What is the purpose of the extra oil clearance on these bearings?

The extra 0.025mm (0.001 inch) oil clearance allows for a slightly larger gap between the bearing and the crankshaft journal. This can improve oil flow, help dissipate heat, and reduce friction, which is beneficial in high-performance or high-RPM engine builds.

Are these bearings a direct replacement for all 4G63 engines?

These bearings are standard size and designed for 4G63 and 4G64 engines, but it's important to verify your specific engine configuration. They are noted for 7-bolt 4G63 engines and engines from 1997 onwards that use thrust washers, as well as earlier flange main configurations.

What is needed for installation?

Proper installation requires meticulous cleaning of the crankshaft journals and connecting rod bores. It is also crucial to use a high-quality assembly lubricant specifically designed for engine bearings to ensure adequate lubrication during initial startup.

ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IX Standard Size High Performance w/ Extra Oil

Specifications

Brand: ACL
Part #: 4B1185HX-STD
UPC: 9315726280430

ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IX Standard Size High Performance w/ Extra Oil

Name: ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IX Standard Size High Performance w/ Extra Oil
Brand: ACL
SKU: acl-acl-mitsubishi-4g63-4g64-7-bolt-2nd-gen-dsm-and-evo-i-ix-standard-size-high--t14-12956
Price: 46.77 USD
Availability: InStock

$46.77

In Stock

ACL Performance Connecting Rod Bearing Set 4B1185HX-STD for Mitsubishi 4G63/4G64 engines. Standard size with extra oil clearance.

Key Features

Fits various Mitsubishi 4G63, 4G63T, and 4G64 engines, including DSM and EVO models.
Standard size connecting rod bearings.
Features an extra 0.025mm (0.001 inch) oil clearance for improved oil flow and reduced friction.
Designed for high-performance applications and engine rebuilds.
Well-built by ACL, a reputable manufacturer of engine components.

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Will this fit your vehicle?

Product Details

If you're rebuilding the bottom end of your Mitsubishi 4G63 or 4G64 engine, especially for a performance build, these ACL high-performance connecting rod bearings are a solid choice. They're designed with an extra 0.025mm (0.001 inch) of oil clearance, which is thinner than stock. This extra clearance is beneficial in high-performance applications where increased oil flow and reduced friction are critical for keeping engine temperatures in check under load.

ACL has been making engine bearings for a long time, and these are well-built for demanding use. They're made to fit Mitsubishi 4G63, 4G63T, and 4G64 engines, covering a wide range of DSM and EVO models, as well as some Hyundai and Kia applications. The standard size ensures they're ready to go in without needing to machine the crankshaft, making them a practical option for many rebuilds. This set is for the connecting rods, and it's important to get the right set for your specific engine configuration, particularly noting the 7-bolt 4G63 variations and whether your engine uses flange mains or thrust washers.

When you're putting these in, remember to follow the manufacturer's installation instructions carefully. Proper cleaning of the crankshaft journals and connecting rod bores is essential, and using the correct assembly lube will help ensure these bearings perform as intended from the very first start-up. This set is a key component for anyone looking to build a reliable, high-revving engine.