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Acl race series connecting rod bearing set porsche 911 991 ma1. 71

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ACL Race Series Connecting Rod Bearing Set PORSCHE 911 991 MA1.71

SKU: N/A Categories: ACL, BMW 6 Series Parts & Accessories, BMW E63 | E64 Engine & Performance Parts, BMW E63 | E64 Parts & Accessories, Brands, Engine & Performance, Engine Bearings, Porsche 911 Parts & Accessories, Porsche 991 Engine & Performance Parts (911), Porsche 991 Parts & Accessories (911), Porsche Parts & Accessories Tags: ACL, BMW, Engine Bearlings

229.99€

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The ACL Race Series Connecting Rod Bearing Set for the Porsche 911 (991) MA1.71 engine is built for drivers who don’t settle for “good enough.” This bearing set was made for those who push their flat-six hard—on track, backroad, or wherever the revs climb high and the oil temp follows. Porsche’s 3.8-liter and 4.0-liter MA1 engines are mechanical art, but like all high-performance units, they demand precision under pressure. That’s where ACL steps in.

These bearings use ACL’s proven tri-metal design: a steel backing for strength, a copper-lead layer for load support, and a fine overlay that keeps the oil film steady even under extreme heat and load. The result is smooth, predictable lubrication that protects your crank and rods through long sessions at high RPM. It’s the kind of engineering that keeps a race engine alive when everything else is running on the edge.

Think of it as quiet insurance. Every time you pull through the gears or hold it flat down a straight, these bearings help your engine stay cool, stable, and happy. They’re made from the same materials trusted by top-level motorsport teams—built to resist fatigue, maintain perfect oil clearance, and preserve that crisp Porsche response you bought the car for in the first place.

Installation is straightforward. ACL designed this set as a direct replacement for the MA1.71, so you get factory-fit precision without extra machining. It’s plug-and-play peace of mind for builders and enthusiasts alike.

If your 911 spends more time at redline than at cruise, this upgrade isn’t optional—it’s essential. The ACL Race Series bearings reinforce the foundation of your flat-six, keeping it smooth, strong, and ready for more. Because when the tach swings past seven grand and the sound turns sharp and metallic, you’ll want a bottom end that’s built to take it.

FEATURES

High-performance upgrade for Porsche power: The ACL Race Series Connecting Rod Bearing Set delivers a tougher, longer-lasting solution for the 911’s MA1.71 flat-six engine. Designed to handle extreme heat, heavy loads, and the relentless stress of high RPM, these bearings bring track-ready durability to your street or race build.#
Precision-engineered for Porsche performance: Built to tackle the bearing wear and oil pressure variations that can plague high-revving flat-sixes, ACL’s bearings ensure consistent lubrication and stability from idle to redline—mile after mile, lap after lap.
Factory-grade precision: Each bearing is manufactured to exact Porsche tolerances, preserving correct oil clearances, maintaining stable pressure, and extending bearing life even during sustained high-load operation. The fit is seamless, the performance—immediate.
Race-proven tri-metal construction: A hardened steel backing provides strength, the copper-lead core adds superior load support, and the precision overlay ensures a reliable oil film even under punishing thermal conditions. The combination delivers exceptional fatigue resistance and thermal control when the engine’s working hardest.
Optimized bearing-to-housing contact: ACL’s non-tin flash surface promotes consistent fitment and alignment, minimizing distortion under stress. It’s a subtle but vital refinement that keeps everything running true, even when the revs and temperatures soar.
Built for endurance and confidence: Proven in motorsport and endurance environments, ACL Race Series bearings reinforce the heart of your 911’s engine. They deliver the dependability, smoothness, and mechanical confidence that Porsche enthusiasts expect—whether it’s for spirited road drives, fast laps, or long-distance runs at full song.

Acl structure

APPLICATIONS

2013–2016 Porsche 911 991 Turbo MA1.71

NOTES

Specifications for STD size only.

Includes upper and lower bearing shells for a complete rod bearing replacement.

ADDITIONAL INFORMATION:

Brand	ACL
Half Type	Upper & lower
Material	F781
Min. Std Shaft Size	52,971 mm / 2.0855 in
Max. Std Shaft Size	52,99 mm / 2.0862 in
Min. Std Tunnel Size	56 mm / 2.2047 in
Max. Std Tunnel Size	56,013 mm / 2.2052 in
Max Wall at Crown	1,495 mm / 0.0589 in
Max Overall Length	15,75 mm / 0.6201 in

PREPREG is a common term for a reinforcing fabric such carbon which has been pre-impregnated with a resin system. This resin system (typically epoxy) already includes the proper curing agent. As a result, the prepreg is ready to be laid into the mold without the addition of any more resin. In order for the laminate to cure, an autoclave production process is used, a combination of high pressure and heat.

Maximum strength and performance characterictics. In a hand layup production process, it is difficult to achieve 50% fabric and 50% resin content. Typical hand laminates, even when vacuum bagged, end up with a significant amount of excess resin. Excess resin increases brittleness and reduces overall strength properties. On the other hand, most prepregs contain around 35% resin. This is ideal for maximum cured properties and generally impossible to achieve in normal hand lamination.
Uniformity and repeatability. The prepreg is of uniform thickness and each part coming out of the mold may theoretically be the same. Vacuum bagging technology may have some errors in processing, but prepreg ensures production consistency.
Reduce curing time. After the thermal curing cycle, no need to wait for the standard 48 hours can be fully cured.
Aesthetics. Although prepreg processing still requires mold preparation and demoulding, prepreg processing eliminates air bubbles, makes it easier to obtain a smooth, glossy surface as well as eliminates any seaming lines.

We offer free tracked shipping on all orders within mainland EU. Orders to remote areas such as Malta, Cyprus, and Iceland may incur a surcharge. Worldwide shipping is also available—please contact us for a quote.

Most orders dispatch within one business day (Monday to Friday). EU delivery takes 3–5 working days from dispatch, and tracking details will be provided via email once your order has shipped.

Please note that import taxes may apply outside the EU, and these are the responsibility of the buyer. Some items may ship directly from our suppliers and may have varying delivery times. If an item is out of stock, we will contact you to discuss the available options.

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RETURNS

Changed your mind? You can return unused, uninstalled items in original packaging within 30 days of delivery. Return shipping is the customer’s responsibility unless the item is faulty.

Custom, used, or built-to-order items are non-returnable.

Once we receive and inspect your return, refunds are typically processed within 10 business days.

If your item is damaged or incorrect, contact us within 48 hours with photos and order details.

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WARRANTY

All VA and VA Motorsports products come with a 1-year limited warranty covering manufacturing defects and fitment issues. For third-party items, warranty terms vary by brand—please check the product listing or contact us for details.

This warranty does not cover wear and tear, incorrect installation, cosmetic damage, labor, or third-party costs.

To start a claim, email us with your order number, issue description, and photos. If the claim is approved, we’ll offer a replacement, store credit, or a refund.

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