ACL 4B1584H-STD Rod Bearing Set for BMW N20/N26 2.0L Turbo Engines

Vehicle Fitment

• 2015-2021 BMW M3, M4, M2 Competition, M2 CS, 330i, 430i, 530i, 740i, Z4 M40i
• 2015-2021 Mini Cooper S (F55/F56/F57), JCW (F55/F56/F57)

Features

• Trimetal construction with high-strength overlay plate for enhanced fatigue resistance
• Thinner overlay design improves high-RPM durability
• Hardened steel backing for superior lining support
• Increased crush ensures secure bearing seating
• Elimination of flash plating enhances heat transfer and housing grip
• Optimized eccentricity to promote consistent oil film at high RPM
• Tight, consistent wall tolerances deliver reliable oil clearances
• Enlarged ID chamfers accommodate performance crankshaft fillets

Specifications

• Size: Standard (STD)
• Half Type: Identical halves (1 pair per set)
• Min shaft size: 1.9682" (49.993 mm)
• Max shaft size: 1.9690" (49.999 mm)
• Min tunnel size: 2.1102" (53.600 mm)
• Max tunnel size: 2.1109" (53.618 mm)
• Max wall at crown: 0.0591" (1.500 mm)
• Max overall length: 0.669" (17.00 mm)

Included Components

• 4x Connecting Rod Bearing Halves (two pairs, full set)

Product Description

The ACL 4B1584H-STD Race Series Rod Bearing Set is engineered specifically for high-performance BMW and Mini turbocharged 2.0 L N20 and N26 engines. With a tri-metal construction featuring a hardened steel backing and precision overlay, these bearings offer enhanced fatigue resistance and dependable performance under aggressive, high-RPM conditions.

Ideal for motorsport use, aggressive street tuning, or engines with significant thermal loads, this bearing set ensures reliable oil film formation and accurate clearance control. Fitment is confirmed for the listed BMW and Mini models; 2022-2025 compatibility remains unverified at the time of listing.