What does '0.25mm undersize' mean for these rod bearings?

This means the bearings are 0.25mm (or 0.010 inches) smaller in diameter than a standard size bearing. This size is used when the crankshaft journals have been machined down to a smaller diameter during an engine rebuild.

Do I need to replace all the rod bearings when doing an engine build?

Yes, it is standard practice to replace all connecting rod bearings when rebuilding or modifying an engine. This ensures consistent clearances and performance across all cylinders.

What is the difference between standard and performance rod bearings?

Performance rod bearings, like these from ACL, are typically made with more robust materials and tighter tolerances to withstand higher engine speeds and loads found in performance applications.

ACL Hyundai G4KF 2.0T 0.25 Oversized High Performance Rod Bearing Set

Specifications

Brand: ACL
Part #: 4B1293H-.25
UPC: 9315726437254

ACL Hyundai G4KF 2.0T 0.25 Oversized High Performance Rod Bearing Set

Name: ACL Hyundai G4KF 2.0T 0.25 Oversized High Performance Rod Bearing Set
Brand: ACL
Price: 113.66 USD
Availability: InStock

$113.66

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ACL Hyundai G4KF 2.0T .25mm undersize rod bearing set. For high-performance engine builds.

Key Features

Fits Hyundai Genesis Coupe (2010-2012), Sonata (2011-2013), Kia Forte Koup (2010-2013), Forte (2010-2013), Optima (2011-2013), and Sportage (2011-2013).
Designed for the Hyundai G4KF 2.0T engine.
Set includes connecting rod bearings for all cylinders.
Features a 0.25mm (0.010 inch) undersize for use with a ground crankshaft.
ACL is a well-known manufacturer of engine bearings.

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Will this fit your vehicle?

Product Details

If you're building a performance engine for your Hyundai or Kia, especially one with the G4KF 2.0T engine, these ACL connecting rod bearings are a critical component. They sit between the connecting rod and the crankshaft, allowing the rod to rotate smoothly while handling the immense forces generated during combustion. When you're pushing an engine harder than stock, or if you're rebuilding with tighter tolerances, replacing these bearings is a must.

This set is specifically sized at 0.25mm undersize, which is 0.010 inches smaller than a standard bearing. This is important if your crankshaft has been ground down to a smaller size during a rebuild to clean up imperfections or to achieve specific clearances. ACL is known for making well-built engine bearings, and these are designed to handle the increased demands of a performance application. They are a popular choice for tuners and mechanics working on these specific Hyundai and Kia engines.

This set includes the bearings for all the connecting rods in your engine. Always refer to your vehicle's service manual for the correct installation procedures and torque specifications when replacing engine bearings.