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Precision Bearings Built for the 991 Turbo Flat Six
The ACL 6B2484H connecting rod bearing set is engineered specifically for the MA1.71 3.8L twin turbo flat six found in the Porsche 991 Turbo and Turbo S. Built with ACL's high performance alloy formulation, this set restores or upgrades rod bearing clearance and durability for engines running stock or elevated boost levels.
Key Features
- Direct fit connecting rod bearing set for the Porsche 991 Turbo MA1.71 3.8L flat six
- Advanced tri-metal bearing construction for high load performance applications
- Improved crush and conformability compared to typical OEM replacement bearings
- Precision manufactured to tight tolerances for consistent oil clearance
- Available in standard and oversize configurations for engine builders
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2013-2016 | Porsche | 911 | Turbo |
| 2013-2016 | Porsche | 911 | Turbo S |
Specifications
| Detail | Value |
|---|---|
| ACL Part Number | 6B2484H |
| Bearing Type | Connecting Rod Bearing Set |
| Engine Code | MA1.71 3.8L Twin Turbo Flat Six |
| Size | Standard |
| UPC | Not assigned by manufacturer |
| Warranty | Manufacturer limited warranty |
What's Included
- Complete set of ACL 6B2484H connecting rod bearings
- Installation reference sheet
About ACL
ACL has manufactured performance engine bearings for decades, supplying builders and racers with bearings engineered to handle the loads of forced induction and high RPM applications. Their tri-metal and race series bearing lines are trusted across import and European performance platforms for consistent clearance and long service life.
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FAQ
What is the ACL 6B2484H?The ACL 6B2484H is a connecting rod bearing set engineered specifically for the Porsche 991 Turbo and Turbo S MA1.71 3.8L twin turbo flat six engine.
Which Porsche models use this bearing set?This bearing set fits the 2013-2016 Porsche 911 Turbo and 2013-2016 Porsche 911 Turbo S, both equipped with the MA1.71 engine.
Is this bearing set suitable for stock power levels or only built engines?It is suitable for both. Many owners install it during routine engine service at stock power, while others use it as part of a built engine for elevated boost applications.
Does this bearing set include main bearings?No. This is a connecting rod bearing set only. Main bearings are sold separately.
What bearing material does ACL use for this set?ACL uses a tri-metal alloy construction designed for improved load capacity and conformability compared to typical OEM bearings.
Are oversize options available for this part number?ACL offers this bearing in standard and oversize configurations to support engines that have been machined during a rebuild.
Do I need any special tools to install this bearing set?Standard engine building tools including a torque wrench, plastigauge, and proper engine stand or lift access are recommended for correct installation.
Why upgrade to aftermarket rod bearings on a 991 Turbo?Aftermarket bearings like the ACL 6B2484H are commonly chosen during engine rebuilds or power upgrades to ensure consistent clearance and reliability compared to reused factory bearings.
Install Instructions
- Remove the engine and disassemble the short block per factory service procedures
- Inspect crankshaft rod journals for wear, scoring, or out of round condition
- Measure bearing clearance using plastigauge before final assembly
- Install the ACL 6B2484H bearing halves into the connecting rods and rod caps
- Torque connecting rod fasteners to factory specification in the proper sequence
- Reassemble the engine and verify oil pressure before extended operation
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