|
Written by Bob Ederer
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Saturday, 01 October 2005 |
OEM Pistons Guide
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Compiled by
|
|
|
Model
|
1600
|
1800
|
1802
|
2000
|
2002
|
2002
tii
|
2002
tii
|
|
|
|
Cyl-Head
|
(118)
|
(121)
|
(e12)
|
(121)
|
(e12)
|
| Specifications |
Engine |
Unit
|
|
| Cylinders |
(from
introduction of standard piston) |
|
| Bore-original |
all
measures +/- 0.005mm Tol |
mm
|
84.015
|
89.015
|
| Bore-intermediate |
all
measures +/- 0.005mm Tol |
mm
|
84.095
|
89.095
|
| 1st
rebore |
all
measures +/- 0.005mm Tol |
mm
|
84.265
|
89.265
|
| 2nd
rebore |
all
measures +/- 0.005mm Tol |
mm
|
84.515
|
89.515
|
| Surface
roughness |
Rt
(um)
|
3
- 4 (.003-.004mm)
|
| Max.
permissible out-of-roundness of cyl bore |
mm
|
0.01
|
| Max.
permissible taper of cylinder bore |
mm
|
0.01
|
| Max.
permissible deviation of cylinder centre from bearing bore vertical |
5'
|
| Max.
permissible total wear play on piston and cylinder |
mm
|
0.10
- 0.15
|
|
Pistons
|
|
|
|
|
|
| Compression
ratio |
8.6:1
|
8.3:1
|
9.0:1
|
10.0:1
|
9.5:1
|
| Piston
length |
mm
|
85.5
|
92.2
|
80.3
|
84.6
|
84.9
|
86.9
|
| Compression
height + dome height |
mm
|
46.6
+ 5.7
|
46.6
+ 8.6
|
42.3
|
42.1
+ 4.5
|
42.5
+ 4.4
|
42.1 + 6.8
|
| Weight
groups |
stamped
+ or -
|
| Piston
pin category |
stamped
W or S
|
| Original
Piston-e |
A
mm
|
83.96
|
88.96
|
|
B
mm
|
83.97
|
88.97
|
|
C
mm
|
83.98
|
88.98
|
| Intermediate
size |
A
mm
|
84.04
|
89.04
|
|
B
mm
|
84.05
|
89.05
|
|
C
mm
|
84.06
|
89.06
|
| 1st
oversize +0.25mm |
A
mm
|
84.21
|
89.21
|
|
B
mm
|
84.22
|
89.22
|
|
C
mm
|
84.23
|
89.23
|
| 2nd
oversize +0.50mm |
A
mm
|
84.46
|
89.46
|
|
B
mm
|
84.47
|
89.47
|
|
C
mm
|
84.48
|
89.48
|
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