ACL Bearings 6B1510H-.25 Race Series Connecting Rod Bearing Set 0.25mm Undersize BMW B58 Toyota Supra

The ACL Race Series 6B1510H-.25 Connecting Rod Bearing Set is a high-performance replacement designed specifically for BMW B58B30 and S58B30 3.0L inline-6 turbocharged engines, as well as the Toyota Supra B58B30. This 0.25mm (0.010") undersize bearing set is engineered for reground crankshafts and precision engine rebuilds requiring tighter tolerances.

ACL Duraglide Tri-Metal Construction:

These race-proven bearings feature ACL's proprietary tri-metal design with hardened steel backing for maximum strength and durability. The high-strength overlay plate provides superior fatigue resistance and improved oiling performance during high-RPM operation, making them ideal for performance builds, turbocharged applications, and track use.

Key Features:

• 0.25mm (0.010") undersize for reground crankshafts
• Tri-metal construction with hardened steel backs for enhanced bearing retention
• Increased eccentricity to compensate for bore distortion at high RPM
• Enlarged ID chamfers accommodate large fillet radius performance crankshafts
• Elimination of flash plating improves heat transfer and housing grip
• Standard oil clearance with identical upper and lower halves
• Maximum wall thickness at crown: 0.0785 inches (1.993mm)
• Maximum overall length: 0.630 inches (16.00mm)

Applications:

Designed for BMW models including 340i, 440i, 540i, M240i, M340i, Z4, and Toyota GR Supra A90 equipped with the B58B30 3.0L turbocharged inline-6 engine. Also compatible with BMW S58B30 engines found in M3, M4, X3M, and X4M models.

Technical Specifications:

• Material: Tri-metal with hardened steel backing
• Half Type: Identical halves (upper and lower)
• Oil Clearance: Standard
• Min Shaft Size: 1.9281 inches (48.975mm)
• Max Shaft Size: 1.9288 inches (48.991mm)
• Min Tunnel Size: 2.0866 inches (53.000mm)
• Max Tunnel Size: 2.0872 inches (53.015mm)

ACL Race Series bearings are the choice of professional engine builders and have proven themselves in motorsports applications from drift racing to NASCAR competition. Complete set includes all six connecting rod bearing pairs needed for the inline-6 engine.