Standard crankshaft bearings for BMW N54B30A / N55B30A / S55B30

Standard crankshaft bearings for BMW N54B30A / N55B30A / S55B30

ACL Trimetal bearings (hardened steel + copper + nickel) are designed for racing use. They reduce friction, improve operating temperatures and optimise oiling.

The ACL-7M1397H-STD model is specially designed for BMW engines, offering perfect tolerance for precise connecting rod adjustment.

These bearings are available in STD rib and also in repair rib.

Features :

Supplier reference: ACL-7M1397H-STD

Tolerance: Standard size (STD)

Material: Tri-metal alloy (copper, lead, tin)

Recommended use: Motorsport, competition, engine preparation

Advantages : Increased wear resistance, optimum heat dissipation, precise fit

Dimensions :

• Maximum overall length: 19.85mm
  
• Maximum axle size: 64.98mm
  
• Maximum tunnel size: 70.019mm
  
• Max vertical oil clearance: 0.114mm
  
• Max wall to crown: 2.508mm
  
• Minimum axle size: 64.961mm
  
• Minimum tunnel size: 70mm
  
• Minimum vertical oil clearance: 0.06mm

Compatibility :

BMW

- N54B30A: E90 335i / Z4 roadster / E92 335i Xdrive

-N55B30A: F80 335i / E92 335i / F22 M 235i

- S55B30: M3 F80 / M4 F82 / M4 F83