Engineered for high-performance applications, the ACL Race Series HX Main Bearing Set provides increased oil clearance and superior durability under high RPM conditions. Designed with a high-strength trimetal construction and a reduced-thickness overlay plate, these bearings offer improved fatigue resistance, enhanced crush retention, and excellent heat transfer – critical for competitive motorsport or demanding engine builds.

Key Features:

• HX Series with Extra Oil Clearance: Additional 0.025mm clearance ideal for high-performance and high-RPM builds.

• Trimetal Construction: Combines strength and wear resistance for reliable operation under extreme conditions.

• High-Strength Overlay Plate: Reduced thickness improves fatigue strength and bearing life.

• Hardened Steel Backing: Reinforces bearing support and housing retention.

• Improved Heat Dissipation: Flash plating elimination enhances heat transfer and bearing-to-housing grip.

• 3/4 Grooved Design: Optimizes oil flow and load distribution to the conrod bearings.

• Precision Manufacturing: Tight wall tolerances for consistent clearances and increased eccentricity for bore distortion compensation.

• Chamfered Edges: Enlarged ID chamfers accommodate high-performance crankshaft fillets.

Technical Specifications:

• Size: STD

• Tunnel Diameter: 61.000 – 61.021 mm

• Shaft Diameter: 56.985 – 57.000 mm

• Max Wall Thickness: 1.977 mm

• Max Length: 20.63 mm

• Half Type: Upper and Lower

• Weight: 0.30 kg

• Note: Use with ACL thrust washers P/N 1T1219

Vehicle Fitment:

Compatible with a wide range of Mitsubishi, Fiat, and Hyundai models equipped with 4G63, 4G64, or 4G69 engines, including:

• Mitsubishi Lancer Evolution I–IX (4G63-T)

• Mitsubishi Eclipse (2.0/2.4L DOHC/SOHC)

• Mitsubishi Galant, Outlander, Delica, L200, L300, L400 (2.0/2.4L)

• Mitsubishi Space Wagon, Space Runner, Santamo, Grandis, Sapporo

• Hyundai Stellar 2.0 8V (4G63)

• Fiat Fullback 2.4L (4G64)

For full compatibility, refer to the detailed vehicle fitment list or consult your engine specifications.

What’s Included:

• 1x Main Bearing Set (HX Extra Oil Clearance, STD Size)

• Includes upper and lower bearing halves