ACL Race Series main bearings M20 M50 M52 M54 S54

OEM replacement

For BMW 6 cylinder engines - 2.0 2.2 2.3 2.5 2.7 2.8 3.0 3.2 (M20 (just for variant with two bearing locks), M50B20, M52B20, M50B25, M52B25, M54B25, M54B30, M50B27, S50B30, S50B32, S52B32, S54B32)

• HIGH STRENGTH OVERLAY PLATE with reduced thickness for improved fatigue properties
• HARDENED STEEL BACKS on all rod bearings to improve the support of the bearing lining and assist with bearing retention in the housing.
• INCREASED CRUSH for improved bearing retention
• ELIMINATION OF FLASH PLATING on the back of the bearings to improve heat transfer through the bearings and to maximize the grip between the bearings and its housing.
• INCREASED ECCENTRICITY to compensate for bore distortion at high rpm and to assist in the formation of hydrodynamic oil films.
• 3/4 GROOVED MAIN BEARINGS to optimize bearing load carrying surface area and oil flow to the conrod bearings.
• TIGHT CONSISTENT WALL TOLERANCES to help you maintain consistent clearances.
• ENLARGED ID CHAMFERS on bearing edges where required to accommodate large fillet radius on performance crankshafts.