Tri-metal main bearings HONDA B16A B17 B18 B20 K20 K24

The ACL RACE and KING RACING tri-metal main bearing sets consist of 14 bearing shells.

• Crankshaft main journal diameter (min/max): 54.980 / 55.000mm
• Crankshaft main bearing bore diameter (min/max): 59.000 / 59.020mm
• Maximum thickness: 2.002mm
• Maximum width: 20.000mm

ACL options available:

• Sizes: STANDARD, STANDARD WITH HX CLEARANCE, +0.025MM, +0.25MM
• Anti-friction coating: WITHOUT
• Part numbers: 5M1959, 5M1959H-STD, 5M1959HX-STD, 5M1959H-.025, 5M1959H-.25

ACL Race Series tri-metal bearings are manufactured to tight tolerances. CNC machining is carried out to within microns, before the diameters, thickness and width of the ACL Race Series tri-metal bearing are checked on metrology 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 4 layers:

• SAE1010 steel on the outside
• Copper alloy of 0.3mm
• Nickel of 0.0001mm
• Copper alloy of 0.013 to 0.018mm

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 with heavily boosted turbocharged or supercharged builds, or highly strung engines running at high rpm.

KING RACING options available:

• Sizes: STANDARD, STANDARD WITH HX CLEARANCE, +0.026MM
• Anti-friction coating: WITHOUT (only in +0.026MM), WITH
• Part numbers: MB5259, MB5259XPC, MB5259XPC STDX, MB5259XP.026, MB5259XPC.026

Since 1960 KING RACING has designed and manufactured high performance, high quality bearings. Beyond its highly capable production machinery, King Racing relies on simulation software to analyse the thermodynamics, dynamics and 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 made up of 3 to 4 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

Compatible engine list: