ACL 6B2484H-STD Race Rod Bearings for 2013-2019 Porsche 911 Turbo MA1.71 3.8L

Vehicle Fitment

• 2013-2019 Porsche 911 Turbo / Turbo S (991.1 and 991.2, MA1.71 3.8L Twin-Turbo H6)

Fitment Notes

• Fits the MA1.71 3.8L twin-turbocharged flat-six only; does not fit naturally aspirated 991 Carrera engines (MA1/MA2 series 3.4L/3.0L/3.8L) or the earlier 997-generation Turbo engine

Features

• ACL Race Series Trimetal construction for high-performance and high-RPM applications
• High-strength overlay plate with reduced thickness for improved fatigue properties
• Hardened steel backing to improve bearing lining support and retention in the rod
• Increased crush for improved bearing retention under load
• Flash plating eliminated from bearing backs for improved heat transfer
• Increased eccentricity to compensate for bore distortion at high RPM
• Optimized oil groove design for consistent lubrication under boost
• Upper and lower half bearing design for precise fitment

Specifications

• Position: Rod (big end/connecting rod) bearing set
• Size: Standard (STD)
• Bearing material: F781 alloy
• Max shaft size: 52.990mm (2.0862 in)
• Min shaft size: 52.971mm (2.0855 in)
• Max overall length: 15.75mm (0.6201 in)
• Vertical oil clearance range: 0.054mm-0.108mm (0.0021-0.0043 in)

Included Components

• 1x ACL Race Series Rod Bearing Set (full set for one engine)

Product Description

The ACL 6B2484H-STD Race Series rod bearing set is purpose-built for the Porsche 991 911 Turbo and Turbo S, covering the MA1.71 3.8L twin-turbocharged flat-six used across both the 991.1 (2013-2016) and 991.2 (2016-2019) model years.

Built with ACL's Trimetal overlay and hardened steel backing, this standard-size set is designed to handle the higher cylinder pressures and sustained boost loads of a factory-turbocharged flat-six, making it a strong choice for engine rebuilds, freshening a high-mileage Turbo, or supporting a mildly tuned build without changing crank journal size.

Always confirm actual rod journal diameter with a machine shop measurement before installation, and plastigauge or micrometer-check final clearance during assembly rather than relying on nominal sizing alone.