If you're diving into the world of high-performance engines, you know that the right bearings can make all the difference. The ACL Race Series Engine Bearings are a solid choice, especially if you're looking to push your Subaru to its limits. These bearings are crafted with a unique blend of design and metallurgy that really caters to those higher RPM conditions. Whether you've got a 4, 6, or 8-cylinder setup, these bearings are designed to take the heat and keep your engine running smoothly.

What Makes These Bearings Stand Out?

• High Strength Overlay: The overlay plate is thinner, which might sound counterintuitive, but it actually improves fatigue properties. You get the strength without the bulk.
• Hardened Steel Backs: All rod bearings come with hardened steel backs. This means better support for the bearing lining and helps keep everything locked in place.
• Increased Crush: This feature enhances bearing retention, so you won't have to worry about them shifting around under pressure.
• No Flash Plating: The elimination of flash plating on the back helps with heat transfer. This keeps your bearings cooler and improves grip between the bearings and housing.
• Increased Eccentricity: This compensates for any bore distortion at high RPMs and helps form those all-important hydrodynamic oil films.
• 3/4 Grooved Main Bearings: This design optimizes the load-carrying surface area and improves oil flow to the conrod bearings, which is crucial for performance.
• Tight Tolerances: Consistent wall tolerances help maintain clearances, so you can keep your engine running smooth and efficient.
• Chamfered Edges: Enlarged ID chamfers on the edges accommodate larger fillet radii on performance crankshafts, which is a nice touch for those of us pushing the limits.

Specifications You Should Know

• Sizes Available: STD, .025, .25, 0.5
• Oil Clearance: Plus Standard
• Half Type: Identical Halves
• Material: Tri-metal with Hardened Steel Backs
• Min Std Shaft Size: 1.8891 in / 47.984 mm
• Max Std Shaft Size: 1.8898 in / 48.000 mm
• Min Std Tunnel Size: 2.0079 in / 51.000 mm
• Max Std Tunnel Size: 2.0079 in / 51.000 mm
• Max Wall at Crown: 0.059 in / 1.498 mm
• Max Overall Length: 0.6154 in / 15.63 mm

Fitment

These bearings are a perfect fit for:

• Subaru Forester (1998-2017)
• Subaru Impreza (1993-2017)
• Subaru Legacy (1990-2017)

Specifically, the 4B8320HX-STD model is designed for the Subaru EJ20/EJ22/EJ25 engines with a 48mm journal size. It comes in standard size with extra oil clearance for that added performance edge. If you're serious about your engine build, these bearings are worth considering.