Distributors

12 Plug Distributor with Anti-Clockwise Rotation - Bosch Style 

Bring modern ignition control to your classic air-cooled Porsche with this advanced 12 Plug Distributor with Anti-Clockwise Rotation, manufactured in the historic style of the legendary Bosch 3.0 RSR ignition distributor. Combining authentic period-correct appearance with state-of-the-art electronic technology, this distributor is the ultimate ignition upgrade for high-performance Porsche 911 Turbo and twin-plug engine applications.

Fits:

• Porsche 911 1978-1989 3.3L Turbo (930)

Designed for enthusiasts seeking improved drivability, performance, engine protection and tuning flexibility, this distributor delivers fully programmable ignition control via Bluetooth smartphone connectivity while retaining the iconic appearance of a classic Bosch motorsport distributor.

Specifically configured as a left-rotating distributor and designed for use with two 3-pin CDI (Capacitive Discharge Ignition) units, this system is ideally suited to twin-plug Porsche engines requiring precise ignition control under both naturally aspirated and turbocharged operating conditions.

What Does the Distributor Do?

The distributor is responsible for accurately delivering ignition signals to the spark plugs at precisely the correct moment throughout the engine's operating range.

In a twin-plug Porsche engine, the distributor controls:

• Spark timing
• Ignition advance curves
• Cylinder firing sequence
• Twin-plug ignition operation
• Engine starting performance
• Engine efficiency
• Throttle response
• Combustion quality

Accurate ignition timing is essential for extracting maximum performance while maintaining reliability and engine safety.

Why Upgrade to a Programmable Distributor?

Traditional mechanical distributors rely on fixed advance mechanisms that offer limited adjustment and tuning flexibility.

This modern programmable distributor provides:

• Fully programmable ignition maps
• Smartphone Bluetooth connectivity
• Boost-sensitive ignition control
• Vacuum advance functionality
• Rev limiter programming
• Integrated immobiliser system
• Improved engine protection
• Greater tuning precision

The result is significantly greater control over engine performance across all operating conditions.

Historic Bosch RSR Appearance

Inspired by the original Bosch 3.0 RSR ignition distributor, this unit preserves the appearance of Porsche's most iconic motorsport ignition systems.

Benefits include:

• Period-correct appearance Motorsport-inspired design
• Authentic engine bay presentation
• Ideal for restorations and restomods
• Combines classic looks with modern technology

Perfect for enthusiasts seeking modern functionality without sacrificing originality.

Bluetooth Smartphone Programming

The integrated Bluetooth system allows ignition maps and distributor functions to be adjusted directly from a smartphone application.

Features include:

• Wireless ignition mapping
• Real-time adjustments
• User-friendly interface
• Quick tuning changes
• No specialist programming equipment required
• Simplified engine setup

This enables precise ignition optimisation for a wide range of engine specifications and operating conditions.

Integrated Pressure Sensor Technology

One of the distributor's most advanced features is the integrated manifold pressure sensor.

A vacuum or boost reference hose can be connected directly from the intake manifold to the distributor.

This allows:

• Vacuum advance functionality
• Boost retard functionality
• Load-sensitive ignition timing
• Improved part-throttle efficiency
• Enhanced turbocharged engine safety
• Optimised combustion characteristics

The system can overlay manifold pressure corrections onto the RPM-based ignition map for highly accurate ignition control.

Integrated Rev Limiter and Immobiliser

The distributor includes advanced engine protection and security features.

Rev Limiter

Benefits include:

• Protects against over-revving
• Safeguards expensive engine components
• Adjustable RPM settings
• Improved reliability

Immobiliser with PIN Protection

Benefits include:

• Enhanced vehicle security
• Smartphone programmable access
• Additional theft protection
• Discreet integrated functionality

Why Choose This Distributor?

This distributor delivers capabilities traditionally only available through standalone engine management systems.

Benefits include:

• Historic Bosch appearance
• Modern programmable technology
• Bluetooth smartphone control
• Vacuum advance functionality
• Turbo boost retard capability
• Twin-plug compatibility
• Integrated rev limiter
• Integrated immobiliser
• Precise ignition control
• Porsche-specific design

It represents one of the most advanced distributor-based ignition solutions available for air-cooled Porsche engines.

Distributor Block-Off & Conversion Kits for Classic Porsche 911
The Distributor Plug Kit for classic Porsche 911 covers the precise scenario where the engine’s original distributor hole is no longer used—often when converting to coil-on-plug ignition or eliminating the mechanical distributor altogether.

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
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)

Blanks off distributor hole in crankcase, highlighted in green

This high-quality kit is CNC-machined from aluminium, anodised silver, and features dual O-ring seals to ensure a secure, leak-free block-off of the distributor housing. It also incorporates a threaded pulling hole so the plug can be removed easily if future service is required. The result: a clean, visually refined engine bay appearance and a reliable closure of the distributor port, preserving oil-tight integrity and engine performance.

What the product is:
A plug kit designed specifically for the distributor bore in classic Porsche 911 engines. CNC-machined aluminium block-off plug, enhanced sealing (double O-rings), and serviceable pull-thread.

What it does:

• Seals the distributor aperture when the mechanical distributor has been removed or bypassed.
• Maintains crankcase oil integrity, prevents leaks and contamination ingress.
• Enhances engine bay aesthetics by replacing the open distributor hole with a tailored, polished plug.

Why the original part or configuration fails / needs attention:
When a distributor is removed (for example during coil-on-plug conversion), the hole becomes an unsealed opening—risking oil leakage, contamination ingress (dirt, moisture), crankcase pressure loss, or aesthetic degradation. Older distributor seals and housings may become warped, cracked or worn with age, causing leaks or reduced reliability.

Why this plug kit should be installed / replaced:

• Prevents oil leaks and contamination by securely sealing the engine block in the absence of a distributor.
• Improves engine bay appearance and presents a quality finish.
• Provides a service-friendly solution (threaded pull hole) versus a crude blanking plate or crude cap.
• If you’re converting away from a distributor or refurbishing the engine, installing this kit is a simple, low-cost upgrade to protect longevity and maintain engine integrity.
  

For enthusiasts of the classic Porsche 911 who are performing engine conversions, refurbishments, or upgrades, the Distributor Plug & Block-Off Kit category is essential. These kits are designed for scenarios where the factory mechanical distributor is removed—commonly in coil-on-plug conversions, performance builds, or restoration projects.

What these components do:

• Securely blank off the distributor aperture to maintain crankcase integrity.
• Prevent oil and vacuum/pressure leakage from the engine block.
• Ensure that modifications (such as eliminating the distributor) do not compromise engine performance or reliability.
• Provide a finished, professional engine bay look—no open holes, no unsealed ports, and no risk of contamination.

Why you should replace or install proper kits now:

• Restores or maintains crankcase seal integrity, protecting engine internals from oil and debris.
• Helps maintain correct engine pressure and lubrication environment for optimal performance.
• Minimises risk of leaks, contamination, and subsequent engine damage—especially critical on high-value classic Porsche engines.
• Enhances presentation and value of the engine bay for restoration, show or performance builds.
• Using a quality kit from Design911 ensures you’re installing parts that meet or exceed the factory fit and finish—and are tailored for your classic Porsche 911.

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

AMS9050165

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