ACL 7M2394H-STD Race Series Main Bearings for 1989-1998 Nissan RB/RD Engines

Vehicle Fitment

• 1989-1994 Nissan Skyline R32 (RB20E, RB20DE, RB20DET engines)
• 1993-1998 Nissan Skyline R33 (RB25DE, RB25DET)
• Nissan RB30E/RB30ET 2.8-3.0L inline-6 variants
• Nissan RD28 / RD28E / RD28T 2.8L SOHC inline-6 diesel/turbo

Features

• ACL Race Series main bearing set engineered for high-RPM, performance use
• Tri-metal copper-lead alloy construction with hardened steel backing for strength and fatigue resistance
• Standard (STD) journal diameter - direct replacement for OEM main bearings
• 3/4-grooved design for optimal oil flow and hydrodynamic lubrication
• Increased eccentricity to improve oil film formation under load
• High-strength overlay plate for better fatigue resistance
• Tight, consistent wall tolerances for reliable oil clearances
• Enlarged ID chamfers for performance crankshaft fillet radii

Specifications

• Part Number: 7M2394H-STD
• Brand: ACL
• Series: Race Series Main Bearing Set
• Size: Standard journal diameter (STD)
• Oil Clearance: Standard
• Material: Tri-metal alloy with hardened steel backing
• Half Type: Upper & lower halves
• Number of Bearings: 7 sets for all main journals

Included Components

• 7x Main bearing shells - standard size (upper & lower halves)

Product Description

The **ACL 7M2394H-STD Race Series Main Bearing Set** is a high-performance crankshaft bearing kit designed for Nissan RB-series and compatible inline-6 engines used in Skyline R32/R33 and RD28 variants from **1989-1998**. The tri-metal copper-lead construction with hardened steel backing ensures durability, fatigue resistance, and reliable lubrication under high-RPM and high-load conditions.

These main bearings provide standard journal fitment for direct OEM replacement. The 3/4-grooved design promotes optimal oil flow, while tight wall tolerances and increased eccentricity improve hydrodynamic lubrication at high engine speeds. Ideal for performance rebuilds or stock engine refreshes, this set ensures long-lasting reliability and consistent performance in demanding applications.