ACL Rod Bearings for F8X BMW M3/M4 (4B1584HX-STD)

ACL Race Series performance engine bearings are manufactured to exacting tolerances for the S55 engine. Micron tolerance machining supported by precision measurement systems delivers consistent accuracy to key characteristics like wall thickness and crush. This ensures reliable fit and helps maintain consistent clearances.

Engine Fitment:
2015-2018 BMW M3 (F80)
2015-2020 BMW M4 (F82/F83)
2019-2021 BMW M2 Competition/CS (F87)
(S55 3.0L Twin Turbo Engine)

Purchase Includes:
ACL BMW N20B20 / N26B20 2.0L Inline Race Series Standard Size Conrod Rod Bearing Set
Please Note: Photos are for reference

Benefits:
• A blend of characteristics to provide high strength and excellent seizure resistance.
• No flash plating is applied to further improve bearing retention and maximize heat transfer.
• Improved bearing retention from higher radial contact pressure.
• More effective heat dissipation through improved thermal transfer.
• Increased eccentricity to improve shape adaptation to compensate for bore distortion at high speed operation.
• Assists in the formation of hydrodynamic oil film.
• Full (180°) grooved uppers with matching partial groove in lowers.
• Reduces interruption to big end oil supply. Tapered groove run-out.
• Smooths big end supply cut-off avoiding pressure pulsing and cavitation

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