Bearings Connecting rods tri-metal BMW M20 M50 M52 M54

The Bearing Games of Connecting rods trimetalACL RACE and King Racing for M20, M50, M52 and M54 engines are made up of12 Bearings.

Find below (click on the image) the trimetal Crankshaft Bearings for BMW M20, M50, M52 and M54 engines and the plastigage wires to check the Bearings/Crankshaft operating set:

Technical characteristics

• Crankpins Crankshaft Diameter (min/max): 44.975 / 44.991mm
• Big Ends diameter (min/max): 48,000 / 48,016mm
• Max thickness: 1,493mm
• Side(s): standard or standard with HX clearance or +0.025 or +0.25 or +0.5mm
• Anti-friction Coating: without
• References: 6B1490, 6B1490H-STD, 6B1490HX-STD, 6B1490H-.025, 6B1490H-.25, 6B1490H-.50

ACL Race Series Trimetal Bearings are manufactured to exacting tolerances. Numerical control machining takes place in microns before metrology control of the diameters, thickness and width of the ACL Race Series trimetal bearing. Thus the ACL Races Series Bearings ensure a reliable and constant adjustment in your performance engine. The ACL Races Series trimetal bearings are actually made up of 4 layers:

• SAE1010 steel located outside
• 0.3mm copper alloy
• 0.0001mm nickel
• Copper alloy from 0.013 to 0.018mm

This material strategy combined with manufacturing processes make the ACL Races Series trimetal bearings more resistant to increases in power, torque or even engine speed. The COMPRESSION RESISTANCE of the ACL Race Series Trimetal Bearings makes it possible to provide reliability to your engine even with Turbo preparations or compressors with high boosts, or sharp engines with high rotation speeds.

Technical characteristics

• Crankpins Crankshaft Diameter (min/max): 44.97 / 44.99mm
• Big Ends diameter (min/max): 48.00 / 48.02mm
• Max thickness: 1,491mm
• Side(s): standard or standard with HX clearance or +0.026 or +0.25 or +0.5mm
• Anti-friction Coating: with or without
• References: CR6640, CR6640XP, CR6640XP STDX, CR6640XP.026, CR6640XP0.25, CR6640XP0.5,CR6640XPC, CR6640XPC STDX, CR6640XPC.026, CR6640XPC0.25, CR6640XPC0.5

Since 1960, the company King Racing has designed and manufactured high-performance/quality bearings. Beyond high-performance Production machines, King Racing relies on simulation software to analyze the thermodynamics, dynamics and elasto-hydrodynamics of their Bearings. King Racing Trimetal Bearings are produced in pMax Black, a trimetal alloy 24% stronger than all existing trimetal Bearings.

The King Racing Bearings are made up of 3 to 4 layers (depending on the Applications):

Exterior: steel Intermediate: lead bronze Interior: regulates with high percentage of copper Anti-friction Coating containing lubricant and ceramic additives