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- 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 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
What size serpentine belt to run when using an under drive pulley?
The stock serpentine belt length for a 986 Porsche Boxster or Porsche 996 with air conditioning is 2115mm Porsche part # 996 102 151 64. If you remove the air conditioning but keep the stock drive pulley you will need a new serpentine belt that is 1930mm in length. If you then decide to add an underdrive pulley in the range of 4.25 to 5 inches in diameter you will need a belt 1905mm in length. For those of you who would like to add an under drive pulley with air conditioning, the proper length is 2101mm.
So in review:
Stock pulley w/o air conditioning - 1930mm
Under drive pulley w/o air conditioning - 1905mm
Fits:
Porsche 996 3.4L
Porsche 996 3.6L
Porsche Boxster 986
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610215198
The product you are viewing cross references to these numbers
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- 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
To help remove all the balance shaft belt and ancillary
products on 944/968 which is only way to make the engine run smoother (After
you’ve removed that stuff these bungs to plug up the holes on the engine, so it
does leak from where the shafts used to be).
So, engine will still run without all that balance shaft
belt and ancillary, maybe a bit rougher but will save a bit of engine power not
having to drive all that stuff and engine weight. (Crankshaft/Camshaft timing
is on a separate timing belt on 944/968)
Replacement Porsche part no 94410292300.
Fits:
- Porsche 944S 2.5L 16V 1987-88 M44.40 engines
- Porsche 924S 2.5L 1987-88 M44.10 engines
- Porsche 944S2 3.0L 16V 1989-91 M44.41 engines
- Porsche 944 Turbo 2.5L 8V 1987-91 M44.52 engines
- Porsche 944 Turbo S 2.5L 8V 1988>> M44.52 engines
- Porsche 968 3.0L 1992-94 M44.43 engines
- Porsche 968 Sport 3.0L 1994-95 M44.43 engines
- Porsche 968 CS 3.0L 1993-95 M44.43 engines
- Porsche 968 Turbo S 3.0L 1993-94 M44.43 engines
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
3609509441
The product you are viewing cross references to these numbers
- 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
944 2-in-1 Performance Cam Wheel (+2° / +4°)
Unlock additional performance from your Porsche 944 engine with this innovative 2-in-1 Performance Cam Wheel, engineered to optimise camshaft timing and deliver measurable improvements in both torque and horsepower. Featuring two pre-set timing advance positions (+2° and +4°) within a single camshaft sprocket, this clever design allows owners to tailor engine characteristics for either road or track use without the complexity or expense of a fully adjustable cam gear.
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
By simply rotating the cam wheel 180 degrees during installation, you can select either the +2° or +4° timing position, making this a cost-effective performance upgrade that offers greater flexibility than a standard replacement camshaft wheel.
Even better, the price is lower than many genuine replacement camshaft sprockets while delivering real-world performance gains proven on the rolling road.
Why Adjust Camshaft Timing?
The camshaft and crankshaft work together through the timing belt to control valve opening and closing events. While Porsche factory timing settings provide a good balance for production vehicles, they are often no longer optimal after years of service or engine rebuilding.
Several factors can alter the original camshaft timing:
Cylinder Head Resurfacing
During engine rebuilds, cylinder heads are often skimmed to restore flatness. Many Porsche 944 engines have had this procedure performed multiple times throughout their lives.
Each resurfacing operation slightly alters the relationship between the crankshaft and camshaft, affecting valve timing and engine efficiency.
Hydraulic Tappet Wear
Over time, natural wear and operational changes within the hydraulic tappets can influence valve timing characteristics, reducing engine responsiveness and performance.
Manufacturing Tolerances
Even when new, production tolerances can result in small variations in camshaft timing from engine to engine.
This performance cam wheel compensates for these variables by subtly repositioning the camshaft relative to the crankshaft, advancing intake valve opening events to improve cylinder filling and increase engine output.
Dyno-Proven Performance Gains
Extensive rolling road testing has demonstrated clear performance improvements over the original factory camshaft timing.
+4° Setting
The +4° position provides the greatest torque increase in the lower and mid-range rev band.
Benefits include:
- Up to 10 Nm increase in torque
- Improved acceleration
- Stronger mid-range response
- Enhanced road driving characteristics
- Improved flexibility during everyday driving
Peak gains are achieved up to approximately 5000 RPM.
+2° Setting
The +2° position also produces a significant torque increase but is optimised for higher engine speeds.
Benefits include:
- Improved upper RPM performance
- Increased peak horsepower
- Strong high-rev power delivery
- Enhanced track performance
- Improved top-end engine response
Above approximately 5000 RPM, the +2° setting delivers the strongest horsepower gains.
Which Setting Should You Choose?
+4° Position – Ideal for Road Cars
The +4° setting is recommended for:
- Fast road use
- Daily driving
- Touring
- Improved drivability
- Enhanced low and mid-range torque
This setting delivers a more responsive engine where it is used most often on the road.
+2° Position – Ideal for Track Use
The +2° setting is recommended for:
- Motorsport applications
- Track days Competition use
- High RPM operation
- Maximum peak horsepower
Drivers seeking ultimate top-end performance will benefit most from this configuration.
Simple Installation
Unlike many performance camshaft timing solutions, this cam wheel retains the original timing reference marks on both sides.
This allows:
- Straightforward installation
- Accurate timing belt alignment
- Easy selection of either timing position
- Factory-style installation procedures
The wheel is designed to fit directly in place of the original component.
Corrosion-Resistant Construction
Manufactured from steel and galvanised for corrosion protection, the cam wheel is built for long-term reliability and durability.
The kit also includes a new locating wedge to ensure accurate positioning and installation.
Package Contents
Supplied complete with:
- 1 x Galvanised Steel Performance Cam Wheel
- 1 x New Camshaft Locating Wedge
Installation Information
Approximate installation time: 1 hour Timing belt removal required Timing belt re-tensioning required after installation Ideal upgrade when replacing the timing belt Suitable to combine with routine maintenance work
Professional installation is recommended if you are unfamiliar with Porsche timing belt procedures.
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9441055451T
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