ACL 4B8172H-STD Race Series Rod Bearing Set for Ford 2.0/2.3L EcoBoost/Mazda MZR

Vehicle Fitment

• 2015-2025 Ford Mustang 2.3L EcoBoost
• 2016-2018 Ford Focus RS 2.3L EcoBoost
• 2013-2018 Ford Focus ST 2.0L EcoBoost
• 2013-2016 Ford Fusion 2.0L EcoBoost
• 2012-2024 Ford Edge 2.0L/2.3L EcoBoost
• 2016-2025 Ford Explorer 2.3L EcoBoost
• 2019-2025 Ford Ranger 2.3L EcoBoost
• 2021-2025 Ford Bronco 2.3L EcoBoost
• 2022-2024 Ford Maverick 2.0L EcoBoost
• 2019-2023 Lincoln Nautilus 2.0L EcoBoost
• 2007-2013 Mazdaspeed3 2.3L MZR DISI Turbo
• 2006-2007 Mazdaspeed6 2.3L MZR DISI Turbo
• 2007-2012 Mazda CX-7 2.3L MZR DISI Turbo

Fitment Notes

• Fits Ford 2.0L and 2.3L EcoBoost turbocharged engines
• Fits Mazda L3-VDT MZR DISI 2.3L turbocharged engines
• Standard size (STD) for use with crankshafts finished to OEM journal specifications
• Minimum standard rod journal diameter: 2.0465" (51.980mm)
• With notch design - check connecting rod requirements before ordering
• Complete set for 4-cylinder engine (4 pairs / 8 bearing shells)
• Professional installation recommended
• Verify crankshaft journal measurements before installation

Features

• ACL Race Series performance engine bearings - motorsport proven worldwide
• Advanced trimetal construction: hardened steel back, copper-lead intermediate layer, high-strength nickel overlay
• High-strength overlay plate with reduced thickness for improved fatigue resistance
• Hardened steel backs improve bearing lining support and housing retention
• Increased crush improves bearing retention and heat dissipation through higher radial contact pressure
• Elimination of flash plating maximizes heat transfer and grip between bearing and housing
• Increased eccentricity compensates for bore distortion at high RPM
• Eccentricity design assists formation of hydrodynamic oil film under extreme conditions
• Extended oil grooves and tapered groove run-out for uninterrupted big end oil supply
• Tapered groove run-out smooths oil supply cutoff, preventing pressure pulsing and cavitation
• Enlarged ID chamfers accommodate performance crankshafts with larger fillet radii
• Micron tolerance machining ensures consistent wall thickness and crush accuracy
• Higher tensile strength steel alloy improves rod bearing strength and retention
• Designed to withstand high RPM, extreme temperatures, and heavy loads
• Proven in NASCAR, NHRA, IHRA, drift racing, and sport compact competition

Specifications

• Part Number: 4B8172H-STD
• Brand: ACL
• Series: Race Series
• Type: Connecting Rod Bearing Set
• Engine Application: Ford/Mazda L3-VDT MZR Duratec 2.0L/2.3L Turbo
• Bearing Size: Standard (STD)
• Clearance: Nominal OEM specification
• Minimum Journal Diameter: 2.0465" (51.980mm)
• Construction: Trimetal (Steel/Copper-Lead/Nickel)
• Steel Back: Hardened High-Tensile Alloy
• Overlay: High-Strength Nickel
• Design: With Notch
• Quantity: 4 Pairs (8 Bearing Shells)
• UPC: 9315726437131
• Country of Origin: Australia
• Warranty: ACL Limited

Included Components

• (8) ACL 4B8172H-STD Race Series Connecting Rod Bearing Shells (4 Pairs)

Product Description

The ACL 4B8172H-STD Race Series Rod Bearing Set delivers championship-proven performance for Ford 2.0L and 2.3L EcoBoost engines as well as Mazda L3-VDT MZR DISI turbocharged applications. ACL Race Series bearings represent over 50 years of Australian engineering excellence and have earned their reputation in the most demanding motorsport environments, from NASCAR and NHRA drag racing to sport compact drift competition. The advanced trimetal construction combines a hardened high-tensile steel back with a copper-lead intermediate layer and high-strength nickel overlay, creating a bearing that substantially reduces friction while maintaining exceptional fatigue resistance under extreme loads. ACL's precision manufacturing process employs micron-tolerance machining to deliver consistent wall thickness and crush characteristics that engine builders demand. The elimination of flash plating on the bearing backs maximizes heat transfer and improves grip within the housing bore, while increased eccentricity compensates for bore distortion at high RPM and assists in forming a reliable hydrodynamic oil film. Extended oil grooves with tapered run-out ensure smooth, uninterrupted oil supply to the rod journals, preventing the pressure pulsing and cavitation that can occur under race conditions. Standard size bearings are precision finished to provide nominal clearance when used with crankshafts machined to OEM journal specifications. Whether building a turbocharged Mustang for the drag strip or refreshing a Mazdaspeed3 for spirited street driving, ACL Race Series bearings provide the durability and performance margin that serious engine builders require.