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Porsche > 964 (911) (1989-1994) > Engine Rebuild Parts >

Connecting Rod

Connecting Rod

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DISPLAYING 17 to 19 (of 19 products)
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Connection rod nut. Porsche 911 1984>> / 964 / 993 / 996 Turbo / 997 Turbo - 99310317402, 99310317403, 93010317400, 99310317400
3
Connection rod nut. Porsche 911 1984>> / 964 / 993 / 996 Turbo / 997 Turbo
Special Order item
99310317403
Product Information
Product Information
Connection rod nut.
12 per engine. Price is for each.

porsche

Fits:
Porsche 911 1984-89
Porsche 911 (930) Turbo 1978-89
Porsche 964 1989-94
Porsche 993 1994-98
Porsche 996 Turbo / GT2 1998-05
Porsche 997 Turbo / GT2 2005-08

Click 'Zoom in' for large parts diagram.
Diagram Ref No 11.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99310317403
99310317402
99310317403
93010317400
99310317400

The product you are viewing cross references to these numbers
Connection rod nut. Porsche 911 1984>> / 964 / 993 / 996 Turbo / 997 Turbo - 313096870322, 99310317403, 99310317402, 18681, 93010317400, 99310317400
3
Connection rod nut. Porsche 911 1984>> / 964 / 993 / 996 Turbo / 997 Turbo
99310317403/1
Product Information
Product Information

Con Rod Nut 
Sold each - 12 required per car

The OE Match Con Rod Nut is a critical internal engine fastener used to secure the connecting rod cap to the connecting rod assembly. Suitable for various Porsche 911, 964, 993, 996 Turbo and 997 Turbo engines, this precision-engineered component plays a vital role in maintaining the structural integrity of the engine's rotating assembly.

Fits:

  • Porsche 911 1984-1986 3.2L
  • Porsche 911 1987-1989 3.2L G50
  • Porsche 911 1978-1989 3.3L Turbo (930)
  • Porsche 964 (911) C2 1989-93
  • Porsche 964 (911) C4 1989-93
  • Porsche 964 (911) RS 3.6L 1991-93
  • Porsche 964 (911) RS 3.8L 1991-93
  • Porsche 964 (911) TURBO 3.3L 1991-93
  • Porsche 964 (911) TURBO 3.6L 1991-93
  • Porsche 993 (911) C2 1994-97
  • Porsche 993 (911) C4 1994-97
  • Porsche 993 (911) RS 1994-97
  • Porsche 993 (911) C2S 1994-97
  • Porsche 993 (911) C4S 1994-97
  • Porsche 993 (911) TURBO 1994-96
  • Porsche 993 (911) GT2 1994-97
  • Porsche 993 (911) TURBO S 1994-97
  • Porsche 996 TURBO 2000-05
  • Porsche 996 GT2 2001-05
  • Porsche 997 MK1 TURBO 2007-09
  • Porsche 997 MK1 GT2 2007-09

Diagram Ref No 11

The connecting rod assembly is subjected to enormous forces during engine operation, particularly at high RPM. The con rod nuts must maintain precise clamping force to ensure the connecting rod cap remains securely attached under extreme combustion and inertial loads. Even the slightest loss of clamping force can result in catastrophic engine failure.

For this reason, con rod nuts are considered a critical engine rebuild component and should always be replaced during engine overhauls, connecting rod servicing or performance engine builds.

What Does a Con Rod Nut Do?

The con rod nut secures the connecting rod cap to the connecting rod body, clamping around the crankshaft journal bearing.

Its functions include:

  • Maintaining connecting rod cap security
  • Preserving bearing crush and alignment
  • Supporting crankshaft rotation
  • Withstanding high engine loads
  • Maintaining precise clamping force
  • Supporting engine reliability
  • Protecting internal engine components

The connecting rod assembly relies entirely on the integrity of its fastening hardware to survive the extreme loads generated during operation.

Why Do Con Rod Nuts Fail?

Con rod nuts are subjected to repeated tensile loads, heat cycles and vibration throughout their service life.

Common causes of failure include:

  • Metal fatigue
  • Repeated engine stress cycles
  • Overstretching during previous installation
  • Improper torque procedures
  • High mileage wear
  • Performance engine operation
  • Corrosion during storage
  • Reuse during multiple rebuilds

Many con rod nuts are designed as single-use fasteners and can lose their ability to maintain proper clamping force if reused.

When Should Con Rod Nuts Be Replaced?

Replacement is strongly recommended whenever the connecting rods are disassembled.

Typical situations include:

  • Engine rebuilds
  • Crankshaft replacement
  • Connecting rod servicing
  • Bearing replacement
  • Performance engine upgrades
  • Motorsport engine preparation
  • Full engine restoration projects
  • Preventative rebuild maintenance

As con rod nuts are relatively inexpensive compared to the cost of engine repairs, replacing them during rebuild work is considered essential best practice.

Why Replacement Matters

The con rod nut is one of the most critical fasteners within the entire engine.

Benefits of replacement include:

  • Maintains correct clamping force
  • Supports bearing integrity
  • Reduces risk of engine failure
  • Improves engine reliability
  • Protects expensive internal components
  • Essential for professional engine builds
  • Supports high-performance applications
  • Provides peace of mind during rebuilds

For air-cooled and turbocharged Porsche engines, correct connecting rod hardware is fundamental to long-term durability and performance.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99310317403
313096870322
99310317403
99310317402
18681
93010317400
99310317400

The product you are viewing cross references to these numbers
Silicone and mineral bearing grease pack, Plastigauge.
1
Silicone and mineral bearing grease pack, Plastigauge.
PLA008
Product Information
Product Information
Silicone and mineral bearing grease.

plastigauge

3G Mineral Grease: To coat journal prior to use of Plastigauge 

3G Silicone Grease: To apply to surface of shell

Lubricants to assist with the measurement of clearance in automotive bearings.

Plastigauge Precision Clearance Gauges



DISPLAYING 17 to 19 (of 19 products)
1 2
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About Connecting Rod

High-Performance Connecting Rods (Con Rods) – Strength, Precision, and Balance for Porsche Engines

Connecting rods — commonly known as con rods — form the vital link between the piston and the crankshaft, converting linear motion into rotational force. In high-performance Porsche engines, con rods endure immense stress, heat, and pressure with every revolution, making their strength, balance, and precision crucial for reliability and performance.

At Design911, we offer a range of precision-engineered connecting rods designed for both classic and modern Porsche engines. Manufactured from motorsport-grade materials, these components deliver exceptional tensile strength, fatigue resistance, and dimensional accuracy — essential for high-RPM operation, rebuilds, and engine tuning projects.

What Do Connecting Rods Do?

Connecting rods are the mechanical bridge between pistons and the crankshaft, transmitting the force generated during combustion into the crank’s rotational motion.

Core Functions:

  • Convert reciprocating motion into rotation, enabling engine power output.
  • Withstand extreme pressure during every combustion cycle.
  • Maintain piston alignment and crankshaft balance at high speeds.
  • Influence engine response and rev characteristics, particularly in performance applications.

Lightweight yet durable connecting rods are critical to maintaining smooth, reliable power delivery across the RPM range.

Why Do Connecting Rods Fail?

Even with Porsche’s engineering precision, connecting rods can degrade or fail due to stress, wear, or improper lubrication — especially under performance driving conditions.

Common Causes of Failure Include:

  • Oil starvation leading to bearing failure or heat damage.
  • Over-revving or detonation causing bending or fatigue cracking.
  • Incorrect torque or clearance during rebuilds.
  • Material fatigue from age, stress, or high-mileage operation.
  • Improper lubrication causing friction wear on big-end bearings.

A failing con rod can result in catastrophic engine failure, making proactive inspection and replacement essential during rebuilds or upgrades.

Why Replace with Performance-Grade Connecting Rods?

Upgrading to high-strength connecting rods ensures your Porsche engine maintains optimal balance, durability, and performance under high stress. Whether restoring a classic flat-six or building a tuned turbocharged powerplant, precision rods provide improved reliability and smoother operation.

Key Benefits:

  • Increased strength and fatigue resistance under high-load conditions.
  • Enhanced engine response through reduced rotational mass.
  • Maintains piston-to-crank alignment for smoother operation.
  • Ideal for rebuilds, tuning, and performance upgrades.
  • Crafted from premium materials such as forged steel, billet alloy, or titanium.
  • Precision-balanced to reduce vibration and ensure even load distribution.

Motorsport-grade connecting rods deliver the perfect balance of strength and agility, ensuring your Porsche engine performs reliably — whether on the track or road.

Highlights:

  • High-performance con rods engineered for strength and endurance.
  • Manufacturer-quality fitment for seamless integration with Porsche engines.
  • Forged and billet designs available for both naturally aspirated and turbocharged models.
  • Lightweight, precision-balanced construction for maximum RPM stability.
  • Perfect for performance builds, rebuilds, and engine restorations.
  • Tested to motorsport standards for strength, fatigue, and dimensional accuracy.       

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