Why do I need an oversize bearing set?

Oversize bearings, like this +0.25mm set, are used when the crankshaft journals have been machined undersize during an engine rebuild. This ensures the correct oil clearance is maintained between the bearing and the crankshaft, which is critical for proper lubrication and bearing longevity.

What is tri-metal construction?

Tri-metal construction refers to a bearing design that uses three distinct layers of materials. Each layer is chosen for specific properties like strength, wear resistance, and embeddability, creating a well-balanced and durable bearing suitable for high-performance engines.

What is the tensile strength of these bearings?

The ACL connecting rod bearings in this set have a tensile strength of 200,000 psi. This indicates a very strong and durable material capable of withstanding significant stress within the engine.

1988-1991 BMW M3 Connecting Rod Bearings | ACL 4B1568H-.25

Name: ACL BMW E30 M3 S14B20/23/25 I4 Connecting Rod Bearing Set (Oversize +0.25)
Brand: ACL
SKU: acl-acl-bmw-e30-m3-s14b20-23-25-i4-connecting-rod-bearing-set-oversize-0-25-t14-321195
Price: 120.90 USD
Availability: BackOrder

ACL BMW E30 M3 S14B20/23/25 I4 Connecting Rod Bearing Set (Oversize +0.25)

$120.90

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 1988-1991 BMW M3. ACL connecting rod bearing set, oversize +0.25. Essential for engine rebuilds.

Key Features

Fits 1988-1991 BMW M3.
Oversize +0.25mm connecting rod bearing set.
Tri-metal construction for durability and performance.
Designed for S14B20, S14B23, and S14B25 I4 engines.

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Product Details

200,000 psi tensile strength puts these ACL connecting rod bearings well above stock hardware. If you're rebuilding the S14 engine in your 1988-1991 BMW M3, you need reliable bearings to keep everything running smoothly. These are designed to handle the demands of performance driving and ensure proper oil clearance for your connecting rods.

ACL has been making engine bearings for a long time, and they know what it takes to build a solid part. These bearings are built with a tri-metal construction, which is a standard for high-performance applications. This means they have multiple layers of different metals, each chosen for its specific job – like wear resistance and embeddability. This set is specifically sized at +0.25mm, which is crucial if your crankshaft journals have been machined down during an engine rebuild. Using the correct oversize bearing ensures you get the proper oil clearance, which is vital for bearing life and engine health.

When you're putting an engine back together, getting the bearing clearances right is one of the most important steps. This set from ACL is a popular choice for E30 M3 owners looking to do a proper engine rebuild. Make sure you have a clean work environment and follow the manufacturer's installation instructions carefully to get the best results.