Tri-metal big end bearings MINI Cooper S R53 1.6 16V W11B16A

The tri-metal big end bearing sets from ACL RACE and KING RACING for the W11B16A engine consist of 8 bearing shells.

Technical specification

• Crankshaft big end journal diameter (min/max): 45.992 / 46.008mm
• Con rod big end bore diameter (min/max): 49.000 / 49.020mm
• Maximum wall thickness: 1.489mm
• Sizes: standard, standard with HX clearance, +0.025 or +0.25
• Anti-friction coating: none
• Part numbers: 4B2902, 4B2902H-STD, 4B2902HX-STD, 4B2902H-.025, 4B2902H-.25

ACL Race Series tri-metal bearings are manufactured to tight tolerances. CNC machining works to within microns, before the diameters, thickness and width of each ACL Race Series tri-metal shell are checked on measuring equipment. ACL Race Series bearings therefore give a reliable and consistent fit in your performance engine. ACL Race Series tri-metal bearings are in fact built up from four layers:

• SAE1010 steel on the outside
• 0.3mm copper alloy
• 0.0001mm nickel
• 0.013 to 0.018mm copper alloy

This choice of materials, combined with the manufacturing processes, makes ACL Race Series tri-metal bearings more resistant to increases in power, torque and engine speed. The compressive strength of ACL Race Series tri-metal bearings brings reliability to your engine even on heavily boosted turbocharged or supercharged builds, or on high-revving competition engines.

Technical specification

• Crankshaft big end journal diameter (min/max): 45.99 / 46.01mm
• Con rod big end bore diameter (min/max): 49.00 / 49.02mm
• Maximum wall thickness: 1.487mm
• Sizes: standard, standard with HX clearance, +0.026 or +0.25 or +0.5mm
• Anti-friction coating: none
• Part numbers: CR4600, CR4600XP, CR4600XP STDX, CR4600XP.026, CR4600XP0.25, CR4600XP0.5

KING RACING has been designing and manufacturing high performance, high quality bearings since 1960. Beyond its highly capable production machinery, King Racing uses simulation software to analyse the thermodynamics, the dynamics and the elasto-hydrodynamics of its bearings. KING RACING tri-metal bearings are produced in pMax Black, a tri-metal alloy 24% stronger than any existing tri-metal bearing.

KING RACING bearings are built up from three to four layers, depending on the application:

Outer: steel Intermediate: lead bronze Inner: babbitt with a high copper content Anti-friction coating containing lubricant and ceramic additives