Difference between revisions of "Engine Specs - S65 Rod Bearings"

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Line 32: Line 32:
  
 
====Picture Description====
 
====Picture Description====
−
[[File:BMW 088-089 Eccentricity.jpg|thumb]]
+
[[File:BMW-RB-088-089.jpeg|600px]]
  
 
====Dimensions====
 
====Dimensions====
Line 333: Line 333:
  
 
'''Manufacturer:'''  Glyco.<br>'''Bearing composition:'''  Bimetal Aluminum<br>
 
'''Manufacturer:'''  Glyco.<br>'''Bearing composition:'''  Bimetal Aluminum<br>
 +
 +
====Picture Description====
 +
[[File:BMW-RB-702-703.jpg|600px]]
  
 
====Dimensions====
 
====Dimensions====
Line 651: Line 654:
 
'''Clevite TriArmor® coating'''
 
'''Clevite TriArmor® coating'''
 
For increased bearing life and durability, BE Bearings chose to add the Clevite TriArmor coating.  TriArmor is a low-friction coating offered directly from Clevite with a Clevite warranty.  It's ideally suited for start-stop engines and protects the crankshaft and bearings at critical times of low oil pressure and/or during start up.<br>
 
For increased bearing life and durability, BE Bearings chose to add the Clevite TriArmor coating.  TriArmor is a low-friction coating offered directly from Clevite with a Clevite warranty.  It's ideally suited for start-stop engines and protects the crankshaft and bearings at critical times of low oil pressure and/or during start up.<br>
 +
 +
====Picture Description====
 +
=====Standard (STD)=====
 +
[[File:BEB-SP1527HK.jpeg|600px]]
 +
=====+0.025 MM, +0.001 INCH=====
 +
[[File:BEB-SP1527HK+025MM.jpg|600px]]
  
 
====Dimensions====
 
====Dimensions====
 +
=====Standard (STD)=====
 
{| class = "diyTable bearingSpec"
 
{| class = "diyTable bearingSpec"
 
   !Bearing Dimensions (BE Bearings Bearings)
 
   !Bearing Dimensions (BE Bearings Bearings)
Line 667: Line 677:
 
   |1.9812 - 1.9914 mm
 
   |1.9812 - 1.9914 mm
 
   |0.07800 - 0.07840 inch
 
   |0.07800 - 0.07840 inch
 +
 +
|-
 +
  |Bearing Tolerance (Top=Bottom)
 +
  |<nowiki>-0.0051 - 0.0051 mm</nowiki>
 +
  |<nowiki>-0.00020 - +0.00020 inch</nowiki>
 +
|}
 +
 +
=====+0.025 MM, +0.001 INCH=====
 +
{| class = "diyTable bearingSpec"
 +
  !Bearing Dimensions (BE Bearings Bearings)
 +
  !Metric Dimensions
 +
  !SAE (Inch) Dimensions
 +
 +
|-
 +
  |Nominal Bearing Thickness (Top=Bottom)
 +
  |2.0003 mm
 +
  |0.07875 inch
 +
 +
|-
 +
  |Bearing Thickness Variance (Top=Bottom)
 +
  |1.9952 - 2.0053 mm
 +
  |0.07855 - 0.07895 inch
 
   
 
   
 
  |-
 
  |-
Line 930: Line 962:
 
[[File:BEB_SP1527HK_Eccentricity.jpg|600px]]<br>
 
[[File:BEB_SP1527HK_Eccentricity.jpg|600px]]<br>
 
Bearing Eccentricity:  BE Bearings vs. stock 088/089 vs. stock 702/703 rod bearings
 
Bearing Eccentricity:  BE Bearings vs. stock 088/089 vs. stock 702/703 rod bearings
 +
<br>
 +
 +
===ACL Bearings===
 +
 +
ACL Race Bearing Catalog:  http://www.aclperformance.com.au/documents/56469_RaceSeriesInfo.pdf<br>
 +
BE Bearings Photo Blog:  http://www.rcollins-home.org/photobucket/thumbnails.php?album=278<br>
 +
 +
====Production and Composition====
 +
'''Manufacturer:  '''ACL<br>
 +
'''Composition:'''  Trimetal lead/copper<br>
 +
'''Coating:'''  None<br>
 +
'''Part Number:  '''8B1580H (STD), 8B1580HX (+0.25 mm)<br>
 +
'''Target Market:  '''OEM replacement market; Minimal increase in clearance over OEM rod bearings
 +
 +
ACL Bearings are a full custom rod bearing designed and manufactured by ACL.  ACL manufactures the bearings to their own custom specifications.
 +
 +
The composition is a standard lead/copper bearing. The bearing does not contain a low-friction coating.
 +
 +
'''Set Numbering'''
 +
ACL RACE Series bearing sets are identified by the ‘H’ after the set
 +
number e.g. 8B663H-Std.
 +
Most ACL RACE Series bearings are also produced in a ‘HX’ version
 +
e.g. 8B663HX-Std. The ‘X’ signifies the set will give an extra .001”
 +
(.025mm) oil clearance on a standard size shaft when compared to
 +
the H-STD set. The wall size of these HX-STD bearings is .0005”
 +
(.013mm) thinner than the H-STD Bearings, in all other respects the
 +
HX set is identical to the H-STD set.
 +
There are selected con rod bearing sets that are manufactured with
 +
a dowel hole in the lower shell, to suit a dowel location in the con
 +
rod cap. These are designated with a ‘D’ in the set numbering e.g.
 +
8B663HD-Std or 8B663HXD-Std etc.
 +
 +
'''Lead/Copper, Tri-Metal design'''
 +
Tri-Metal, lead/copper are considered the world's best bearings.  The steel backing is coated with copper, then topped with a soft lead.  The lead is embeddable, meaning small particles can embed themselves in the lead without causing any damage to the crankshaft.  Look in the best automotive engines, and you're likely to find a Tri-Metal bearing design.<br>
 +
 +
'''Oil Clearances'''
 +
Oil clearances are most accurately measured using micrometres and
 +
bore gauges. Bearing wall thickness measurements are taken at 90
 +
degrees to the parting line (i.e. at the crown of the bearing) using a
 +
micrometre with a ball anvil, for use on the curved ID of the bearing.<br>
 +
 +
Vertical oil clearance is best measured by assembling the bearing in its
 +
housing, with bolts torqued to specification, then using a bore gauge
 +
measure the assembled ID of the bearings at 90 degrees to the parting
 +
faces. The mating crankshaft journal size is measured, and subtracting
 +
this measurement from the bearing ID bore size, gives the assembled
 +
oil clearance.<br>
 +
 +
ACL RACE bearings can be assembled with .00075-.001” per 1” of
 +
journal diameter (0.020-0.025mm per 25mm of journal diameter) plus
 +
.0005” (0.013mm).<br>
 +
 +
As an example for a 2.000” (50mm) journal diameter, 2.000 x .001=
 +
.002 + .0005 = .0025” (50/25 x 0.025= 0.050 + .013 = 0.063 mm)
 +
Bearings should not be polished with abrasive pads or paper, on the
 +
bearing surface, to change the oil clearance.<br>
 +
 +
====Picture Description====
 +
 +
Questions about the appearance of the RACE Series bearings are
 +
quite common, as this series of trimetal copper lead bearings have
 +
a very different appearance to regular aftermarket “ACL Duraglide”
 +
trimetal bearings, which have a light silver /grey appearance.<br>
 +
 +
The RACE Series performance bearings as manufactured have
 +
an appearance that is a dark tarnished colouration, which can
 +
vary from dark black/brown/blue colours. This colour comes from
 +
the electroplating which is the last manufacturing process. The
 +
electroplated overlay has copper as one part of its composition, which
 +
tarnishes to the dark colours described above. This tarnish colouration
 +
has negligible thickness, so once installed in the engine, the crankshaft
 +
journal contacting the bearing, will polish the bearing surface, removing
 +
the surface colour and leaving the bearings with a polished silver
 +
appearance.<br>
 +
 +
Performance bearings do not start out with the silver grey appearance
 +
of regular aftermarket bearings, as there is no final silvery tin flash
 +
applied to these bearings. Not applying a silvery tin flash to these high
 +
performance bearings is a specific design feature. A silvery tin flash
 +
for appearance and long term corrosion protection, as applied to the
 +
regular aftermarket bearings, can under high loading and heat, move,
 +
with the plate migrating and causing high spots on the back of the
 +
shells, and distorting the bearing. For this reason the ACL RACE Series
 +
performance bearings do not have a cosmetic silvery tin flash applied,
 +
so there is no risk of any overlay plate movement on the backs of the
 +
shells, giving better bearing to housing contact and better bearing
 +
performance and function.
 +
 +
=====Standard (STD)=====
 +
[[File:ACL PartNum.JPG|600px]]
 +
 +
=====+0.250 MM, +0.010 INCH=====
 +
[[File:ACL+025 PartNum.jpg|600px]]
 +
 +
====Dimensions====
 +
=====Standard (STD)=====
 +
{| class = "diyTable bearingSpec"
 +
  !Bearing Dimensions (ACL Bearings)
 +
  !Metric Dimensions
 +
  !SAE (Inch) Dimensions
 +
 +
|-
 +
  |Nominal Bearing Thickness (Top=Bottom)
 +
  |1.9889 mm
 +
  |0.07870 inch
 +
 +
|-
 +
  |Bearing Thickness Variance (Top=Bottom)
 +
  |1.9939 - 2.0003 mm
 +
  |0.07850 - 0.07875 inch
 +
 +
|-
 +
  |Bearing Tolerance (Top=Bottom)
 +
  |<nowiki>-0.0031 - 0.0033 mm</nowiki>
 +
  |<nowiki>-0.00012 - +0.00013 inch</nowiki>
 +
|}
 +
 +
=====+0.250 MM, +0.010 INCH=====
 +
{| class = "diyTable bearingSpec"
 +
  !Bearing Dimensions (ACL Bearings)
 +
  !Metric Dimensions
 +
  !SAE (Inch) Dimensions
 +
 +
|-
 +
  |Nominal Bearing Thickness (Top=Bottom)
 +
  |2.1209 mm
 +
  |0.08350 inch
 +
 +
|-
 +
  |Bearing Thickness Variance (Top=Bottom)
 +
  |2.1184 - 2.1247 mm
 +
  |0.08340 - 0.08365 inch
 +
 +
|-
 +
  |Bearing Tolerance (Top=Bottom)
 +
  |<nowiki>-0.0013 - 0.0038 mm</nowiki>
 +
  |<nowiki>-0.00005 - +0.00015 inch</nowiki>
 +
|}
 +
<br>
 +
 +
====Bearing Clearance Specifications (STD)====
 +
{| class = "diyTable bearingSpec"
 +
  !ACL Bearings (ACL) Custom Rod Bearings
 +
  !Metric Dimensions
 +
  !SAE (Inch) Dimensions
 +
 +
|-
 +
  |Rod + Bearing Dimensions
 +
  |52.0333 mm
 +
  |2.04856 inch
 +
 +
|-
 +
  |Rod + Bearing Variance
 +
  |52.0444 -  52.0446 mm
 +
  |2.04860 - 2.04900 inch
 +
 +
|-
 +
  |Nominal Rod Bearing Clearance
 +
  |0.0508 mm
 +
  |0.00200 inch
 +
 +
|-
 +
  |Bearing Clearance Variance
 +
  |0.0406 - 0.0660 mm
 +
  |0.00160 - 0.00260 inch
 +
 +
|-
 +
  |Bearing Clearance Tolerance
 +
  |<nowiki>-0.0102 - +0.0152 mm</nowiki>
 +
  |<nowiki>-0.00040 - +0.00060 inch</nowiki>
 +
 +
|-
 +
  |Bearing Clearance per Journal inch
 +
  | 
 +
  |0.00097 inch/inch
 +
 +
|-
 +
  |Bearing Clearance per Journal Inch Variance
 +
  |
 +
  |0.00078 - 0.00127 inch/inch
 +
 +
|-
 +
  |Bearing Eccentricity
 +
  |0.0533 mm
 +
  |0.00210 inch
 +
 +
|-
 +
  |Bearing Eccentricity Variance
 +
  |0.0203 - 0.0762 mm
 +
  |0.00080 - 0.00300 inch
 +
 +
|-
 +
  |Bearing Eccentricity Tolerance
 +
  |<nowiki>-0.0737 - +0.0229 mm</nowiki>
 +
  |<nowiki>-0.00290 - +0.00090 inch</nowiki>
 +
|}
 +
<p></p>
 +
 +
====Clearance Measurements====
 +
{| class = "diyTable supportData rodBearings"
 +
  !Angle
 +
  !Rod-1
 +
  !Rod-2
 +
  !Rod-3
 +
  !Rod-4
 +
  !Rod-5
 +
  !Rod-6
 +
  !Rod-7
 +
  !Rod-8
 +
 +
|-
 +
  |5.00
 +
  |2.05220
 +
  |2.05225
 +
  |2.05320
 +
  |2.05280
 +
  |2.05105
 +
  |2.05245
 +
  |2.05115
 +
  |2.05315
 +
 +
|-
 +
  |19.75
 +
  |2.04985
 +
  |2.05060
 +
  |2.05050
 +
  |2.05050
 +
  |2.05015
 +
  |2.05050
 +
  |2.05020
 +
  |2.05100
 +
 +
|-
 +
  |45.00
 +
  |2.04885
 +
  |2.04900
 +
  |2.04900
 +
  |2.04900
 +
  |2.04920
 +
  |2.04920
 +
  |2.04920
 +
  |2.04940
 +
 +
|-
 +
  |90.00
 +
  |2.04850
 +
  |2.04850
 +
  |2.04840
 +
  |2.04840
 +
  |2.04875
 +
  |2.04840
 +
  |2.04865
 +
  |2.04855
 +
 +
|-
 +
  |135.00
 +
  |2.04920
 +
  |2.04840
 +
  |2.04900
 +
  |2.04940
 +
  |2.04940
 +
  |2.04900
 +
  |2.04930
 +
  |2.04925
 +
 +
|-
 +
  |160.25
 +
  |2.05060
 +
  |2.05040
 +
  |2.05020
 +
  |2.05060
 +
  |2.05060
 +
  |2.05060
 +
  |2.05020
 +
  |2.05055
 +
 +
|-
 +
  |175.00
 +
  |2.05150
 +
  |2.05205
 +
  |2.05100
 +
  |2.05200
 +
  |2.05280
 +
  |2.05210
 +
  |2.05240
 +
  |2.05120
 +
 +
|-
 +
  |Clearance
 +
  |0.00200
 +
  |0.00200
 +
  |0.00190
 +
  |0.00190
 +
  |0.00225
 +
  |0.00190
 +
  |0.00215
 +
  |0.00205
 +
 +
|}
 +
 +
'''Note:  '''Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.
 +
<br>
 +
 +
====Eccentricity Measurements====
 +
{| class = "diyTable supportData rodBearings"
 +
  !Angle
 +
  !Rod-1
 +
  !Rod-2
 +
  !Rod-3
 +
  !Rod-4
 +
  !Rod-5
 +
  !Rod-6
 +
  !Rod-7
 +
  !Rod-8
 +
 +
|-
 +
  |5.00
 +
  |0.00370
 +
  |0.00375
 +
  |0.00480
 +
  |0.00440
 +
  |0.00230
 +
  |0.00405
 +
  |0.00250
 +
  |0.00460
 +
 +
|-
 +
  |19.75
 +
  |0.00135
 +
  |0.00210
 +
  |0.00210
 +
  |0.00210
 +
  |0.00140
 +
  |0.00210
 +
  |0.00155
 +
  |0.00245
 +
 +
|-
 +
  |45.00
 +
  |0.00035
 +
  |0.00050
 +
  |0.00060
 +
  |0.00060
 +
  |0.00045
 +
  |0.00080
 +
  |0.00055
 +
  |0.00085
 +
 +
|-
 +
  |90.00
 +
  |0.00000
 +
  |0.00000
 +
  |0.00000
 +
  |0.00000
 +
  |0.00000
 +
  |0.00000
 +
  |0.00000
 +
  |0.00000
 +
 +
|-
 +
  |135.00
 +
  |0.00070
 +
  |<nowiki>-0.00010</nowiki>
 +
  |0.00060
 +
  |0.00100
 +
  |0.00065
 +
  |0.00060
 +
  |0.00065
 +
  |0.00070
 +
 +
|-
 +
  |160.25
 +
  |0.00210
 +
  |0.00190
 +
  |0.00180
 +
  |0.00220
 +
  |0.00185
 +
  |0.00220
 +
  |0.00155
 +
  |0.00200
 +
 +
|-
 +
  |175.00
 +
  |0.00300
 +
  |0.00355
 +
  |0.00260
 +
  |0.00360
 +
  |0.00405
 +
  |0.00370
 +
  |0.00375
 +
  |0.00265
 +
|}
 +
<br>
 +
[[File:ACL Eccentricity.jpg|600px]]<br>
 +
Bearing Eccentricity:  ACL Bearings vs. stock 702/703 rod bearings
 
<br>
 
<br>
  
Line 943: Line 1,370:
  
 
The composition is a standard babbit lead/copper bearing with additional Calico non-friction coating. They are soft faced, and easy on the crankshaft, and compatible with stop-start vehicles.
 
The composition is a standard babbit lead/copper bearing with additional Calico non-friction coating. They are soft faced, and easy on the crankshaft, and compatible with stop-start vehicles.
 +
 +
====Picture Description====
 +
[[File:VAC-SP1512HX.jpg|600px]]
  
 
====Dimensions====
 
====Dimensions====

Revision as of 17:52, 11 July 2018


Contents

Rod Journal Dimensions

Crankshaft Rod Journals Metric Dimensions SAE (Inch) Dimensions
Rod Journal Dimensions 51.9811mm 2.04650 inch
Rod Journal Variance 51.9786 - 51.9887 mm 2.04640 - 2.04680 inch
Rod Journal Tolerance -0.0025, +0.0076 mm -0.00010, +0.00030 inch

Bearings Specification, Dimensions, Clearance

OEM 088/089 Bearings

Production and Composition

BMW "088/089" bearings were the factory production bearings between 2007 to mid-2010. When the EU mandated the removal from lead in automotive bearings, BMW discontinued these bearings.

The composition is a standard babbit lead/copper bearing. They are soft faced, and easy on the crankshaft.

Manufacturer: Clevite. Clevite logo is seen on the back of the bearings.
Composition: Trimetal lead/copper

Picture Description

BMW-RB-088-089.jpeg

Dimensions

Bearing Dimensions (088/089 Bearings) Metric Dimensions SAE (Inch) Dimensions
Nominal Bearing Thickness (Top, Blue) 2.0028 mm 0.07885 inch
Nominal Bearing Thickness (Bottom, Red) 1.9977 mm 0.07865 inch
Bearing Thickness Variance (Top, Blue) 2.0015 - 2.0041 mm 0.07880 - 0.07890 inch
Bearing Thickness Variance (Bottom, Red) 1.9964 - 2.0015 mm 0.07860 - 0.07880 inch
Bearing Tolerance (Top, Blue) -0.0013 - 0.0013 mm -0.00005 - +0.00005 inch
Bearing Tolerance (Bottom, Red) -0.0013 - 0.0038 mm -0.00005 - +0.00015 inch


Bearing Clearance Specifications

Con Rod Clearance (088/089 Bearings) [* 1] Metric Dimensions SAE (Inch) Dimensions
Rod + Bearing Dimensions 52.0179 mm 2.04795 inch
Rod + Bearing Variance [* 1] 52.0154 - 52.0192 mm 2.04785 - 2.04800 inch
Nominal Rod Bearing Clearance 0.0368 mm 0.00145 inch
Bearing Clearance Variance [* 1] 0.0267 - 0.0406 mm 0.00105 - 0.00160 inch
Bearing Clearance Tolerance -0.0102 - +0.0038 mm -0.00040 - +0.00015 inch
Bearing Clearance per Journal inch   0.00071 inch/inch
Bearing Clearance per Journal Inch Variance [* 1] 0.00066 - 0.00073 inch/inch
Bearing Eccentricity 0.0216 mm 0.00085 inch
Bearing Eccentricity Variance 0.0178 - 0.0229 mm 0.00070 - 0.00090 inch
Bearing Eccentricity Tolerance -0.0038 - +0.0013 mm -0.00015 - +0.00005 inch


Clearance Measurements

Angle Rod-1 Rod-2 Rod-3 Rod-4 Rod-5 Rod-6 Rod-7 Rod-8
5.00 2.05070 2.05040 2.05035 2.05055 2.05060 2.05050 2.05035 2.05050
19.75 2.04860 2.04860 2.04880 2.04880 2.04880 2.04885 2.04885 2.04885
45.00 2.04815 2.04800 2.04840 2.04815 2.04830 2.04805 2.04835 2.04830
90.00 2.04785 2.04790 2.04795 2.04795 2.04800 2.04795 2.04800 2.04800
135.00 2.04800 2.04820 2.04820 2.04840 2.04820 2.04810 2.04840 2.04820
160.25 2.04860 2.04860 2.04880 2.04870 2.04885 2.04880 2.04870 2.04885
175.00 2.05060 2.05100 2.05035 2.05060 2.05055 2.05015 2.05050 2.05055
Clearance 0.00135 0.00140 0.00145 0.00145 0.00150 0.00145 0.00150 0.00150

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

Eccentricity Measurements

Angle Rod-1 Rod-2 Rod-3 Rod-4 Rod-5 Rod-6 Rod-7 Rod-8
5.00 0.00285 0.00250 0.00240 0.00260 0.00260 0.00255 0.00235 0.00250
19.75 0.00075 0.00070 0.00085 0.00085 0.00080 0.00090 0.00085 0.00085
45.00 0.00030 0.00010 0.00045 0.00020 0.00030 0.00010 0.00035 0.00030
90.00 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
135.00 0.00015 0.00030 0.00025 0.00045 0.00020 0.00015 0.00040 0.00020
160.25 0.00075 0.00070 0.00085 0.00075 0.00085 0.00085 0.00070 0.00085
175.00 0.00275 0.00310 0.00240 0.00265 0.00255 0.00220 0.00250 0.00255


BMW 088-089 Eccentricity.jpg
Bearing Eccentricity: BMW Factory 088/089 rod bearings

OEM 702/703 Bearings

Production and Composition

EU mandates against lead/copper bearings began in 2011. However, S65 engines have been seen with mid-2010 production dates having these newer 702/703 bearings. These bearings remained in production until the end of S65 production in 2013.

The new 702/703 bearings are made from tin/aluminum composition. BMW increased the clearance slightly over the 088/089 bearings and increased the eccentricity as well. But this improvement in clearance and eccentricity came at a price. The 702/703 bearings are substantially harder than the 088/089 bearings they replaced. As a consequence, when a bearing is spun, it tends to cause more damage to the crankshaft in the process.

Manufacturer: Glyco.
Bearing composition: Bimetal Aluminum

Picture Description

BMW-RB-702-703.jpg

Dimensions

Bearing Dimensions (702/703 Bearings) Metric Dimensions SAE (Inch) Dimensions
Nominal Bearing Thickness (Top, Blue) 1.9977 mm 0.07865 inch
Nominal Bearing Thickness (Bottom, Red) 1.9939 mm 0.07850 inch
Bearing Thickness Variance (Top, Blue) 1.9977 - 1.9990 mm 0.07865 - 0.07870 inch
Bearing Thickness Variance (Bottom, Red) 1.9939 - 1.9952 mm 0.07850 - 0.07855 inch
Bearing Tolerance (Top, Blue) 0.0000 - 0.0013 mm 0.00000 - +0.00005 inch
Bearing Tolerance (Bottom, Red) 0.0000 - 0.0013 mm 0.00000 - +0.00005 inch


Bearing Clearance Specifications

Con Rod Clearance (702/703 Bearings) Metric Dimensions SAE (Inch) Dimensions
Rod + Bearing Dimensions 52.0243 mm 2.04820 inch
Rod + Bearing Variance 52.0230 - 52.0294 mm 2.04815 - 2.04840 inch
Nominal Rod Bearing Clearance 0.0432 mm 0.00170 inch
Bearing Clearance Variance 0.0343 - 0.0508 mm 0.00135 - 0.00200 inch
Bearing Clearance Tolerance -0.0089 - +0.0076 mm -0.00035 - +0.00030 inch
Bearing Clearance per Journal inch   0.00083 inch/inch
Bearing Clearance per Journal Inch Variance 0.00081 - 0.00093 inch/inch
Bearing Eccentricity 0.0508 mm 0.00200 inch
Bearing Eccentricity Variance 0.0444 - 0.0584 mm 0.00175 - 0.00230 inch
Bearing Eccentricity Tolerance -0.0063 - +0.0076 mm -0.00025 - +0.00030 inch


Clearance Measurements

Angle Rod-1 Rod-2 Rod-3 Rod-4 Rod-5 Rod-6 Rod-7 Rod-8
5.00 2.05280 2.05290 2.05290 2.05280 2.05250 2.05260 2.05270 2.05290
19.75 2.05045 2.05035 2.05035 2.05020 2.05010 2.05020 2.05035 2.05035
45.00 2.04900 2.04880 2.04880 2.04920 2.04870 2.04890 2.04880 2.04890
90.00 2.04830 2.04815 2.04840 2.04820 2.04835 2.04830 2.04820 2.04820
135.00 2.04900 2.04890 2.04900 2.04885 2.04900 2.04890 2.04890 2.04885
160.25 2.05035 2.05045 2.05035 2.05020 2.05040 2.05040 2.05035 2.05020
175.00 2.05280 2.05300 2.05270 2.05280 2.05285 2.05290 2.05285 2.05300
Clearance 0.00180 0.00165 0.00190 0.00170 0.00185 0.00180 0.00170 0.00170

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

Eccentricity Measurements

Angle Rod-1 Rod-2 Rod-3 Rod-4 Rod-5 Rod-6 Rod-7 Rod-8
5.00 0.00450 0.00475 0.00450 0.00460 0.00415 0.00430 0.00450 0.00470
19.75 0.00215 0.00220 0.00195 0.00200 0.00175 0.00190 0.00215 0.00215
45.00 0.00070 0.00065 0.00040 0.00100 0.00035 0.00060 0.00060 0.00070
90.00 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
135.00 0.00070 0.00075 0.00060 0.00065 0.00065 0.00060 0.00070 0.00065
160.25 0.00205 0.00230 0.00195 0.00200 0.00205 0.00210 0.00215 0.00200
175.00 0.00450 0.00485 0.00430 0.00460 0.00450 0.00460 0.00465 0.00480


BMW 702-703 Eccentricity.jpg
Bearing Eccentricity: BMW Factory 702/703 rod bearings

BE Bearings

Production and Composition

Manufacturer: Clevite
Composition: Trimetal lead/copper
Coating: Clevite TriArmor®
Part Number: SP1527HK
Target Market: Extra clearance OEM replacement

BE Bearings are a full custom rod bearing designed and manufactured by Clevite. Clevite manufactures the bearings to the BE Bearing specifications.

The composition is a standard babbit lead/copper bearing with additional Clevite Tri-Armor non-friction coating. They are soft faced, and easy on the crankshaft, and compatible with stop-start vehicles.

Lead/Copper, Tri-Metal design Tri-Metal, lead/copper are considered the world's best bearings.  The steel backing is coated with copper, then topped with a soft lead.  The lead is embeddable, meaning small particles can embed themselves in the lead without causing any damage to the crankshaft.  Look in the best automotive engines, and you're likely to find a Tri-Metal bearing design.

Used Oil Analysis (UOA) BE Bearings chose the Tri-Metal lead/copper bearings to track the metals in the UOA like Blackstone.  Owners with 2008-2010.5 vehicles still have the lead/copper bearings and can track their bearing life with the UOA.  The newer tin/aluminum BMW bearings are virtually untrackable in the UOA.  BE Bearings wanted their bearings to show up in the UOA, and another reason they chose the Tri-Metal, lead/copper design.

Factory BMW oil recommendations There's a lot of discussion about the best for the S65/S85.  BMW specified 10W60 weight oil, and many people believe this is too thick for the bearing clearances.  Others believe BMW chose it for a specific engineering reason and refuse to switch regardless of the too-thin oil clearance.  For better peace of mind, BE Bearings wanted their bearing owners to know they can safely use 10W60 oil with their bearings, just as BMW had specified in the first place.

Clevite TriArmor® coating For increased bearing life and durability, BE Bearings chose to add the Clevite TriArmor coating.  TriArmor is a low-friction coating offered directly from Clevite with a Clevite warranty.  It's ideally suited for start-stop engines and protects the crankshaft and bearings at critical times of low oil pressure and/or during start up.

Picture Description

Standard (STD)

BEB-SP1527HK.jpeg

+0.025 MM, +0.001 INCH

BEB-SP1527HK+025MM.jpg

Dimensions

Standard (STD)
Bearing Dimensions (BE Bearings Bearings) Metric Dimensions SAE (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom) 1.9863 mm 0.07820 inch
Bearing Thickness Variance (Top=Bottom) 1.9812 - 1.9914 mm 0.07800 - 0.07840 inch
Bearing Tolerance (Top=Bottom) -0.0051 - 0.0051 mm -0.00020 - +0.00020 inch
+0.025 MM, +0.001 INCH
Bearing Dimensions (BE Bearings Bearings) Metric Dimensions SAE (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom) 2.0003 mm 0.07875 inch
Bearing Thickness Variance (Top=Bottom) 1.9952 - 2.0053 mm 0.07855 - 0.07895 inch
Bearing Tolerance (Top=Bottom) -0.0051 - 0.0051 mm -0.00020 - +0.00020 inch


Bearing Clearance Specifications

BE Bearings (Clevite) Custom Rod Bearings Metric Dimensions SAE (Inch) Dimensions
Rod + Bearing Dimensions 52.0413 mm 2.04887 inch
Rod + Bearing Variance 52.0413 mm 2.04860 - 2.04920 inch
Nominal Rod Bearing Clearance 0.0610 mm 0.00240 inch
Bearing Clearance Variance 0.0457 - 0.0711 mm 0.00180 - 0.00280 inch
Bearing Clearance Tolerance -0.0152 - +0.0102 mm -0.00060 - +0.00040 inch
Bearing Clearance per Journal inch   0.00116 inch/inch
Bearing Clearance per Journal Inch Variance 0.00103 - 0.00132 inch/inch
Bearing Eccentricity 0.0419 mm 0.00165 inch
Bearing Eccentricity Variance 0.0229 - 0.0483 mm 0.00090 - 0.00190 inch
Bearing Eccentricity Tolerance -0.0191 - +0.0063 mm -0.00075 - +0.00025 inch

Clearance Measurements

Angle Rod-1 Rod-2 Rod-3 Rod-4 Rod-5 Rod-6 Rod-7 Rod-8
5.00 2.05280 2.05200 2.05305 2.05190 2.05270 2.05290 2.05235 2.05225
19.75 2.05050 2.05040 2.05030 2.05030 2.05070 2.05055 2.05065 2.05025
45.00 2.04930 2.04910 2.04920 2.04935 2.04965 2.04940 2.04965 2.04940
90.00 2.04860 2.04885 2.04870 2.04900 2.04920 2.04875 2.04900 2.04885
135.00 2.04900 2.04930 2.04920 2.04940 2.04910 2.04910 2.04930 2.04920
160.25 2.05010 2.05050 2.05045 2.05065 2.05010 2.05010 2.05000 2.05005
175.00 2.05315 2.05205 2.05280 2.05290 2.05260 2.05270 2.05250 2.05190
Clearance 0.00210 0.00235 0.00220 0.00250 0.00270 0.00225 0.00250 0.00235

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

Eccentricity Measurements

Angle Rod-1 Rod-2 Rod-3 Rod-4 Rod-5 Rod-6 Rod-7 Rod-8
5.00 0.00420 0.00315 0.00435 0.00290 0.00350 0.00415 0.00335 0.00340
19.75 0.00190 0.00155 0.00160 0.00130 0.00150 0.00180 0.00165 0.00140
45.00 0.00070 0.00025 0.00050 0.00035 0.00045 0.00065 0.00065 0.00055
90.00 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
135.00 0.00040 0.00045 0.00050 0.00040 -0.00010 0.00035 0.00030 0.00035
160.25 0.00150 0.00165 0.00175 0.00165 0.00090 0.00135 0.00100 0.00120
175.00 0.00455 0.00320 0.00410 0.00390 0.00340 0.00395 0.00350 0.00305


BEB SP1527HK Eccentricity.jpg
Bearing Eccentricity: BE Bearings vs. stock 088/089 vs. stock 702/703 rod bearings

ACL Bearings

ACL Race Bearing Catalog: http://www.aclperformance.com.au/documents/56469_RaceSeriesInfo.pdf
BE Bearings Photo Blog: http://www.rcollins-home.org/photobucket/thumbnails.php?album=278

Production and Composition

Manufacturer: ACL
Composition: Trimetal lead/copper
Coating: None
Part Number: 8B1580H (STD), 8B1580HX (+0.25 mm)
Target Market: OEM replacement market; Minimal increase in clearance over OEM rod bearings

ACL Bearings are a full custom rod bearing designed and manufactured by ACL. ACL manufactures the bearings to their own custom specifications.

The composition is a standard lead/copper bearing. The bearing does not contain a low-friction coating.

Set Numbering ACL RACE Series bearing sets are identified by the ‘H’ after the set number e.g. 8B663H-Std. Most ACL RACE Series bearings are also produced in a ‘HX’ version e.g. 8B663HX-Std. The ‘X’ signifies the set will give an extra .001” (.025mm) oil clearance on a standard size shaft when compared to the H-STD set. The wall size of these HX-STD bearings is .0005” (.013mm) thinner than the H-STD Bearings, in all other respects the HX set is identical to the H-STD set. There are selected con rod bearing sets that are manufactured with a dowel hole in the lower shell, to suit a dowel location in the con rod cap. These are designated with a ‘D’ in the set numbering e.g. 8B663HD-Std or 8B663HXD-Std etc.

Lead/Copper, Tri-Metal design Tri-Metal, lead/copper are considered the world's best bearings.  The steel backing is coated with copper, then topped with a soft lead.  The lead is embeddable, meaning small particles can embed themselves in the lead without causing any damage to the crankshaft.  Look in the best automotive engines, and you're likely to find a Tri-Metal bearing design.

Oil Clearances Oil clearances are most accurately measured using micrometres and bore gauges. Bearing wall thickness measurements are taken at 90 degrees to the parting line (i.e. at the crown of the bearing) using a micrometre with a ball anvil, for use on the curved ID of the bearing.

Vertical oil clearance is best measured by assembling the bearing in its housing, with bolts torqued to specification, then using a bore gauge measure the assembled ID of the bearings at 90 degrees to the parting faces. The mating crankshaft journal size is measured, and subtracting this measurement from the bearing ID bore size, gives the assembled oil clearance.

ACL RACE bearings can be assembled with .00075-.001” per 1” of journal diameter (0.020-0.025mm per 25mm of journal diameter) plus .0005” (0.013mm).

As an example for a 2.000” (50mm) journal diameter, 2.000 x .001= .002 + .0005 = .0025” (50/25 x 0.025= 0.050 + .013 = 0.063 mm) Bearings should not be polished with abrasive pads or paper, on the bearing surface, to change the oil clearance.

Picture Description

Questions about the appearance of the RACE Series bearings are quite common, as this series of trimetal copper lead bearings have a very different appearance to regular aftermarket “ACL Duraglide” trimetal bearings, which have a light silver /grey appearance.

The RACE Series performance bearings as manufactured have an appearance that is a dark tarnished colouration, which can vary from dark black/brown/blue colours. This colour comes from the electroplating which is the last manufacturing process. The electroplated overlay has copper as one part of its composition, which tarnishes to the dark colours described above. This tarnish colouration has negligible thickness, so once installed in the engine, the crankshaft journal contacting the bearing, will polish the bearing surface, removing the surface colour and leaving the bearings with a polished silver appearance.

Performance bearings do not start out with the silver grey appearance of regular aftermarket bearings, as there is no final silvery tin flash applied to these bearings. Not applying a silvery tin flash to these high performance bearings is a specific design feature. A silvery tin flash for appearance and long term corrosion protection, as applied to the regular aftermarket bearings, can under high loading and heat, move, with the plate migrating and causing high spots on the back of the shells, and distorting the bearing. For this reason the ACL RACE Series performance bearings do not have a cosmetic silvery tin flash applied, so there is no risk of any overlay plate movement on the backs of the shells, giving better bearing to housing contact and better bearing performance and function.

Standard (STD)

ACL PartNum.JPG

+0.250 MM, +0.010 INCH

ACL+025 PartNum.jpg

Dimensions

Standard (STD)
Bearing Dimensions (ACL Bearings) Metric Dimensions SAE (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom) 1.9889 mm 0.07870 inch
Bearing Thickness Variance (Top=Bottom) 1.9939 - 2.0003 mm 0.07850 - 0.07875 inch
Bearing Tolerance (Top=Bottom) -0.0031 - 0.0033 mm -0.00012 - +0.00013 inch
+0.250 MM, +0.010 INCH
Bearing Dimensions (ACL Bearings) Metric Dimensions SAE (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom) 2.1209 mm 0.08350 inch
Bearing Thickness Variance (Top=Bottom) 2.1184 - 2.1247 mm 0.08340 - 0.08365 inch
Bearing Tolerance (Top=Bottom) -0.0013 - 0.0038 mm -0.00005 - +0.00015 inch


Bearing Clearance Specifications (STD)

ACL Bearings (ACL) Custom Rod Bearings Metric Dimensions SAE (Inch) Dimensions
Rod + Bearing Dimensions 52.0333 mm 2.04856 inch
Rod + Bearing Variance 52.0444 - 52.0446 mm 2.04860 - 2.04900 inch
Nominal Rod Bearing Clearance 0.0508 mm 0.00200 inch
Bearing Clearance Variance 0.0406 - 0.0660 mm 0.00160 - 0.00260 inch
Bearing Clearance Tolerance -0.0102 - +0.0152 mm -0.00040 - +0.00060 inch
Bearing Clearance per Journal inch   0.00097 inch/inch
Bearing Clearance per Journal Inch Variance 0.00078 - 0.00127 inch/inch
Bearing Eccentricity 0.0533 mm 0.00210 inch
Bearing Eccentricity Variance 0.0203 - 0.0762 mm 0.00080 - 0.00300 inch
Bearing Eccentricity Tolerance -0.0737 - +0.0229 mm -0.00290 - +0.00090 inch

Clearance Measurements

Angle Rod-1 Rod-2 Rod-3 Rod-4 Rod-5 Rod-6 Rod-7 Rod-8
5.00 2.05220 2.05225 2.05320 2.05280 2.05105 2.05245 2.05115 2.05315
19.75 2.04985 2.05060 2.05050 2.05050 2.05015 2.05050 2.05020 2.05100
45.00 2.04885 2.04900 2.04900 2.04900 2.04920 2.04920 2.04920 2.04940
90.00 2.04850 2.04850 2.04840 2.04840 2.04875 2.04840 2.04865 2.04855
135.00 2.04920 2.04840 2.04900 2.04940 2.04940 2.04900 2.04930 2.04925
160.25 2.05060 2.05040 2.05020 2.05060 2.05060 2.05060 2.05020 2.05055
175.00 2.05150 2.05205 2.05100 2.05200 2.05280 2.05210 2.05240 2.05120
Clearance 0.00200 0.00200 0.00190 0.00190 0.00225 0.00190 0.00215 0.00205

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

Eccentricity Measurements

Angle Rod-1 Rod-2 Rod-3 Rod-4 Rod-5 Rod-6 Rod-7 Rod-8
5.00 0.00370 0.00375 0.00480 0.00440 0.00230 0.00405 0.00250 0.00460
19.75 0.00135 0.00210 0.00210 0.00210 0.00140 0.00210 0.00155 0.00245
45.00 0.00035 0.00050 0.00060 0.00060 0.00045 0.00080 0.00055 0.00085
90.00 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
135.00 0.00070 -0.00010 0.00060 0.00100 0.00065 0.00060 0.00065 0.00070
160.25 0.00210 0.00190 0.00180 0.00220 0.00185 0.00220 0.00155 0.00200
175.00 0.00300 0.00355 0.00260 0.00360 0.00405 0.00370 0.00375 0.00265


ACL Eccentricity.jpg
Bearing Eccentricity: ACL Bearings vs. stock 702/703 rod bearings

VAC Clevite Bearings

Production and Composition

Manufacturer: Clevite
Composition: Trimetal lead/copper
Coating: Calico CT-1
Part Number: SP1512HX
Target Market: OEM replacement market; Standard (factory) clearance, not extra.

Custom made by Clevite for VAC Motorsports.

The composition is a standard babbit lead/copper bearing with additional Calico non-friction coating. They are soft faced, and easy on the crankshaft, and compatible with stop-start vehicles.

Picture Description

VAC-SP1512HX.jpg

Dimensions

Bearing Dimensions (VAC Clevite Bearings) Metric Dimensions SAE (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom) 1.9901 mm 0.07835 inch
Bearing Thickness Variance (Top=Bottom) 1.9876 - 1.9914 mm 0.07825 - 0.07840 inch
Bearing Tolerance (Top=Bottom) -0.0025 - 0.0013 mm -0.00010 - +0.00005 inch


Bearing Clearance Specifications

VAC (Clevite) Custom Rod Bearings Metric Dimensions SAE (Inch) Dimensions
Rod + Bearing Dimensions 52.0344 mm 2.04860 inch
Rod + Bearing Variance 52.0294 - 52.0344 mm 2.04840 - 2.04860 inch
Nominal Rod Bearing Clearance 0.0508 mm 0.00200 inch
Bearing Clearance Variance 0.0406 - 0.0559 mm 0.00160 - 0.00220 inch
Bearing Clearance Tolerance -0.0102 - +0.0051 mm -0.00040 - +0.00020 inch
Bearing Clearance per Journal inch   0.00099 inch/inch
Bearing Clearance per Journal Inch Variance 0.00093 - 0.00103 inch/inch
Bearing Eccentricity 0.0203 mm 0.00080 inch
Bearing Eccentricity Variance 0.0114 - 0.0254 mm 0.00045 - 0.00100 inch
Bearing Eccentricity Tolerance -0.0089 - +0.0051 mm -0.00035 - +0.00020 inch


Clearance Measurements

Angle Rod-1 Rod-2 Rod-3 Rod-4 Rod-5 Rod-6 Rod-7 Rod-8
5.00 2.05160 2.05115 2.05080 2.05100 2.05100 2.05080 2.05120 2.05100
19.75 2.04920 2.04925 2.04925 2.04950 2.04940 2.04940 2.04945 2.04925
45.00 2.04860 2.04860 2.04860 2.04875 2.04875 2.04880 2.04880 2.04860
90.00 2.04860 2.04840 2.04840 2.04860 2.04860 2.04840 2.04860 2.04860
135.00 2.04900 2.04880 2.04865 2.04865 2.04865 2.04875 2.04885 2.04890
160.25 2.04905 2.04940 2.04920 2.04955 2.04920 2.04930 2.04940 2.04955
175.00 2.05060 2.05000 2.05100 2.05100 2.05060 2.05090 2.05100 2.05090
Clearance 0.00210 0.00190 0.00190 0.00210 0.00210 0.00190 0.00210 0.00210

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

Eccentricity Measurements

Angle Rod-1 Rod-2 Rod-3 Rod-4 Rod-5 Rod-6 Rod-7 Rod-8
5.00 0.00300 0.00275 0.00240 0.00240 0.00240 0.00240 0.00260 0.00240
19.75 0.00060 0.00085 0.00085 0.00090 0.00080 0.00100 0.00085 0.00065
45.00 0.00000 0.00020 0.00020 0.00015 0.00015 0.00040 0.00020 0.00000
90.00 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
135.00 0.00040 0.00040 0.00025 0.00005 0.00005 0.00035 0.00025 0.00030
160.25 0.00045 0.00100 0.00080 0.00095 0.00060 0.00090 0.00080 0.00095
175.00 0.00200 0.00160 0.00260 0.00240 0.00200 0.00250 0.00240 0.00230


VAC SP1512HX Eccentricity.jpg
Bearing Eccentricity: VAC-Clevite vs. stock 088/089 vs. stock 702/703 rod bearings

WPC Treated Bearings

Production and Composition

WPC treated bearings start life as standard 072/703 bearings. These bearings are sold through Auto Talent and EAS. An end-user may also send bearings to WPC for treatment. Unlike Calico CT-1 coating, the WPC treated bearings slightly remove material to create a low-friction surface. Manufacturer: WPC

Dimensions

Bearing (WPC Treated Bearings) Metric Dimensions SAE (Inch) Dimensions
Nominal Bearing Thickness (Top, Blue) 1.9939 mm 0.07850 inch
Nominal Bearing Thickness (Bottom, Red) 1.9901 mm 0.07835 inch
Bearing Thickness Variance (Top, Blue) 1.9939 - 1.9952 mm 0.07850 - 0.07855 inch
Bearing Thickness Variance (Bottom, Red) 1.9901 - 1.9914 mm 0.07835 - 0.07840 inch
Bearing Tolerance (Top, Blue) 0.0000 - 0.0013 mm 0.00000 - +0.00005 inch
Bearing Tolerance (Bottom, Red) 0.0000 - 0.0013 mm 0.00000 - +0.00005 inch


Bearing Clearance Specifications

WPC Treated Rod Bearings [* 2] Metric Dimensions SAE (Inch) Dimensions
Rod + Bearing Dimensions 52.0281 mm 2.04835 inch
Rod + Bearing Variance 52.0268 - 52.0332 mm 2.04830 - 2.04855 inch
Nominal Rod Bearing Clearance 0.0470 mm 0.00185 inch
Bearing Clearance Variance 0.0381 - 0.0546 mm 0.00150 - 0.00215 inch
Bearing Clearance Tolerance -0.0089 - +0.0076 mm -0.00035 - +0.00030 inch
Bearing Clearance per Journal inch   0.00090 inch/inch
Bearing Clearance per Journal Inch Variance 0.00088 - 0.00100 inch/inch


Calico Coated Bearings

Production and Composition

Calico coated bearings start life as standard 072/703 bearings. These bearings are sold through VAC, ESS, and Harrop. An end-user may also send bearings to Calico for coating. Calico adds their CT-1 coating to the surface of the bearing. The coating adds a slight thickness, thereby decreasing bearing clearance. The thickness to each shell is estimated by Calico between 0.0002 - 0.0004 inch.
Manufacturer: Calico Coatings
Manufacturing Defects: There's two primary manufacturing defects associated with Calico coated bearings.

  1. Calico coating is also placed on the parting lines. The material on the parting lines will affect the "bearing crush" and may wear unevenly or in a different manner than a standard OEM bearing.
  2. BMW bearings are sold in upper (blue) and lower (red) bearing shells. When the Calico coating is applied, this color distinction is lost. The upper (blue) bearings are slightly thicker than the lower (red) bearings. However, Calico habitually mixes these shells up and returns them to the customer mislabeled: uppers are now lowers, and visa-versa.

Dimensions

Bearing Dimensions (VAC-Calico Bearings) Metric Dimensions SAE (Inch) Dimensions
Nominal Bearing Thickness (Top, Blue) 2.0015 mm 0.07880 inch
Nominal Bearing Thickness (Bottom, Red) 1.9964 mm 0.07860 inch
Bearing Thickness Variance (Top, Blue) 1.9990 - 2.0028 mm 0.07870 - 0.07885 inch
Bearing Thickness Variance (Bottom, Red) 1.9990 - 2.0028 mm 0.07850 - 0.07860 inch
Bearing Tolerance (Top, Blue) -0.0025 - 0.0013 mm -0.00010 - +0.00005 inch
Bearing Tolerance (Bottom, Red) -0.0025 - 0.0000 mm -0.00010 - +0.00000 inch


Bearing Clearance Specifications

VAC (Calico) Coated Rod Bearings [* 3] Metric Dimensions SAE (Inch) Dimensions
Rod + Bearing Dimensions 52.0141 mm 2.04780 inch
Rod + Bearing Variance 52.0090 - 52.0141 mm 2.04760 - 2.04780 inch
Nominal Rod Bearing Clearance 0.0330 mm 0.00130 inch
Bearing Clearance Variance 0.0203 - 0.0356 mm 0.00080 - 0.00140 inch
Bearing Clearance Tolerance -0.0127 - +0.0025 mm -0.00050 - +0.00010 inch
Bearing Clearance per Journal inch   0.00063 inch/inch
Bearing Clearance per Journal Inch Variance 0.00054 - 0.00063 inch/inch


Bearing Notes

  1. ↑ 1.0 1.1 1.2 1.3 Roll-up of measurements taken from all cranks, all journals, and all OEM bearings.
  2. ↑ Full set of virgin WPC treated bearings measured in rods, and rolled-up with measurements from all cranks and all journals.
  3. ↑ Full set of virgin Calico coated bearings measured in rods, and rolled-up with measurements from all cranks and all journals.

Rod Bearing Part Numbers, History

BMW Part Number Description Location Color Standard Size Bearings Application Prod. Start Prod. End Superceded By
11 24 7 835 662 Connecting Rod Bearing Bottom Red 52.00 mm (+0.00 mm) S85B50 Apr-04 Apr-04 11 24 7 836 288
11 24 7 835 663 Connecting Rod Bearing Top Blue 52.00 mm (+0.00 mm) S85B50 Apr-04 Apr-04 11 24 7 836 289
11 24 7 836 288 Connecting Rod Bearing Bottom Red 52.00 mm (+0.00 mm) S85B50 Sep-04 Apr-07 11 24 7 838 088
11 24 7 836 289 Connecting Rod Bearing Top Blue 52.00 mm (+0.00 mm) S85B50 Sep-04 May-07 11 24 7 838 089
11 24 7 838 088 Connecting Rod Bearing Bottom Red 52.00 mm (+0.00 mm) S85B50, S65B40, S65B44 Feb-06 Oct-11 11 24 7 841 702
11 24 7 838 089 Connecting Rod Bearing Top Blue 52.00 mm (+0.00 mm) S85B50, S65B40, S65B44 Feb-06 Mar-11 11 24 7 841 703
11 24 7 841 702 Connecting Rod Bearing Bottom Red 52.00 mm (+0.00 mm) S85B50, S65B40, S65B44 Jun-10 Present
11 24 7 841 703 Connecting Rod Bearing Top Blue 52.00 mm (+0.00 mm) S85B50, S65B40, S65B44 Jun-10 Present  


BMW Part Number Description Location Color Oversize Bearings Application Prod. Start Prod. End Superceded By
11 24 7 835 974 Connecting Rod Bearing Bottom Red 51.75 mm (+0.25 mm) S85B50 Apr-04 Apr-04 11 24 7 836 290
11 24 7 835 975 Connecting Rod Bearing Top Blue 51.75 mm (+0.25 mm) S85B50 Apr-04 Apr-04 11 24 7 836 291
11 24 7 836 290 Connecting Rod Bearing Bottom Red 51.75 mm (+0.25 mm) S85B50 Aug-05 Dec-07 11 24 7 838 090
11 24 7 836 291 Connecting Rod Bearing Top Blue 51.75 mm (+0.25 mm) S85B50 Aug-05 Dec-07 11 24 7 838 091
11 24 7 838 090 Connecting Rod Bearing Bottom Red 51.75 mm (+0.25 mm) S85B50, S65B40, S65B44 Sep-05 Present
11 24 7 838 091 Connecting Rod Bearing Top Blue 51.75 mm (+0.25 mm) S85B50, S65B40, S65B44 Sep-05 Present  


Supporting Measurements

Connecting Rod Journals

Cyl-5 Cyl-1 Cyl-6 Cyl-2 Cyl-7 Cyl-3 Cyl-8 Cyl-4
Engine-1 2.04650 2.04655 2.04655 2.04650 2.04660 2.04655 2.04650 2.04660
Engine-2 2.04650 2.04655 2.04655 2.04650 2.04660 2.04660 2.04650 2.04650
Engine-3 2.04650 2.04650 2.04650 2.04650 2.04650 2.04650 2.04650 2.04650
Engine-4 2.04660 2.04670 2.04650 2.04660 2.04640 2.04640 2.04650 2.04650
Engine-5 2.04650 2.04650 2.04650 2.04650 2.04640 2.04640 2.04640 2.04640
Engine-6 2.04670 2.04680 2.04670 2.04670 2.04670 2.04670 2.04670 2.04670
Engine-7 2.04650 2.04650 2.04650 2.04650 2.04650 2.04650 2.04650 2.04650
Engine-8 2.04650 2.04650 2.04650 2.04650 2.04640 2.04640 2.04640 2.04640
Engine-9 2.04650 2.04650 2.04650 2.04650 2.04640 2.04640 2.04640 2.04640
Engine-10 2.04650 2.04650 2.04650 2.04650 2.04640 2.04640 2.04660 2.04660
Engine-11 2.04680 2.04680 2.04650 2.04650 2.04640 2.04650 2.04660 2.04670
Engine-12 2.04650 2.04650 2.04650 2.04650 2.04650 2.04650 2.04650 2.04650


Official Measurements

Min Max Official Min Dev. Max Dev.
Journal 2.04640 2.04680 2.04650 -0.00010 0.00030
Bearing 2.04815 2.04840 2.04820 -0.00005 0.00020
Clearance 0.00135 0.00200 0.00170 -0.00035 0.00030


Measurement Deviations

Journal Size Deviations
2.04630 0
2.04640 17
2.04650 53
2.04660 14
2.04670 9
2.04680 3
2.04690 0
2.04700 0


References

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