Pulleys

Adapt Motorsport 127/133mm AC crankshaft pulley for Porsche 911 3.2 Carrera engines from 1984 onwards. CNC-machined from 7075 aluminium, it incorporates a 36-1 tooth trigger disc for crankshaft sensing in compatible EFI installations while retaining the air-conditioning drive.

Fits

• Porsche 911 3.2 Carrera engines from 1984 onwards
  Vehicles equipped with air conditioning

What This Product Does

This pulley replaces the factory steel crankshaft pulley and provides an integrated trigger pattern for a compatible crankshaft sensor. The 36-1 configuration supports the crank-position reference required when installing a suitable sequential electronic fuel-injection system.

Functions

• Provides 127 / 133mm pulley dimensions for the specified air-conditioning application
• Retains the air-conditioning drive on compatible 3.2-litre engines
• Supplies a 36-1 tooth trigger pattern for crankshaft sensing
• Supports compatible sequential EFI conversions
• Replaces the original steel pulley with a machined aluminium component

Technical Details

• Manufacturer: Adapt Motorsport
• Construction: precision CNC-machined 7075 aluminium
• Finish: black anodised for corrosion resistance and surface durability
• Pulley dimensions: 127/133mm
• Trigger pattern: 36-1 teeth
• Weight: 37% lighter than the factory pulley, according to the manufacturer

Why Replacement Matters

The pulley is intended for Porsche 911 3.2 Carrera EFI projects that require an accurate crankshaft trigger reference without removing the air-conditioning drive. Adapt Motorsport uses finite element analysis during the design process to balance component strength with reduced weight. Correct sensor positioning, pulley alignment and EFI calibration remain essential during installation.

FAQs

• Is this pulley intended for cars with air conditioning?
  Yes. It is specified for 3.2-litre engines from 1984 onwards that retain air conditioning.
• What trigger pattern does it use?
  The integrated trigger disc has a 36-1 tooth arrangement for use with a compatible crankshaft sensor.
• Can it be used for sequential EFI?
  It is designed to provide the crankshaft reference needed as part of a suitable sequential EFI conversion. The complete installation also requires compatible sensing, distributor-reference and engine-management components.
• Is it suitable for a car without air conditioning?
  This version is intended for air-conditioned applications. Adapt Motorsport offers alternative pulley arrangements for engines without air conditioning.

Related reference numbers
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AMS9050326

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Billet alloy crankshaft single belt pulley.
For cars without Air conditioning



Fits:
Porsche 911 1976-89

Diameter: 126mm

Replacement for following Porsche OE numbers 93010202801, 93010202809, 93010202804, 93010202808, 93010212602, 93010202301, 93010202303, 93010202305, 93010201704, 93010201707,

Billet Aluminum Crankshaft Pulley for Single Belt Conversion is a meticulously crafted and high-performance automotive component. Engineered from premium-quality aluminum billet, it offers superior strength and durability. This precision-designed pulley is specifically tailored for single belt conversions, providing seamless power transfer and optimal performance. Its lightweight construction ensures reduced rotational mass, resulting in improved engine responsiveness and enhanced overall driving experience. Upgrade your Porsche with this exceptional crankshaft pulley, and enjoy the perfect balance of style and functionality.


Related reference numbers
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3609001403

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Adapt Motorsport 127mm 36-1 Crank Pulley 

Upgrade the crankshaft pulley on a classic air-cooled Porsche 911 with this precision-machined Adapt Motorsport 127mm crank pulley, available in separate A/C and non-A/C configurations.

Fits:

• Porsche 911 / 911S 2.7Ltr - 1974 to 1978
• Porsche 911 Carrera 3.0Ltr - 1976 to 1977
• Porsche 911 SC - 1978 to 1983
• Porsche 911 3.2 - Carrara 1984 to 1989 (without Air Conditioning Version)

Both versions incorporate a 36-1 toothed crank trigger arrangement, providing the accurate crankshaft position reference required when converting an air-cooled Porsche engine to modern programmable electronic fuel injection. Adapt Motorsport designed the trigger pattern primarily for use with a suitable Hall-effect crankshaft sensor.

The non-A/C 127mm pulley is suitable for Porsche 911 2.7, 3.0 and 3.2 Carrera applications, while the A/C version incorporates an additional 90mm air-conditioning drive pulley.

Important: the A/C version is for early cars with the piston-style A/C compressor and is only suitable for cars up to 1983. It does not fit the 1984-onwards Porsche 911 Carrera 3.2 A/C system, which uses a larger-diameter A/C pulley. Adapt Motorsport specifically advises visually checking the pulley arrangement fitted to the engine before ordering. 

What Does the Crank Pulley Do?

The crankshaft pulley is driven directly by the engine crankshaft and provides the belt drive required for associated engine accessories.

On these classic Porsche applications, the main pulley also provides a convenient location for an accurate crankshaft position trigger when converting the engine to modern electronic management.

The A/C version adds the secondary belt groove required to drive the appropriate early air-conditioning compressor.

Integrated 36-1 Crank Trigger

Both pulley versions incorporate a 36-1 trigger pattern.

A 36-1 trigger has 36 possible tooth positions with one tooth deliberately omitted. As the crankshaft rotates, a suitable position sensor reads the passing teeth and identifies the missing-tooth reference.

This provides a compatible programmable ECU with an accurate indication of crankshaft position and engine speed.

The result is a much more suitable crankshaft reference for a modern EFI system than relying solely on the original distributor-based arrangement.

Designed for Hall-Effect Sensors

Adapt Motorsport states that the 36-1 trigger arrangement is best suited to Hall-effect sensors. 

A compatible crank sensor and correctly positioned sensor bracket are required to read the trigger wheel.

Adapt Motorsport offers a matching crank trigger sensor kit for this purpose.

Suitable for Sequential EFI Conversions

A crankshaft trigger provides the ECU with accurate crank position and engine-speed information, but fully sequential engine management also needs to establish which engine cycle each cylinder is on.

Adapt Motorsport therefore recommends combining the crank pulley with its matching distributor-drive reference and crank trigger sensor kit when building a sequential EFI system. 

With the appropriate ECU, sensors and calibration, this can provide the positional information required for modern sequential fuel injection and ignition strategies.

Precision-Machined 7075 Aluminium

The A/C pulley is precision machined from 7075 aluminium and finished in black anodising. 

7075 is a high-strength aluminium alloy commonly selected where a combination of strength and relatively low component weight is required.

Replacing an original steel pulley with a machined aluminium component can also reduce pulley mass, although the primary purpose of these Adapt Motorsport pulleys is to provide a replacement pulley with an integrated 36-1 EFI trigger system.

Campagnolo-Inspired Design

The non-A/C version has been styled after the distinctive appearance of the famous Campagnolo rally wheel. 

This gives the pulley a period motorsport-inspired appearance that complements classic 911 restomod, rally-inspired and competition engine builds while incorporating the modern 36-1 crank trigger.

Why Upgrade to a Trigger Pulley?

A crank trigger pulley becomes particularly useful when the engine is being converted from its original management system to a modern programmable ECU.

Typical reasons for installing one include:

• Programmable EFI conversion
• Sequential fuel injection
• Modern programmable ignition
• Distributor-delete conversion
• Coil-on-plug conversion
• Engine rebuild with modern management
• Restomod engine build
• Motorsport engine preparation
• More accurate crankshaft position sensing
• Replacement of the original steel crank pulley

The pulley itself does not increase engine power. Its main advantage is providing the mechanical drive function together with a precise crankshaft reference for compatible electronic engine management.

Porsche Carrera 3.2 Applications

For a Porsche 911 Carrera 3.2, the distinction is straightforward.

If the engine does not require an A/C pulley, the 127mm non-A/C version is the appropriate version covered by this listing. Adapt Motorsport lists its non-A/C pulley for 2.7, 3.0 and 3.2 engines. 

If the Carrera 3.2 retains its original-style air-conditioning system, do not use the 127/90mm early A/C version. The 1984-onwards 3.2 Carrera requires the later larger-diameter A/C pulley arrangement. 

Checks Before Ordering

Classic Porsche 911 engines frequently undergo modifications, engine swaps and air-conditioning upgrades, so model year alone should not be the only check.

Before ordering, confirm:

• Engine type
• Existing crank pulley diameter
• Whether air conditioning is fitted
• A/C compressor type
• Existing A/C pulley diameter
• Belt arrangement
• Crank sensor configuration
• ECU compatibility with a 36-1 trigger
• Sensor mounting arrangement

For an A/C-equipped car, visually checking the existing pulley and compressor arrangement is particularly important, as recommended by Adapt Motorsport. 

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

93010202809

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V-Rib Belt Crank Pulley and Tensioner Upgrade  Kit by Adapt Motorsport replaces the original V-belt arrangement while retaining the standard fan drive ratio.

Fits:

• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50

What This Product Does

This conversion uses a multi-rib belt to transfer drive to the cooling fan and alternator. The eccentric-mounted idler pulley provides controlled tension adjustment and reduces belt whip, addressing limitations that can affect the original V-belt arrangement during fast engine-speed changes, hard driving or operation with a high-current alternator.

Functions

• Transfers crankshaft rotation to the fan and alternator through a V-rib belt
• Provides precise belt-tension adjustment through the eccentric idler pulley
• Reduces belt whip during rapid changes in engine speed
• Retains the original fan drive ratio
• Provides pulley markings for base and cam timing work

Technical Details

• Precision-machined from high-grade aluminium
• Black anodised finish
• Component strength validated using finite element analysis
• Timing notches at 0, 5, 120 and 240 degrees
• Standard kit includes the V-rib crank pulley, eccentric idler pulley kit, fan pulley and fan belt
• Standard+Trigger kit adds a lightweight 36-1 crank trigger disc for a crankshaft position sensor used in EFI conversions

Symptoms Addressed

• Original V-belt being displaced during rapid engine-speed changes
• Belt slip when driving a high-current alternator
• Accelerated belt wear caused by slipping
• Excessive belt tension being used in an attempt to prevent slip
• Loss of charging voltage or cooling-fan drive following belt displacement or failure

Why Replacement Matters

A displaced or slipping fan belt can interrupt alternator and cooling-fan operation. The V-rib design increases the available belt contact area, while the adjustable idler allows tension to be set without relying on excessive belt loading that may shorten alternator-bearing life.

Kit Options

• Standard Kit: V-rib crank pulley without trigger disc, eccentric idler pulley assembly, fan pulley and fan belt.
• Standard+Trigger Kit: All Standard Kit components plus a lightweight 36-1 trigger disc for EFI crankshaft-position sensing.

FAQs

• Does this kit change the fan speed? No. The original fan drive ratio is retained.
• Is it suitable for 2.7 or 3.0 engines? No. Adapt Motorsport states that the pulleys interfere with the 2.7 and 3.0 engine consoles.
• What is the trigger option for? It adds a 36-1 crank trigger disc for a crankshaft position sensor when carrying out an EFI conversion.
• Are timing marks included? Yes. The pulleys are marked at 0, 5, 120 and 240 degrees for base and cam timing settings.

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

AMS905024

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