Speed / Reference / Knock Sensors

Adapt Motorsport Sync 2 ignition reference and synchronisation sensor kit for early Porsche 911 2.7 and 3.0 engines equipped with a piston-style air-conditioning compressor. It combines a dual-sensor module with a 127/90mm crankshaft pulley and 36-1 trigger disc.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC

Visually confirm the crankshaft pulley and air-conditioning compressor arrangement fitted to the engine. Check fitment for your specific vehicle, model, year and engine before ordering.

What This Product Does

The crank sensor monitors the teeth of the 36-1 trigger disc, enabling a compatible ECU to determine crankshaft speed and position from the pulse sequence and missing-tooth reference. The second Hall-effect sensor is housed in the distributor-location module and reads a single reference tooth at half engine speed.

This reference signal occurs once during each complete four-stroke cycle, allowing the ECU to identify whether the engine is on its compression or exhaust stroke. Combining both signals supplies the position data required for sequential fuel injection and ECU-managed ignition.

Functions

• Measures crankshaft position and rotational speed
• Provides one engine-cycle synchronisation pulse per 720 degrees
• Enables sequential injection and ignition strategies with a suitable ECU
• Installs in the original distributor mounting position
• Provides digital Hall-effect sensor outputs

Technical Details

• Sync 2 module with two ZF digital Hall-effect sensors
• 127/90mm air-conditioning crankshaft pulley for parallel-end crankshafts
• 36-1 crank trigger disc
• Recommended sensor supply voltage: 8V
• Supported sensor operating supply: 5–12V
• Machined aluminium housing with an anodised finish, maintenance-free bronze bush and sealed roller bearing

Kit Contents

• Main dual-sensor body assembly
• Two ZF Hall-effect sensors
• 127/90mm crankshaft pulley and trigger disc
• Wiring, terminals and connectors for connection to the engine wiring loom

Installation Requirements

The assembly occupies the original distributor location and uses the factory distributor gear removed from the existing unit. Installation involves connecting the sensors to a compatible engine control unit, setting the correct sensor gap at the crank trigger and configuring the reference position in the ECU software.

As the original distributor is removed, the engine requires coil-on-plug ignition or another per-cylinder coil and ignition-lead arrangement in which the ECU controls each ignition event.

Why Replacement Matters

Sequential engine management needs reliable information for engine speed, crank position and the current four-stroke cycle. This kit supplies both crank and cycle-reference signals without using the original distributor to route the ignition spark, supporting conversion to compatible electronic fuel-injection and ignition control.

Important Installation Notes

• The 127/90mm pulley is intended for early piston-style air-conditioning compressor installations and is not the correct version for 1984 onwards 3.2 engines.
• On magnesium 2.7 engine cases, a small boss near the crank pulley must be trimmed or die-ground to provide clearance for the trigger disc.
• The system does not fit Porsche 964 or 993 3.6 engine cases; these require the separate 964/993 sensor solution.
• Confirm ECU compatibility, sensor supply voltage, distributor gear suitability and available pulley clearance before installation.

FAQs

• Does the kit generate both crank and cycle-reference signals?
  Yes. One sensor reads the 36-1 crank trigger, while the second provides a synchronisation pulse once every two crankshaft revolutions.
• Can the standard distributor ignition system remain in use?
  No. The sensor module installs in the distributor position, so ignition must be controlled by the ECU using coil-on-plug or another individually controlled per-cylinder arrangement.
• Is this pulley suitable for a 1984 onwards Carrera 3.2?
  No. Later 3.2 installations use a larger air-conditioning pulley diameter and require the 127/133mm version.
• Does installation on a 2.7 magnesium case require modification?
  Yes. Adapt Motorsport specifies that a small crankcase boss must be reduced to create trigger-disc clearance.

Ignition ref/sync sensor kit by Adapt Motorsport for classic Porsche engines. This Sync 2 version combines two Hall effect sensors with a 127mm crank pulley and 36-1 trigger disc for sequential fuel injection and ignition control.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50

Check fitment for your specific vehicle, engine casing, distributor gear and engine-management system before ordering.

What This Product Does

The crank-mounted sensor reads the teeth and missing-tooth reference on the 36-1 trigger disc, allowing the ECU to calculate crankshaft position and engine speed. A second sensor within the distributor-location module generates one reference pulse every 720 degrees, identifying the engine cycle so the ECU can distinguish between the compression and exhaust strokes.

Together, these signals provide the engine-position information required by a suitable aftermarket ECU to operate sequential fuel injection and ECU-controlled ignition.

Functions

• Measures crankshaft position and rotational speed.
• Provides a once-per-engine-cycle synchronisation signal.
• Supports sequential injection and ignition strategies.
• Replaces the original distributor body at its mounting location.
• Supplies digital Hall effect signals to a compatible ECU.

Technical Details

• Sync 2 dual-sensor body assembly.
• Two ZF digital Hall effect sensors.
• 127mm crank pulley for parallel-end crankshafts.
• 36-1 crank trigger disc.
• Recommended sensor supply: 8V; operating range stated by the manufacturer as 5–12V.
• Machined aluminium housing with anodised finish, maintenance-free bronze bush and sealed roller bearing.

Kit Contents

• Main two-sensor body assembly.
• Two ZF Hall effect sensors.
• 127mm crank pulley and 36-1 trigger disc.
• Wiring, terminals and connectors for integration with the vehicle wiring loom.

Installation Requirements

The module mounts in the original distributor location and reuses the factory distributor gear. Installation requires wiring to a compatible ECU, adjustment of the sensor air gap and configuration of the reference position within the ECU software.

Because this kit replaces the distributor, the engine must use coil-on-plug ignition or another arrangement with an individually controlled ignition lead for each cylinder. The ECU must control the ignition events.

Why Replacement Matters

A modern sequential engine-management system requires accurate crankshaft speed, crank position and engine-cycle information. This combined trigger and synchronisation arrangement supplies both signals without relying on the original distributor to distribute the ignition spark.

Important Notes

• This kit is not compatible with Porsche 964 or 993 3.6L engine cases; Adapt Motorsport offers a separate sensor solution for those engines.
• On 2.7L magnesium engine cases, a small boss near the crank pulley must be trimmed or die-ground to provide trigger-disc clearance.
• Confirm ECU compatibility, sensor supply voltage, distributor gear suitability and pulley clearance before installation.

FAQs

• Does the kit provide both crank and engine-cycle signals?
  Yes. One sensor reads the 36-1 crank trigger while the internal reference sensor produces one pulse every two crankshaft revolutions.
• Can the original distributor ignition arrangement be retained?
  No. The module occupies the distributor location, so ECU-controlled coil-on-plug or an individual ignition lead and coil arrangement is required.
• Does it fit Porsche 964 or 993 3.6L cases?
  No. Those engine cases require the separate 964/993 sensor product.
• Is modification required on a 2.7L engine?
  The manufacturer states that magnesium 2.7L cases require a small crankcase boss to be trimmed for trigger-disc clearance.