mm (in)

0.15 (0.0059)

Exhaust valve

mm (in)

0.30 (0.0118)

Valve timing

Zero valve clearance. 3 mm (0.1181 in) valve lift

Inlet opens

5° after TDC

Inlet closes

33° after BDC

Exhaust opens

27° before BDC

Exhaust closes

5° before TDC

Tolerance ± 3°

Valve head dia.

Inlet

mm (in)

36 (1.4173)

Exhaust

mm (in)

31(1.2205)

from 1996 mod. year on

Inlet

mm (in)

34 (1.3386)

Exhaust

mm (in)

29 (1.1417)

Stem dia.

Inlet

mm (in)

5.960...5.975 
(0.23465...0.23524)

Wear limit

mm (in)

5.940 (0.23386)

Exhaust

mm (in)

5.945...5.960 
(0.23406...0.23465)

Wear limit

mm (in)

5.925 (0.23327)

from 1996 mod. year on

Inlet

mm (in)

4.966...4.980 
(0.16551...0.19606)

Wear limit

mm (in)

4.946 (0.19472)

Exhaust

mm (in)

4.956..4.970 
(0.19512...0.19567)

Wear limit

mm (in)

4.936 (0.19433)

Valve head edge thickness

Inlet

mm (in)

1.00 

± 0.2

 

(0.03937 

± 0.00787

)

Wear limit

mm (in)

0.5 (0.01969)

Exhaust

mm (in)

1.65 

± 0.2

 

(0.06496 

± 0.00787

)

Wear limit

mm (in)

1.0 (0.03937)

from 1996 mod. year on

Inlet

mm (in)

1.00 

± 0.2

(0.03937 

± 0.00787

)

Wear limit

mm (in)

0.5 (0.01969)

Exhaust

mm (in)

1.00 

± 0.2

(0.03937 

± 0.00787

)

Wear limit

mm (in)

0.5 (0.01969)

Max. runout of valve head at valve seat

Inlet, exhaust

mm (in)

0.035 (0.001378)

Technical Data

R 1100 RS

11.7

Valve seat ring

Valve seat angle

Inlet

45°

Exhaust

30°

from 1996 mod. year on

Inlet

45°

Exhaust

45°

Valve seat width

Inlet

mm (in)

1.1 

± 0.15

 

(0.04331 

± 0.00591

)

Wear limit

mm (in)

2.5 (0.09843)

Exhaust

mm (in)

1.4

 ± 0.15

(0.05512 

± 0.00591

)

Wear limit

mm (in)

3.0 (0.11811)

Valve seat extl. dia. (dimension for valve seat 
machining)

Inlet

mm (in)

35.2 

± 0.1

 

(1.38583 

± 0.003937

)

Exhaust

mm (in)

30.3 

± 0.1

 

(1.19291 

± 0.00393

)

from 1996 mod. year on

Inlet

mm (in)

33.4 

± 0.1

 

(1.31496 

± 0.00393

)

Exhaust

mm (in)

28.4 

± 0.1

 

(1.11811 

± 0.00393

)

Seat ring dia. (oversize +0.2 mm)

Inlet

mm (in)

37.634...37.650 
(1.48165...1.48228)

Exhaust

mm (in)

34.134...34.150 
(1.34386...1.34449)

from 1996 mod. year on

Inlet

mm (in)

36.617...36.633 
(1.44161...1.44224)

Exhaust

mm (in)

32.134...32.150 
(1.26512...1.26575)

Seat dia. in cylinder head (oversize +0.2 mm)

Inlet

mm (in)

37.500...37.525 
(1.47638...1.47736)

Exhaust

mm (in)

34.000...34.025 
(1.33859...1.33957)

from 1996 mod. year on

Inlet

mm (in)

36.500...36.525 
(1.43701...1.43799)

Exhaust

mm (in)

32.000...32.025 
(1.25984...1.26083)

Technical Data

R 1100 RS

11.8

Valve guide

Valve guide

Extl. dia.

mm (in)

12.533...12.544 
(0.49343...0.49386)

Bore in cylinder head

mm (in)

12.500...12.518 
(0.49213...0.49283)

Overlap

mm (in)

0.015...0.044 
(0.00059...0.001732)

Repair stages

Replacement valve guide Extl. dia.

mm (in)

12.550...12.561 
(0.49409...0.49453)

Oversize valve guide

Extl. dia.

mm (in)

12.733...12.744 
(0.501299...0.501732)

Valve guide

Intl. dia.

mm (in)

6.0...6.015 
(0.23622...0.23681)

Radial clearance

Inlet

mm (in)

0.025...0.055 
(0.000984...0.002165)

Wear limit

mm (in)

0.15 (0.00591)

Exhaust

mm (in)

0.040...0.070 
(0.001575...0.002756)

Wear limit

mm (in)

0.17 (0.006693)

from 1996 mod. year on

Valve guide

Intl. dia.

mm (in)

5.0...5.012 
(0.19685...0.19732)

Radial clearance

Inlet

mm (in)

0.020...0.046 
(0.000787...0.001811)

Wear limit

mm (in)

0.15 (0.00591)

Exhaust

mm (in)

0.030...0.056 
(0.0011811...0.002205)

Wear limit

mm (in)

0.17 (0.006693)

Valve spring

Spring length, 

off-load

mm (in)

41.1 (1.61811)

Wear limit

mm (in)

39.0 (1.53543)

Rocker

Bore dia.

mm (in)

16.016...16.027 
(0.63055...0.63984)

Rocker shaft dia.

mm (in)

15.973...15.984 
(0.62886...0.62929)

Radial clearance

mm (in)

0.032...0.054 
(0.001259...0.002126)

Wear limit

mm (in)

0.1 (0.003937)

Axial play

min.

mm (in)

0.05 (0.001969)

max.

mm (in)

0.40 (0.01575)

Technical Data

R 1100 RS

11.9

Camshaft

Opening angle, inlet/exhaust cams

300°

Cam spread, inlet/exhaust

106°/109°

Marking

Marking in 
position 4

Inlet valve lift

mm (in)

9.68 (0.3811)
(valve clearance = 0)

Exhaust valve lift

mm (in)

9.26 (0.36457)
(valve clearance = 0)

Camshaft bearing bore dia.

mm (in)

21.02...21.04 
(0.82756...0.828346)

Camshaft dia.

mm (in)

20.97...21.00 
(0.82559...0.82677)

Radial clearance

mm (in)

0.02...0.07 
(0.000787...0.0027559)

Wear limit

mm (in)

0.15 (0.0059055)

Width of guide bearing

mm (in)

15.92...15.95 
(0.62677...0.62795)

Width of camshaft bearing

mm (in)

16.0...16.05 
(0.62992...0.6318897)

Axial play

mm (in)

0.08...0.13 
(0.0031496...0.005118)

Wear limit

mm (in)

0.25 (0.0098425)

Bucket-type tappet

Extl. dia.

mm (in)

23.947...23.960 
(0.942795...0.9433)

Bore dia. in cylinder head

mm (in)

24.000...24.021 
(0.94488...0.94571)

Radial clearance

mm (in)

0.040...0.074 
(0.00175...0.002913)

Wear limit

mm (in)

0.18 (0.0070866)

Auxiliary shaft

Bore dia. in crankcase

front/back

mm (in)

25.020...25.041 
(0.98504...0.985866)

Auxiliary shaft dia.

front/back

mm (in)

24.959...24.980 
(0.98264...0.98346)

Radial clearance

mm (in)

0.040...0.082 
(0.001575...0.003228)

Wear limit

mm (in)

0.17 (0.006693)

Technical Data

R 1100 RS

11.10

Crankshaft

Marking of main bearing and crankpin on 
front crank web

no paint mark

Grinding stage 0

paint mark

Grinding stage 1 
-0.25mm (-0.009843 in)

Grinding stage 0 (grinding stage 1= —0.25mm)

Guide bearing bore dia.

mm (in)

64.949...64.969 
(2.557047...2.557834)

Guide bearing dia.

mm (in)

Green: 
59.964...60.003 
(2.36079...2.36232)

Yellow: 59.974...60.013 
(2.36118...2.36272)

Main bearing journal dia.

mm (in)

Green: 
59.939...59.948 
(2.35980...2.360157)

Yellow: 59.949...59.958 
(2.360197...2.36055)

Radial clearance

mm (in)

0.016...0.064 
(0.0006299..0.002519)

Wear limit

mm (in)

0.1 (0.003937)

Main bearing bore dia.

mm (in)

60.000...60.019 
(2.3622...2.36295)

Main bearing dia.

mm (in)

Green: 54.998...55.039
(2.16528...2.16689)

Yellow: 55.008...55.049 
(2.16567...2.16728)

Main bearing journal dia.

mm (in)

Green: 54.971...54.980
(2.1642...2.164567)

Yellow: 54.981...54.990 
(2.16461...2.16496)

Radial clearance

mm (in)

0.018...0.068 
(0.0001086....002677)

Wear limit

mm (in)

0.13 (0.005118)

Width of guide bearing

mm (in)

24.890...24.940 
(0.97992...0.98189)

Bearing width of main bearing journal

mm (in)

25.020...25.053 
(0.98504...0.986339)

Axial play

mm (in)

0.080...0.163 
(0.0031496...0.006417)

Wear limit

mm (in)

0.2 (0.007874)

Grinding stage 0 (grinding stage1= –0.25mm)

Crankpin dia.

mm (in)

47.975...47.991 
(1.88878...1.88941)

Bearing width of crankpin

mm (in)

22.065...22.195 
(0.86870...0.87381)

Connecting rod

Big end bore dia.

mm (in)

51.000...51.013 
(2.00787...2.008386)

Big end bearing dia.

mm (in)

48.016...48.050 
(1.89039...1.89173)

Radial clearance

mm (in)

0.025...0.075 
(0.000984...0.0029527)

Wear limit

mm (in)

0.13 (0.001118)

Technical Data

R 1100 RS

11.11

Width of big end bearing eye

mm (in)

21.883...21.935 
(0.86154...0.86358)

Conrod end float

mm (in)

0.130...0.312 
(0.005118...0.0122834)

Wear limit

mm (in)

0.5 (0.019685)

Small end bearing bore dia.

mm (in)

22.015...22.025 
(0.86673...0.867126)

Radial clearance

mm (in)

0.015...0.030 
(0.0005905...0.0018)

Wear limit

mm (in)

0.06 (0.0023622)

Distance between centers

mm (in)

125 (4.92126)

Max. deviation from parallel of conrod bores 
at 150 mm spacing

mm (in)

0.07 (0.0027559)

Cylinders

Bore

20 mm (0.7874 in)
from top edge

A

mm (in)

98.992...99.000 
(3.89732...3.897638)

Wear limit

mm (in)

99.050 (3.899606)

B

mm (in)

99.000...99.008 
(3.897638...3.897953)

Wear limit

mm (in)

99.058 (3.899921)

Total wear clearance of piston and cylinder

mm (in)

0.12 (0.0047244)

Permitted out-of-roundness of cylinder bore

20 mm from the top edge

mm (in)

0.03 (0.0011811)

100 mm from the lower edge

mm (in)

0.04 (0.0015748)

Pistons

Piston dia.

Measuring plane A — 

a

 see Checking pistons 

and cylinders

A

mm (in)

98.965...98.977 
(3.89626...3.896732)

Wear limit

mm (in)

98.890 (3.8933)

B

mm (in)

98.977...98.989 
(3.896732...3.897204)

Wear limit

mm (in)

98.900 (3.8937)

AB

mm (in)

98.973...98.981 
(3.89657...3.8968897)

Wear limit

mm (in)

98.895 (3.8935039)

Installed clearance

mm (in)

0.011...0.035 
(0.000433...0.0013779)

Total wear clearance of piston and cylinder

mm (in)

0.12 (0.0047244)

Piston pin bore dia.

mm (in)

22.005...22.011 
(0.86634...0.866575)

Weight classes

+ and —

Weight difference in one class

g (oz.)

10 (0.35)
(complete with pins and 
rings)

Direction of installation

Arrow on piston crown 
pointing to exhaust side

Production location 
towards exhaust side 

a

(see Installing Piston)

Technical Data

R 1100 RS