ACL Main Bearings

2020 Toyota GR Supra 3.0L Inline 6

7M1512H-.50

Overview:

The ACL Main Bearing Set is engineered specifically for the Toyota GR Supra 2020 model equipped with the BMW B58B30 and S58B30 3.0L inline 6-cylinder engines. These bearings are designed to provide reliable, high-performance support for the crankshaft, ensuring smooth engine operation and longevity. Ideal for enthusiasts and professional rebuilders alike, this main bearing set addresses the critical need for precision fitment and durability in high-stress applications.

While this particular set is undersized by 0.50mm (0.020"), it is currently not available yet, but once released, it will offer a perfect solution for engines requiring this specific bearing dimension due to machining or wear. ACL’s reputation for quality and performance makes this bearing set a trusted choice for maintaining or restoring the integrity of your Supra’s powertrain.

Key Features:

Designed with precision and durability in mind, the ACL Main Bearings offer the following key features:

• Exact fitment for 2020 Toyota GR Supra with BMW B58B30 and S58B30 engines
• Undersize dimension of 0.50mm (0.020") for engines requiring this specification
• Manufactured from premium materials to withstand high loads and temperatures
• Engineered to provide optimal oil clearance for superior lubrication
• Enhanced fatigue resistance for extended engine life
• Precision machining ensures consistent thickness and roundness
• Compatible with high-performance and stock rebuild applications
• Meets or exceeds OEM specifications for reliability and performance

Construction & Design:

ACL main bearings are crafted using advanced metallurgy and manufacturing techniques to deliver exceptional strength and wear resistance. The bearing shells are typically composed of a tri-metal construction, combining a steel backing with layers of copper-lead or aluminum alloys and a soft overlay to provide excellent conformability and embedability. This design helps protect the crankshaft journal from scoring and damage under extreme operating conditions.

The undersize dimension of 0.50mm (0.020") is critical for engines that have undergone crankshaft grinding or machining to restore journal surfaces. This ensures the bearing maintains proper oil clearance and alignment, preventing premature wear and potential engine failure.

Installation & Fitment:

Installation of ACL main bearings requires professional engine rebuilding experience and proper tools. The undersize bearings must be matched precisely to the crankshaft journal dimensions to achieve correct oil clearance. It is essential to measure journal diameters and bearing clearances accurately before installation. These bearings fit directly into the main bearing caps and engine block saddles of the 2020 Toyota GR Supra with the specified BMW inline 6 engines without modification.

Proper lubrication during assembly and torque specifications should be followed according to the vehicle manufacturer’s service manual to ensure optimal performance and longevity.

What’s Included

• Main bearing shells sized at 0.50mm (0.020") undersize
• Complete set for all main bearing positions required by the engine
• Packaging and instructions for identification and installation guidance

Ideal For:

This ACL Main Bearing Set is ideal for engine builders, performance tuners, and mechanics working on the 2020 Toyota GR Supra equipped with the BMW B58B30 or S58B30 3.0L inline 6 engines. It is especially suited for engines that have undergone crankshaft machining or require undersized bearings to restore proper clearances. Whether rebuilding a high-mileage engine or upgrading for enhanced durability, this bearing set provides the reliability and precision needed for demanding applications.

ACL Race Series is known for performance engine bearings used across motorsports, with rod and main bearing options engineered for durability under high load and heat. Their positioning centers on racing-focused design, metallurgy, and engineering intended to stand up to demanding competition engines.