ACL .25 Oversized Main Bearing Set

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

Part #: 5M1538H-.25

Overview

The ACL .25 Oversized Main Bearing Set is engineered to enhance the durability and performance of your BMW engine. Designed specifically for certain E30 and E36 models, these high-quality bearings are ideal for drivers seeking reliable performance under higher RPM conditions. Whether you're rebuilding your engine or upgrading for increased strength, this bearing set offers a precise fit and long-lasting performance, ensuring your vehicle maintains optimal engine health and efficiency. These main bearings are crafted to withstand the stresses of high-performance driving, providing a stable foundation for your engine's crankshaft. They are suitable for enthusiasts and professional rebuilders who demand premium materials and engineering excellence in their engine components.

Key Features

Designed with advanced metallurgy and engineering to support high RPM operation

• Constructed from premium tri-metal materials for durability and wear resistance
• Precisely engineered to match OEM specifications for a perfect fit
• Oversized by .25 to accommodate engine rebuilds and bore enlargements
• Built to withstand the stresses of high-performance driving and racing conditions
• Affordable alternative to OEM bearings without compromising quality
• Engineered for consistent oil film retention and reduced friction

Construction & Design

These main bearings feature a tri-metal construction, combining a steel backing with layers of copper and aluminum alloys. This design ensures excellent load support, heat dissipation, and wear resistance, making them suitable for demanding engine environments. The precise machining and coating processes contribute to a smooth surface finish, reducing friction and enhancing engine longevity.

Performance & Response

By providing a stable and reliable bearing surface, these ACL main bearings help maintain proper crankshaft alignment and reduce engine vibrations. Their robust design supports higher RPM operation, contributing to smoother engine response and improved overall performance during spirited driving or racing scenarios.

Installation & Fitment

These bearings are designed for straightforward installation during engine rebuilds or repairs. Proper clearance and fitment are critical for optimal performance, and these bearings are manufactured to meet or exceed OEM standards, ensuring a secure and precise fit within your engine block.

What’s Included

The package includes a complete set of main bearings necessary for your engine rebuild or upgrade, ensuring all bearing surfaces are covered for a comprehensive solution.