What is the main function of main bearings in an engine?

Main bearings support the crankshaft within the engine block. They create a low-friction surface that allows the crankshaft to rotate smoothly while maintaining a critical oil film to prevent metal-on-metal contact and wear.

Are these bearings a direct replacement for stock main bearings?

Yes, these are standard size bearings designed to fit RB30 and RB30ET turbo engines. They are intended to replace your existing main bearings, provided the crankshaft journals are within factory specifications.

What is the advantage of using high-performance main bearings?

High-performance bearings, like these from ACL, are built with tighter tolerances and often use advanced materials. This helps them maintain proper oil clearance under higher loads and temperatures, which is common in turbo-charged or modified engines, leading to improved durability.

ACL Nissan RB30/RB30ET Turbo Standard Size High Performance Main Bearing Set

Specifications

Brand: ACL
Part #: 7M2394HX-STD
UPC: 9315726124130

ACL Nissan RB30/RB30ET Turbo Standard Size High Performance Main Bearing Set

Name: ACL Nissan RB30/RB30ET Turbo Standard Size High Performance Main Bearing Set
Brand: ACL
SKU: acl-acl-nissan-rb30-rb30et-turbo-standard-size-high-performance-main-bearing-set-t14-252482
Price: 123.51 USD
Availability: BackOrder

$123.51

On Backorder — Expected to ship by Apr 25, 2026

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

Fits 2009 Nissan GT-R. ACL high performance main bearing set for RB30/RB30ET turbo engines.

Key Features

Fits 2009 Nissan GT-R.
Standard size main bearing set for RB30 and RB30ET turbo engines.
High performance design from ACL.
Manufactured to precise tolerances for proper oil clearance.
Helps ensure smooth crankshaft rotation and engine longevity.

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Fits this vehicle

Nissan GT-R 2009

Product Details

You get a full set of high-performance main bearings in this kit, which means one box handles a critical part of your engine rebuild or upgrade. These ACL bearings are made to fit standard size RB30 and RB30ET turbo engines, commonly found in performance builds for vehicles like the 2009 Nissan GT-R. Main bearings are essential for keeping your crankshaft spinning smoothly within the engine block, and using a well-built set like these helps ensure proper oil clearance and long-term durability.

ACL has a solid reputation for making reliable engine components. This set uses their high-performance design, which is built to handle the demands of a turbo engine. They are manufactured to precise tolerances, ensuring they fit right and maintain the correct oil film between the crankshaft and the block. This is crucial for preventing wear, especially in high-output applications where oil pressure and temperature can fluctuate.

When you're rebuilding or significantly upgrading your engine, using quality internal components like these main bearings is a smart move. They are designed to work with your engine's existing crankshaft journals, assuming they are within factory specifications. Make sure to follow the manufacturer's installation instructions and torque specifications carefully during assembly for the best results.