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- 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 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
Adjustable Camshaft Sprocket - Precision Cam Timing Adjustment for Performance and Reliability
This adjustable camshaft sprocket is designed for Porsche
924S, 944 2.5 8V and 944 Turbo models. It allows precise adjustment of camshaft
timing to optimise torque delivery, correct timing deviation after engine work
and enhance overall driving characteristics.
Fits:
- 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 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
Diagram Ref No 17
Engineered as a direct replacement for the original cam pulley, it installs easily and includes a new key and camshaft bolt for safe assembly.
What an Adjustable Camshaft Sprocket Does
The camshaft sprocket controls the timing relationship
between the crankshaft and camshaft. By adjusting cam timing, you influence
when the valves open and close relative to piston position.
This affects:
- Torque delivery
- Throttle response
- Powerband characteristics
- Maximum horsepower
- Engine drivability
By advancing or retarding the camshaft timing, you can shift the torque band higher or lower in the RPM range depending on your intended use.
Adjustability Range and Features
- Adjustable from -4° to +5° camshaft timing
- Degree markings for accurate setting
- Original zero position retained +3° to +4° is typically ideal for most street setups
- Maximum adjustment range prevents valve-to-piston contact
- Adjustment possible while mounted on the camshaft
- No need to modify the distribution cover
- Safe to tune without a rolling road
The designed adjustment range ensures you cannot rotate the sprocket far enough to cause engine damage under normal use.
Why You May Want to Upgrade
Correct Timing After Head Work
Many Porsche 924S and 944 engines have had cylinder heads skimmed during overhaul. When material is removed, the head sits lower, slightly retarding cam timing. This adjustable sprocket allows you to correct timing precisely and restore factory performance.
Compensate for Manufacturing Variations
Even factory sprockets can vary slightly in keyway positioning. This gear allows fine correction for accurate timing alignment.
Performance Tuning
If you are running:
- A performance camshaft
- Engine modifications
- Increased boost on a Turbo
- Higher compression setup
An adjustable camshaft sprocket becomes essential for optimising performance.
Street vs Racing Setup
For street use:
Advancing the cam (+3° to +4°) increases torque in the 2000 to 3500 RPM range,
improving daily drivability and throttle response.
For racing use:
Retarding or advancing timing toward +5° can move peak torque higher in the RPM
range for greater top-end performance.
You can safely experiment and feel the difference without needing a dyno session.
Superior Construction and Durability
This sprocket uses the original toothed outer design to maintain correct belt engagement but improves the internal core strength.
Key upgrades include:
- High-quality steel core stronger than original
- Reinforced keyway to prevent tearing under load
- TriPass Yellow Special galvanised coating for corrosion resistance
- Four high-strength 10.9 M8 Allen bolts for secure clamping
- Cleanly centred for smooth rotation
The original sprocket’s common weak point was the keyway, which could fail under poor assembly or high stress. This upgraded version significantly improves durability.
Package Contents
- Adjustable camshaft sprocket
- New original key
- New camshaft bolt
- User manual (in Dutch)
Reusing old keys or bolts can lead to failure, which is why new components are supplied.
Key Benefits at a Glance
- Adjustable cam timing from -4° to +5° Safe adjustment range prevents valve damage
- Ideal after cylinder head machining Improves torque and drivability
- Suitable for street and racing use
- Stronger core and reinforced keyway
- Corrosion-resistant finish
- Direct replacement with easy assembly
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9441055451T
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
2 per engine. Price is for each.
Fits:
Porsche 986 Boxster 1997-04
Porsche 987 MKI Boxster 2005-08
Porsche 987C MKI Cayman 2005-08
Porsche 996 Carrera 1998-05
Porsche 997 MKI Carrera 2005-08
This product supersedes Porsche's old part numbers:
- 996 105 178 52
- 996 105 178 53.
Click picture for large parts diagram.
Diagram Ref No 27.
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Fits:
Porsche 986 Boxster 2.7L / 3.2L 2002-04
Porsche 987.1 Boxster 2.7L / 3.2L / 3.4L 2004-08
Porsche 987C.1 Cayman 2.7L / 3.4L 2005-08
Porsche 996 Carrera 3.6L 2001-05
Porsche 997.1 Carrera 3.6L / 3.8L 2004-08
Click 'Zoom in' for large parts diagram.
Diagram ref no 43
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610505202
The product you are viewing cross references to these numbers