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OEM Pistons Guide PDF Print E-mail
Written by Bob Ederer   
Saturday, 01 October 2005
OEM Pistons Guide
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

 

Image
Image
Image
Image
Image
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

COPYRIGHT 2002, BMW 2002 FAQ, Rob Shisler and Steve Kupper. All Rights Reserved.