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- Porsche 356 1950-55
Lightweight Flywheel, 180mm.
Enhance engine responsiveness and reduce rotational mass with this OE Match Lightweight 180mm Flywheel, manufactured as a direct replacement. Produced to OE-style specifications, this precision-engineered lightweight flywheel is designed to provide the correct mounting dimensions and clutch interface for compatible Porsche models while significantly reducing rotational inertia. Manufactured from high-quality forged steel, it offers exceptional strength, precise balance, and excellent resistance to thermal stress, making it an ideal choice for performance applications, engine rebuilds, maintenance, and restoration projects.
Fits:
- Porsche 356 1950-55
The flywheel is a vital component of the engine and transmission assembly, storing rotational energy and providing the friction surface for the clutch. A lightweight flywheel reduces rotational mass, allowing the engine to accelerate and decelerate more quickly for improved throttle response and a more engaging driving experience. Over time, repeated heat cycles, clutch wear, and excessive loading can cause the flywheel surface to become scored, warped, heat-spotted, or cracked, leading to clutch judder, vibration, and poor engagement. Replacing a worn flywheel restores reliable clutch operation while delivering the benefits of reduced rotating mass.
What This Product Does:
- Stores rotational energy while reducing rotating mass.
- Provides the friction surface for the clutch assembly.
- Improves engine throttle response and acceleration.
- Supports smooth clutch engagement and disengagement.
- Reduces drivetrain inertia for faster engine response.
- Replaces worn, cracked, or heat-damaged flywheels.
- Provides an OE-style fit for straightforward installation.
Symptoms Of Wear Or Failure:
- Clutch judder during take-off.
- Excessive drivetrain vibration.
- Heat spots or scoring on the flywheel surface.
- Cracks or distortion caused by overheating.
- Difficulty achieving smooth clutch engagement.
- Excessive clutch slippage despite serviceable clutch components.
- Damage identified during clutch replacement or engine overhaul.
Why Replacement Matters:
- The flywheel is fundamental to efficient power transmission between the engine and gearbox while providing the precision-machined surface required for proper clutch operation. A worn or damaged flywheel can cause clutch vibration, inconsistent engagement, premature clutch wear, and reduced drivetrain performance. A lightweight flywheel also offers the advantage of reducing rotational inertia, allowing the engine to rev more freely and respond more quickly to throttle inputs.
- Replacing a worn flywheel with this lightweight OE Match component restores dependable clutch performance while enhancing engine responsiveness and driving enjoyment. Manufactured as a direct replacement and produced to OE-style specifications, this OE Match Lightweight 180mm Flywheel provides reliable fit, exceptional strength, and long-lasting performance for Porsche maintenance, performance upgrades, repairs, and restoration projects.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
008180FW
The product you are viewing cross references to these numbers
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) RS 1994-97
- Porsche 996 GT3 MKI 1999-02
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
The OE Match Single Mass RS Flywheel is a high-performance replacement drivetrain component designed to deliver improved engine responsiveness, faster throttle reaction and enhanced driver engagement. Inspired by the lightweight flywheel configuration used in Porsche RS models, this single mass flywheel replaces heavier dual-mass or standard flywheel assemblies while maintaining OE-quality fitment and reliability.
Fits:
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) RS 1994-97
- Porsche 996 GT3 MKI 1999-02
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
Precision-machined from high-strength materials and manufactured to exacting OE specifications, the flywheel provides the critical connection between the engine crankshaft and clutch assembly. Its reduced rotational mass allows the engine to accelerate and decelerate more rapidly, delivering a more direct and responsive driving experience while maintaining durability under demanding conditions.
What This Product Does:
- Transfers engine torque to the clutch and transmission.
- Provides the friction surface for clutch engagement.
- Stores and transfers rotational energy from the crankshaft.
- Reduces rotational mass compared to heavier flywheel designs.
- Improves throttle response and engine acceleration.
- Allows the engine to gain and shed revs more quickly.
- Enhances driver engagement and performance characteristics.
- Supports smooth and reliable clutch operation.
Symptoms Of Wear Or Failure:
- Clutch judder or vibration during engagement.
- Excessive drivetrain vibration.
- Difficulty achieving smooth gear changes.
- Uneven clutch engagement or clutch chatter.
- Hot spots, scoring or cracking on the flywheel surface.
- Premature clutch wear.
- Burning clutch odours during operation.
- Rattling or knocking noises from the bellhousing area.
- Reduced throttle response and drivetrain smoothness.
- Excessive wear on associated clutch components.
Why Replacement Matters:
- The flywheel is subjected to continuous engine torque, clutch friction, heat cycles and mechanical stress throughout its service life. Over time, the clutch contact surface can become worn, warped or heat-damaged, reducing clutch efficiency and negatively affecting vehicle drivability.
- A worn flywheel can cause clutch vibration, poor engagement characteristics and accelerated wear of the clutch disc and pressure plate. Continuing to use a damaged flywheel may compromise the performance of newly installed clutch components and increase the likelihood of more extensive drivetrain repairs.
- Replacing a worn flywheel with an OE Match Single Mass RS Flywheel restores reliable clutch operation while delivering enhanced engine responsiveness and a more engaging driving experience. Precision-balanced and manufactured from durable materials, it offers factory-style fitment, long-term reliability and performance characteristics sought after by Porsche enthusiasts and performance-focused drivers.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96410223931
The product you are viewing cross references to these numbers
- 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 996 GT3 MKI 1999-02
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Restore engine sealing integrity and prevent costly oil leaks with this OE Match Rear Main Oil Seal for the Porsche 964, Porsche 993 and Porsche 996. Manufactured to OE specifications and measuring 90mm inner diameter, 110mm outer diameter and 12mm width, this critical engine seal is designed to prevent engine oil escaping around the rear of the crankshaft where it exits the engine case and connects to the flywheel assembly.
Fits:
- 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 996 GT3 MKI 1999-02
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Diagram Ref No. 21
The rear main oil seal, often referred to as the RMS (Rear Main Seal), is one of the most important sealing components in the engine. It retains engine oil inside the crankcase while allowing the crankshaft to rotate at high speed. A worn or damaged seal can lead to oil leaks, clutch contamination and unnecessary engine maintenance costs if left unattended.
This OE Match replacement provides the correct fit, sealing performance and durability required for maintenance, engine rebuilds and preventative servicing.
What Does the Rear Main Oil Seal Do?
The rear main oil seal forms a seal around the rear section of the crankshaft.
Its primary functions include:
- Preventing engine oil leaks
- Sealing the rear crankshaft opening
- Protecting the flywheel area from contamination
- Maintaining correct engine oil levels
- Preventing oil reaching the clutch assembly
- Supporting long-term engine reliability
- Allowing smooth crankshaft rotation
Without a properly functioning rear main seal, oil can escape from the engine and create a range of reliability issues.
Why Do Rear Main Oil Seals Fail?
Like all rubber sealing components, rear main oil seals are subject to wear and ageing.
Common causes of failure include:
- Heat cycling
- Age-related hardening
- Crankshaft wear
- Engine vibration
- Long-term oil exposure
- Improper installation
- Excessive crankcase pressure
- High mileage use
Over time, the sealing lip can lose flexibility and its ability to maintain consistent contact with the crankshaft surface.
Symptoms of a Failing Rear Main Oil Seal
Common warning signs include:
- Oil leaks between engine and gearbox
- Oil drips beneath the vehicle
- Oil contamination around the flywheel housing
- Clutch slip caused by oil contamination
- Burning oil smell
- Gradual oil level loss
- Oil residue on transmission bellhousing
Because the seal is located behind the flywheel, leaks can often be mistaken for other engine oil leaks unless properly diagnosed.
When Should the Rear Main Oil Seal Be Replaced?
Replacement is recommended when:
- Oil leakage is present
- The gearbox is being removed
- Replacing the clutch assembly
- Rebuilding the engine
- Refurbishing the crankshaft
- Carrying out preventative maintenance
- The original seal shows signs of ageing
- Engine mileage is high
Many Porsche specialists recommend replacing the rear main seal whenever the clutch or flywheel is removed, as labour access is significantly easier during these procedures.
Why Replacement Matters
A leaking rear main oil seal can lead to far more expensive repairs if ignored.
Benefits of replacement include:
- Prevention of engine oil leaks
- Protection of the clutch assembly
- Improved engine cleanliness
- Reduced maintenance costs
- Improved reliability
- Professional rebuild standards
- Long-term sealing performance
- Greater peace of mind
Replacing the seal during clutch or engine work is considered a smart preventative maintenance measure.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911342642
The product you are viewing cross references to these numbers
- 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 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
Fits:
Porsche 964 1990-94
Porsche 993 1995-98
Porsche 996 Turbo 2001-05
Porsche 996 GT3 2001-04
Porsche 997 Turbo 2007-10
Porsche 997 GT3 2007-11
Diagram ref no 24
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99905216900
The product you are viewing cross references to these numbers