ACL Race BMW M5 S85B50 V10 conrod bearing set HX

Key Features & Benefits – ACL Race BMW M5 S85B50 V10 conrod bearing set HX

ACL Race BMW M5 S85B50 V10 conrod bearing set HX is intended for BMW S85B50 V10 rod bearing applications with a tri-metal build and identical halves. The design targets higher-RPM operating conditions and uses a reduced-thickness overlay approach.

H vs HX difference: H is the standard oil-clearance direction, while HX is used to set more oil clearance for the same application in a measurement-led build. Full guide: ACL Race HX vs H oil clearance.

When is this useful?

Choose the HX variant when your target oil clearance would be too tight with standard H and your final selection is driven by measured journal sizes, housing sizes and mock-up clearance checks.

Technical specs

• Type: Conrod bearing set
• Application: BMW M5, S85B50 V10
• Variant: HX
• Part number: 10B1580HX
• Construction: Tri-metal
• Tunnel: 56.000–56.013 mm
• Shaft: 51.975–51.991 mm
• Max wall: 1.998 mm
• Max length: 15.9 mm
• Half type: Identical halves

Selection & installation tips

• H or HX: Use H for standard oil clearance, use HX when you need more oil clearance, decided by measurement.
• Journal & housing checks: Measure crank pin journals and check rod housing roundness and size.
• Oil clearance: Confirm oil clearance during mock-up using the same method across all rods.
• Seating & tangs: Verify clean tang engagement and even bearing seating in the rod and cap.
• Clean assembly: Clean mating faces and oil paths, then use assembly lube before first start.

Before final assembly, match the chosen H or HX variant to your measured sizes, then verify the achieved oil clearance and compare it to the technical specs listed above.