Tri-metal main bearings HONDA B18A B20 B21 D16 D17 F23 H22

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

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

ACL options available:

• Sizes: STANDARD, STANDARD WITH HX CLEARANCE, +0.025mm, +0.25mm
• Anti-friction coating: NONE
• Part numbers: 5M1957H, 5M1957H-STD, 5M1957HX-STD, 5M1957H-.025, 5M1957H-.25

ACL Race Series tri-metal bearings are manufactured to tight tolerances. CNC machining is carried out to within microns before a metrology check of the diameters, thickness and width of each ACL Race Series tri-metal bearing. 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
• 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 turbo or supercharger builds, or high-revving engines.

List of compatible engines: