ACL .50 Oversized Main Bearing Set

Fits 1988–1994 BMW E30 316i and 1990–1994 BMW E36 316i

Part #: 5M1538H-.50

Overview

The ACL .50 Oversized Main Bearing Set is a high-performance engine component designed for enthusiasts and professionals seeking reliable durability under demanding conditions. Crafted specifically for select BMW models from the late 1980s and early 1990s, these bearings are engineered to support higher RPM operation and enhance engine longevity. Whether you're rebuilding your engine or upgrading for improved performance, this bearing set offers a precise fit and consistent performance, ensuring your vehicle maintains optimal engine health and efficiency. Designed with advanced metallurgy and engineering, these main bearings are tailored to meet the rigorous demands of high-performance driving. They help reduce wear, manage heat effectively, and provide a stable foundation for your engine's moving parts. Ideal for those looking to restore or upgrade their BMW's engine, these bearings deliver peace of mind and dependable operation.

Key Features

Designed to withstand elevated RPM levels and high-stress conditions, these bearings are made from premium materials to ensure durability and reliability. The set features a .50 oversized design, offering a perfect match for engines requiring bore size adjustments. Precision manufacturing ensures a tight, accurate fit, supporting smooth engine operation and reducing the risk of failure. The high-quality construction helps maintain proper oil film thickness, promoting engine longevity and consistent performance. These bearings are an excellent choice for rebuilds, performance upgrades, or restoring factory specifications with enhanced durability.

Construction & Design

Manufactured with a specialized tri-metal construction, these main bearings combine a steel backing with a copper and aluminum overlay, providing excellent wear resistance and heat dissipation. The precise machining and coating processes ensure a uniform surface finish, which contributes to optimal oil retention and reduced friction during engine operation.

Driving Feel & Feedback

While primarily a performance and durability upgrade, these bearings support smoother engine operation, helping your vehicle run more reliably at higher RPMs. They contribute to consistent engine response and reduce the likelihood of bearing failure, supporting a confident driving experience.

Installation & Fitment

Proper installation requires standard engine rebuild procedures, including bore measurement and clearance checks. These bearings are designed as direct replacements for OEM specifications, ensuring a straightforward installation process for qualified technicians.

What’s Included

This set includes all the main bearings necessary for a complete engine rebuild or upgrade, ensuring comprehensive coverage for your engine's main journal bearings.