What does '0.25 Oversized' mean for these bearings?

The '0.25 Oversized' designation, often written as 0.25mm undersize, means these bearings are designed for a crankshaft that has been machined down by 0.25mm. This is typically done to correct wear or to achieve a specific bearing clearance after machining.

What is the CT-1 coating on these bearings?

The CT-1 coating is a dry-film lubricant applied by ACL. It helps to reduce friction and wear, especially during the engine's break-in period, and offers improved resistance to scuffing.

Are these bearings compatible with stock engines?

While these are high-performance bearings, they can be used in stock engines if the crankshaft has been machined to the correct undersize (0.25mm). For a stock, unmachined crankshaft, you would typically need standard size bearings.

ACL Acura B17A1/B18A1/B18B1/B18C1/B18C5 Honda K20A3/K20A2/K24A 0.25 Oversized High Perf CT-1 Coated

Specifications

Brand: ACL
Part #: 5M1959HC-.25
UPC: 9315726457689

ACL Acura B17A1/B18A1/B18B1/B18C1/B18C5 Honda K20A3/K20A2/K24A 0.25 Oversized High Perf CT-1 Coated

Name: ACL Acura B17A1/B18A1/B18B1/B18C1/B18C5 Honda K20A3/K20A2/K24A 0.25 Oversized High Perf CT-1 Coated
Brand: ACL
Price: 130.09 USD
Availability: InStock

$130.09

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ACL High Performance CT-1 Coated main bearings for Acura and Honda engines. Part# 5M1959HC-.25. 0.25mm undersize. Direct fit.

Key Features

Fits Acura Integra (1990-2001), RDX (2007-2012), RSX (2002-2006), TSX (2004-2008), Honda Accord (2003-2007), CR-V (1997-2009), Civic (2002-2005), and Element (2003-2011).
Features ACL's CT-1 coating for improved friction reduction and scuff resistance.
Main bearings are 0.25mm undersize, intended for use with a machined crankshaft.
High performance bearings suitable for modified and performance-oriented engines.
Well-built to handle the demands of performance applications.

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Will this fit your vehicle?

Product Details

Already running a built engine? These ACL High Performance CT-1 Coated main bearings are the next piece of the puzzle. They're designed to handle the increased demands of performance engines, whether you're pushing a B-series, K-series, or other compatible Honda/Acura powerplant. Getting the right bearing clearance is critical for oil pressure and engine longevity, especially when you've modified your engine.

ACL uses their CT-1 coating on these bearings, which is a dry-film lubricant that helps reduce friction and wear, particularly during the critical break-in period. This coating also offers improved resistance to scuffing. These are 0.25mm undersize bearings, meaning they're intended for crankshafts that have been machined down by 0.25mm to correct for wear or to achieve specific clearances. Proper installation requires careful attention to torque specifications and oil clearances, so it's best to consult your engine's service manual or a trusted mechanic.

This set includes main bearings for a wide range of Acura and Honda applications, including popular models like the Integra, RSX, Civic, and Accord. Ensuring you have the correct bearing size and type is crucial for maintaining oil pressure and protecting your engine's rotating assembly.