ACL Bearings 5M1144H-STD Race Series Main Bearing Set

ACL Performance Race Bearings are manufactured with a tri-layer metal with a hardened steel backing in order to withstand high RPM conditions, high stress loads, and high temperatures. This complete set includes 10 main bearings designed specifically for Mitsubishi 4G63 and 4G64 engines in 6-bolt configurations from 1983-1992.

Key Features:

• High strength overlay plate with reduced thickness for improved fatigue properties
• Hardened steel backs on all rod bearings to improve the support of the bearing lining and assist with bearing retention in the housing
• Increased crush for improved bearing retention
• Elimination of flash plating on the back of the bearings to improve heat transfer through the bearings and to maximize the grip between the bearings and its housing
• Increased eccentricity to compensate for bore distortion at high rpm and to assist in the formation of hydrodynamic oil films
• 3/4 grooved Main Bearings to optimize bearing load carrying surface area and oil flow to the conrod bearings

Technical Specifications:

• Bearing Material: F780 Tri-Metal Construction
• Size: STD (Standard)
• Overall Length: 23mm (0.906 inches)
• Shaft Size: 56.98-57mm (2.243-2.244 inches)
• Tunnel Size: 61-61.02mm (2.402 inches)
• Wall Thickness at Crown: 1.99mm (0.078 inches)
• Vertical Oil Clearance: 0.02-0.076mm

ACL is an engine builders top choice for their quality and consistency. You will find ACL in many cars on road as they are an Original Equipment supplier. ACL Race series performance bearings are for extreme endurance under harsh conditions, making them ideal for high-performance street builds, racing applications, and engine rebuilds that demand superior durability and precision.