ACL Bearings 5M8174HX-STD Race Series Main Bearing Set with Extra Oil Clearance

The ACL Bearings 5M8174HX-STD is a high-performance Race Series main bearing set designed for Ford and Mazda 2.0L/2.3L DOHC Duratec and EcoBoost engines. These race-grade bearings feature advanced engineering with improvements in material composition, dynamic thickness, heat conduction, oil grooves, and oil distribution to deliver superior performance in demanding applications.

Key Features:

• HX designation provides 0.001" extra oil clearance on standard journal compared to standard H-series bearings
• Bearing material: F780 trimetal construction for high strength and seizure resistance
• Innovative design improves bearing retention from higher radial contact pressure and locks the bearing into the housing
• Designed to withstand higher RPM conditions for race and performance applications
• Standard size (STD) for unmodified crankshaft journals

Technical Specifications:

• Shaft size range: 2.0465" - 2.0472" (51.98mm - 52.00mm)
• Tunnel size range: 2.2448" - 2.2455" (57.019mm - 57.037mm)
• Overall length: 0.752" (19.1mm)
• Vertical oil clearance: 0.00181" - 0.00342"
• Wall thickness at crown: 0.0981" (2.491mm)

This bearing set is compatible with Ford 2.0L Duratec 20, Ford 2.3L Duratec 23, Ford 2.0L EcoBoost Turbo, Ford 2.3L EcoBoost Turbo, and Mazda L3 MZR engines found in applications including Mazda 3, Mazda 6, Mazda Tribute, Ford Focus RS, and Ford Mustang EcoBoost. The extra clearance HX specification is ideal for performance builds requiring additional oil flow and higher operating temperatures.