What does '.025mm Oversized' mean for these bearings?

This means the bearings are precisely machined to be 0.025 millimeters larger in diameter than standard factory bearings. This is necessary when the engine's crankshaft journals have been ground undersize during a rebuild process to remove wear or damage.

What is the tri-metal overlay mentioned for these bearings?

The tri-metal overlay is a layered material construction used in high-performance bearings. It combines different metals to offer excellent strength, conformability to the crankshaft, and good embeddability for small debris, all while reducing friction.

Are these bearings suitable for a stock engine rebuild?

While these are high-performance bearings, they are also suitable for stock rebuilds, especially if the crankshaft journals have been machined undersize. Their robust construction and precise sizing help ensure proper oil clearance and long-term reliability.

Specifications

Brand: ACL
Part #: 5M8353H-.025
UPC: 9315726152843

ACL Mazda 4 B6/BP/BP-T 1.6/1.8L .025mm Oversized High Performance Main Bearing Set

Name: ACL Mazda 4 B6/BP/BP-T 1.6/1.8L .025mm Oversized High Performance Main Bearing Set
Brand: ACL
SKU: acl-acl-mazda-4-b6-bp-bp-t-1-6-1-8l-025mm-oversized-high-performance-main-bearin-t14-268467
Price: 79.86 USD
Availability: InStock

$79.86

Only 4 left in stock

ACL Mazda 4 B6/BP/BP-T 1.6/1.8L .025mm Oversized High Performance Main Bearing Set. These bearings are .025mm larger than stock to help rebuild worn engine blocks.

Key Features

Fits Kia Rio (2001-2005), Kia Sephia (1994-1997), Mazda 323 (1986-1994), Mazda MX-3 (1992-1995), Mazda Miata (1990-1997, 1999-2005), Mazda Protege (1990-2001), and Mercury Capri (1991-1994).
Main bearing set is .025mm oversized to accommodate machined crankshaft journals.
Features a tri-metal overlay for improved strength and wear resistance.
Designed for B6, BP, and BP-T 1.6L and 1.8L engines.
Helps restore proper oil clearance in rebuilt engines.

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About this part

Product Details

200,000 psi tensile strength puts these ACL main bearings well above stock hardware. If you're rebuilding a Mazda B6, BP, or BP-T engine, or one of its many siblings found in Kia, Mercury, and other Mazda models, these bearings are a solid choice for performance and longevity. They are precision-machined to be .025mm larger than factory specifications, which is crucial for engines where the main journals have been machined undersize during a rebuild. This slight increase in size helps to restore proper oil clearance, ensuring your engine runs smoothly and reliably.

ACL has been making engine bearings for a long time, and these are built with their experience in mind. They use a tri-metal overlay that's known for its strength and ability to handle the demands of performance engines. This material helps to reduce friction and wear, keeping your engine running cooler and longer. The .025mm oversize is a common size for engine machining, making these a practical choice for many rebuilds. They fit a wide range of vehicles, including the Mazda Miata, Protege, 323, MX-3, Kia Sephia and Rio, and the Mercury Capri.

When you're putting an engine back together, getting the bearing clearances right is critical. These ACL bearings give you that precision. Make sure to follow the manufacturer's installation instructions and use the correct torque specifications for your specific application to ensure a successful rebuild.