bushing Genuine Porsche part 90110202501

Flywheel With Starter Ring Gear, 6 Bolt Type 215mm.
The OE Match Flywheel with Starter Ring Gear, 6 Bolt Type, 215mm is a high-quality replacement drivetrain component designed to transfer engine power smoothly to the clutch and transmission while providing the engagement surface for the starter motor. Manufactured to OE specifications for fit, balance and durability, this flywheel is engineered to deliver reliable performance and factory-correct operation.  

Fits:

• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 914 (1970-1976)  

Note: early 911's might need to change the starter motor to later type (part number 901604102DX)

Featuring an integrated starter ring gear and 6-bolt mounting configuration, the flywheel serves as a critical component of the clutch and starting systems. Precision-machined to maintain proper rotational balance and clutch engagement characteristics, it helps ensure smooth engine operation, consistent clutch performance and dependable engine starting.  

What This Product Does:

• Transfers engine torque to the clutch assembly and transmission.
• Provides rotational mass to smooth engine operation.
• Supports stable idle and drivability characteristics.
• Features an integrated starter ring gear for starter motor engagement.
• Provides the friction surface for clutch engagement.
• Helps reduce drivetrain vibration and harshness.
• Maintains proper balance within the engine and drivetrain assembly.

Symptoms Of Wear Or Failure:

• Clutch vibration or shudder during engagement.
• Difficulty engaging gears smoothly.
• Excessive drivetrain vibration.
• Starter motor engagement problems.
• Grinding noises during engine starting.
• Visible damage or wear to the starter ring gear teeth.
• Hot spots, scoring or cracks on the clutch friction surface.
• Premature clutch wear.
• Unusual noises from the bellhousing area.
• Reduced overall clutch and drivetrain performance.

Why Replacement Matters:

• The flywheel is subjected to constant torque loads, heat cycles, clutch friction and engine vibration throughout its service life. Over time, the friction surface can become worn, warped or heat-damaged, while the starter ring gear may suffer tooth wear from repeated starter engagement.
• A worn flywheel can negatively affect clutch performance, causing vibration, poor engagement and accelerated wear of clutch components. Damaged ring gear teeth may also lead to starter motor engagement issues, making engine starting difficult or unreliable. If left unresolved, flywheel problems can contribute to costly clutch and drivetrain repairs.
• Replacing a worn or damaged flywheel restores smooth clutch operation, reliable starter engagement and proper drivetrain performance. An OE Match replacement provides factory-style fitment, precision balancing and durable construction, ensuring dependable operation and helping preserve the driving characteristics expected from your Porsche.

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90110202602

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Flywheel Spigot Bearing.
The OE Match Flywheel Spigot Bearing also known as a pilot bearing, is a precision-engineered replacement drivetrain component designed to support and align the gearbox input shaft within the flywheel or crankshaft assembly. Manufactured to OE specifications for fit, performance and durability, this small but critical bearing helps ensure smooth clutch operation, accurate gearbox alignment and reliable transmission performance.  

Fits:

• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC  

Diagram Ref No 4

Constructed from high-quality bearing materials and engineered to withstand continuous rotational forces, vibration and temperature fluctuations, the spigot bearing reduces friction between the engine and transmission assemblies. Proper operation of this component is essential for smooth gear changes and long-term drivetrain reliability.  

What This Product Does:

• Supports and centres the gearbox input shaft.
• Maintains correct alignment between the engine and transmission.
• Reduces friction between rotating drivetrain components.
• Allows smooth rotation of the transmission input shaft.
• Helps ensure smooth clutch engagement and disengagement.
• Minimises wear on gearbox and clutch components.
• Contributes to reliable drivetrain operation and longevity.

Symptoms Of Wear Or Failure:

• Squealing, whining or grinding noises from the bellhousing area.
• Noise that changes when the clutch pedal is operated.
• Difficulty engaging gears, particularly first or reverse.
• Transmission input shaft vibration.
• Clutch drag or incomplete clutch disengagement.
• Rough or inconsistent gear changes.
• Excessive wear on the clutch disc or gearbox input shaft.
• Increased drivetrain vibration.
• Premature wear of associated transmission components.

Why Replacement Matters:

• The flywheel spigot bearing operates continuously whenever the engine is running and plays a vital role in maintaining proper alignment between the engine and gearbox. Over time, bearing surfaces can wear, lubrication can deteriorate and contamination may affect bearing performance, leading to increased friction and misalignment.
• A worn spigot bearing can cause difficult gear selection, clutch disengagement issues and accelerated wear of the gearbox input shaft and clutch components. If left unresolved, bearing failure may lead to costly transmission repairs and reduced drivetrain reliability.
• Replacing a worn flywheel spigot bearing restores proper gearbox alignment, improves clutch and transmission operation and helps protect surrounding drivetrain components from premature wear. An OE Match replacement provides factory-style fitment, precision manufacturing and dependable long-term durability, ensuring smooth performance and reliable operation for your Porsche.

Related reference numbers
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90110202501

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Lightweight Aluminium Flywheel.

Fits:
Porsche 911 2.0L 1965-69 with 901 Gearbox

Features:
• Light-weight for improved performance and drastically reduced M.O.I. (Moment of Inertia)
• Replaceable heat shield (friction surface), no need to surface flywheel
• OEM clutches bolt on for easy installation
• High tolerance manufacturing to insure a perfect hassle free installation
• Designed for normal street use for every day performance enthusiasts
• Stepped dowel pins so they are held captive by the clutch cover
• Racing parts available for the professional
• Highest quality materials like 6061-T6 aluminum for the flywheel, treated steel for the heat shield and OEM quality starter ring gears
• CAD designed/ CNC machined in house for the ultimate in quality control
• One year limited warranty on production components

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106415-11

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911 (65-75) 116mm billet aluminium single belt non a/c crankshaft pulley, manufactured to use with or without our (RS-138) 36-1 trigger wheel.

Replacement for 90110201702, 91110201750.



Fits:
Porsche 911 1965-75

CNC machined from 2024 aircraft alloy, hard anodized for wear and drilled to reduce weight.

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RS-141

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Flywheel.
6 Bolt type 215mm

Fits:
Porsche 911 2.0L 1965-69 (not for 912)
Note: early 911's might need to change the starter motor to later type (part number 901604102DX)

Porsche 914 1970-76 (6 cylinder only 914-6)

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90110202602

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Flywheel spigot bearing.



Fits:
Porsche 911 (901 Gearbox)
Porsche 911 upto 1979 (915 Gearbox)

Click 'Zoom in' for large parts diagram.
Diagram ref no. 4

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90110202501

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Lightened crankshaft for steel con rods. 

Fits:
Porsche 911 2.0ltr - 1965 to 1969
Porsche 911 2.2ltr - 1970 to 1971

Notes
Conforms to FIA Appendix K
Tested to 10,000 RPM

Increasing the performance of an engine via the crankshaft does not make sense at first glance, but it is worth taking a closer look. 

The mechanical efficiency of an engine, which, together with the thermodynamic efficiency and the volumetric efficiency, determines the rated output of an engine, depends fundamentally on the diameter of the crankshaft bearings and the friction in the bearings. 

Of course, the diameter cannot be easily changed, but the friction can, which in turn depends on the bending loads and the resulting vibrations of the crankshaft. This is exactly why the use of top-quality titanium connecting rods is of little use if the resulting significantly reduced rotating masses at the connecting rod foot are not also taken into account on the counterweight side of the crankshaft. 

Because only a perfectly designed crankshaft, calculated for the connecting rod weights, actually brings with it less bearing friction due to eliminated vibrations, and thus an increase in performance. Furthermore, this crankshaft is speed-resistant up to 11,000 rpm and tested in continuous operation up to 10,000 rpm. A pleasant side effect is of course a reduced load on the crankcase and less wear. 

This crankshaft is designed utilising the latest calculation methods using CAD and FE methods (finite elements), but is still FIA legal for historic motorsport and conforms to Annex K, but is only designed for operation with steel connecting rods. The focus was on the FIA ​​regulation that " in the case of a new production, the original or the newly manufactured component may be lightened, which was exactly the case with this crankshaft. 

If you want to run this crankshaft with titanium connecting rods, use crankshaft part number 91610201600/1 which is designed for the lower rotating masses of titanium connecting rods. Failure to comply with the mass balance will sooner or later lead to the crankshaft breaking at maximum speeds. 

Furthermore, this crankshaft is an authentic replacement for every standard crankshaft of the 911 from 1965 to 1971, i.e. every 2.0ltr and 2.2ltr engine. 


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90110201101

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Flywheel with starter ring gear, Lightweight. Porsche 911 1965-68 / 914-6 70-76
6 Bolt type 215mm

Fits:
Porsche 911 2.0L 1965-69 (not for 912)
Note: early 911's might need to change the starter motor to later type (part number 901604102DX)

Porsche 914 1970-76 (6 cylinder only 914-6)

Lightweight Flywheel with starter ring for Porsche 911 65 - 69

The flywheel with starter ring is an important component in the drive system of a vehicle, including the Porsche 911 from 1965 to 1969. This component has a crucial function in starting the engine.

The flywheel is a round plate that is connected to the crankshaft bearing. It serves as a support for the starter ring, which in turn is connected to the vehicle's starter motor. The starter ring consists of a series of teeth or cams that allow it to mesh with the starter motor. When the driver turns the ignition key, the starter motor is activated and engages the starter ring to turn the crankshaft and start the engine.

The flywheel with starter ring for Porsche 911 from 1965 to 1969 is specially designed and manufactured for these model years. It is made of high quality material to ensure reliable performance and durability. The starter ring is precision manufactured to provide a secure and smooth connection with the starter motor.

When servicing or repairing the drive system of a 1965 to 1969 Porsche 911, it may be necessary to inspect or replace the flywheel with starter ring. Damage or signs of wear can impair the performance of the starter or lead to starting problems. In such cases, it is advisable to replace the defective component with a high-quality spare part to restore optimum engine function.

The flywheel with starter ring is an important element for the smooth starting of the engine of a Porsche 911 from 1965 to 1969. By regular maintenance and the use of high-quality spare parts, car owners can ensure the reliability of their vehicle and improve the driving experience.

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90110202602

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Standard Size Crankshaft (STD)
The standard size (STD) engine crankshaft is an essential rotating component for the early air-cooled Porsche models.

Fits:

• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 914-6 2.0L (1970-1976)

These first-generation air-cooled flat-six engines rely heavily on the strength, balance and accuracy of the crankshaft to deliver the smooth, free-revving performance that made the classic 911 legendary.

Whether performing a true-to-original restoration or a full bottom-end rebuild, this crankshaft ensures proper bearing clearances, smooth rotation and the reliability required to support both naturally aspirated and early turbocharged Porsche engines.

What the Crankshaft Does

This crankshaft plays a central role in engine operation by:

• Transforming piston movement into rotational torque to drive the transmission
  
• Maintaining exact journal sizing for correct oil film and bearing support
  
• Ensuring balanced rotation across the entire RPM range
  
• Supporting reliable lubrication through precision oil galleries
  
• Handling high load and thermal stress typical of air-cooled performance engines
  
• Providing dependable bottom-end stability for both normally aspirated and turbocharged setups

Without a properly sized and balanced crankshaft, the engine cannot run smoothly or reliably.

Why Crankshafts Can Fail

Although Porsche’s air-cooled crankshafts are renowned for durability, age, performance use and lubrication issues can lead to failure. Common causes include:

• Oil starvation causing bearing damage and journal scoring
  
• Contamination in the oil system leading to abrasive wear
  
• High-mileage fatigue resulting in stress cracks or journal out-of-round conditions
  
• Overheating reducing metallurgical strength
  
• Incorrect machining or imbalance from past rebuilds
  
• Detonation or pre-ignition placing excessive load on journals
  
• Corrosion from long storage or moisture intrusion

Symptoms can include low oil pressure, vibration, bearing noise, metal debris in the oil, or excessive crankshaft end-float.

Why You Should Replace a Worn or Damaged Crankshaft

Installing a new or precision-engineered standard size crankshaft—matched to original Porsche tolerances—provides the foundation for a reliable, long-lasting engine rebuild.

Benefits include:

• Restored bearing clearance and proper lubrication
• Smooth rotational balance and reduced engine vibration
• Improved reliability for both standard and turbocharged engines
• Protection against catastrophic bottom-end failures
• Extended lifespan for connecting rods, bearings and pistons
• Consistent performance in high-heat air-cooled environments

For early air-cooled Porsche models, the crankshaft is one of the most critical components that determines the success and durability of any engine rebuild.

Related reference numbers
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90110201101

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