ACL Race Main bearings BMW N54/55 S55 0.25mm (.25)
ACL
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Write a reviewACL bearings are used for tuning and engine upgrades where you want better quality with higher bearing capacity than normal standard bearings.
Improvements of material, dynamic thickness, heat conduction, oil grooves and oil distribution are some of the points that make ACL one of the leading bearing manufacturers.
Bearing data
Part number: 7M1397H
Bearing size: .25
Bearing half type: Upper & lower
Bearing material: F780
Technical data (mm)
Max overall length: 19.85
Max shaft size: 64.98
Max tunnel size: 70.019
Max vertical oil clearance: 0.114
Max wall at crown: 2.508
Min shaft size: 64.961
Min tunnel size: 70
Min vertical oil clearance: 0.06
Technical data (in)
Max overall length: 0.7815
Max shaft size: 2.5583
Max tunnel size: 2.7566
Max vertical oil clearance: 0.0045
Max wall at crown: 0.0987
Min shaft size: 2.5575
Min tunnel size: 2.7559
Min vertical oil clearance: 0.0024
Engine code
N54B30 / N55B30 / S55B30
Application
BMW N54B30 2979cc Inline6 DOHC 4v Twin Turbo
BMW N55B30 2979cc Inline6 DOHC 4v Turbo
BMW S55B30 2979cc Inline6 DOHC 4v Twin Turbo
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