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Distributor Cap
Fits:
Porsche 928 S2 - 1984 to 1986
Kit contains
2 x Distributor cap
2 x Rotor arm
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94460225100KIT
The product you are viewing cross references to these numbers
- Porsche 928S2 4.7L 1984-86
Fits:
Porsche 928 S2 - 1984 to 1986
Kit contains
2 x Distributor cap
2 x Rotor arm
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94460225100KIT1
The product you are viewing cross references to these numbers
- Porsche 928S2 4.7L 1984-86
Fits:
Porsche 928 S4 - 1987 to 1992
Porsche 928 GT - 1989 to 1991
Porsche 928 GTS - 1992 to 1995
Kit Includes
2 x Distributor Cap
2 x Rotor Arm
Diagram ref no 16 and 19
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92860221101KIT
The product you are viewing cross references to these numbers
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
OE Match distributor cap for the supplied 928S application. It connects the distributor rotor with the ignition leads as part of the spark distribution system.
Fits
- Porsche 928 (1978-1995)=>928S 4.7L 1981-83
Check fitment for your specific vehicle (model, year, engine) before ordering.
What This Product Does
Working alongside the rotor, the cap routes high-voltage electricity towards the appropriate spark plug lead. Its insulating housing separates the electrical paths and covers the internal contacts. Damage to the housing or deterioration around the terminals can allow electricity to take an unintended path.
Functions
- Provides connection points for the ignition leads.
- Passes ignition voltage from the rotor towards the spark plugs.
- Separates the high-voltage paths within the distributor assembly.
- Shields the enclosed contacts from external contamination.
Technical Details
- Brand: OE Match.
- Component: ignition distributor cap.
- Supplied reference: 92860290200.
- Listed 928S engine specification: 4.7L.
Symptoms of Fault
- Misfiring that becomes more noticeable in damp weather.
- Uneven idling or hesitation when accelerating.
- Starting difficulty or occasional failure to start.
- Fine cracks around the lead connections.
- Dark tracking lines or evidence of electrical arcing inside.
- Oxidised, corroded or visibly eroded contacts.
Why Replacement Matters
A cracked housing, damaged insulation or deteriorated contacts can interrupt the intended ignition path. Renewal addresses cap-related faults once inspection has established the cause. Check the rotor, lead condition and connections during diagnosis: similar running problems can originate elsewhere, so symptoms alone do not confirm that the cap requires replacement.
FAQs
Does an intact exterior rule out failure?
No. Internal tracking or insulation deterioration may be present even when the outside appears undamaged.
Why can damp conditions make misfiring worse?
Moisture on contaminated insulating surfaces can make unintended electrical discharge more likely.
Should the rotor also be inspected?
Yes. Examine both components for wear and damage rather than assuming that only the cap needs attention.
Can cleaning resolve the problem?
Removing contamination may offer temporary improvement, but cleaning does not repair cracked insulation or established tracking damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92860290200
The product you are viewing cross references to these numbers
- Porsche 928S 4.7L 1981-83
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 928 1983-86
Porsche 924S 1986-88
Porsche 944 2.5/2.7L 1981-88
Porsche 944 M44.11
Porsche 944 M44.12 M249 Auto
Porsche 944 M44.52 Turbo
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94460225100
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
- Porsche 928S2 4.7L 1984-86
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12 Month Warranty
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Fits:
Porsche 928 1983-86
Porsche 924S 1986-88
Porsche 944 2.5/2.7L 1981-88
Porsche 944 M44.11
Porsche 944 M44.12 M249 Auto
Porsche 944 M44.52 Turbo
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94460225100
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
- Porsche 928S2 4.7L 1984-86
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Porsche Distributor Cap
The Distributor Cap is an essential component
of the ignition system fitted to selected Porsche 928, Porsche 924S and Porsche
944 models. Designed to distribute high-voltage electrical current from the
ignition coil to the correct spark plug via the rotor arm, the distributor cap
plays a critical role in ensuring accurate ignition timing, efficient
combustion and reliable engine performance.
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
- Porsche 928S2 4.7L 1984-86
Every time the engine runs, the distributor cap channels electrical energy to each cylinder in the correct firing order. Over thousands of miles, internal contacts can become worn, corroded or contaminated by moisture, oil vapour and carbon deposits. This deterioration can lead to poor spark delivery and a range of ignition-related issues.
Replacing a worn distributor cap helps restore optimum ignition performance, ensuring smooth engine operation, improved fuel efficiency and dependable starting in all driving conditions.
What Does a Distributor Cap Do?
The distributor cap sits on top of the distributor assembly and works together with the rotor arm to direct electrical current to each spark plug at precisely the right moment. This ensures the air-fuel mixture within each cylinder ignites correctly, allowing the engine to run smoothly and efficiently.
A healthy distributor cap is vital for:
Reliable engine starting Accurate spark distribution Smooth idle and acceleration Efficient fuel combustion Consistent engine performance Reduced risk of misfiresWhen Should a Distributor Cap Be Replaced?
Distributor caps are considered service items and should be inspected regularly as part of routine ignition system maintenance. Replacement is recommended when signs of wear, cracking, corrosion or carbon tracking are present.
Common symptoms of a failing distributor cap include:
Engine misfires Rough idle Difficult starting Loss of engine performance Hesitation under acceleration Reduced fuel economy Intermittent ignition faults Visible cracks or corrosion inside the capReplacing the distributor cap before complete failure helps prevent ignition problems and can avoid further wear to other ignition components such as spark plugs, ignition leads and ignition coils.
Features & Benefits
Suitable for selected Porsche 928, Porsche 924S and Porsche 944 models Ensures correct spark distribution to all cylinders Supports reliable ignition timing Helps reduce misfires and ignition faults Durable construction for long service life Ideal for preventative maintenance and restoration projects Direct replacement for worn or damaged original componentsMaintain the reliability and performance of your Porsche ignition system with Distributor Cap 94460225100/2 from Design911.
Porsche Distributor Caps & Ignition Components
Porsche Ignition Parts for Reliable Performance
Discover a comprehensive range of Porsche distributor caps, rotor arms, ignition leads, spark plugs and ignition system components at Design911. Whether you're maintaining a classic Porsche 924S, restoring a Porsche 944 or servicing a Porsche 928, our selection of ignition parts helps ensure reliable starting, smooth running and optimum engine performance.
The ignition system is one of the most important aspects of engine operation. Components such as distributor caps and rotors are responsible for directing electrical current to the correct cylinders, allowing the engine to fire efficiently and consistently. As these parts age, wear and contamination can reduce ignition performance, leading to misfires, hesitation and reduced fuel economy.
Regular replacement of ignition service components helps maintain engine reliability and prevents costly faults from developing.
Why Replace Porsche Distributor Caps?
Distributor caps are exposed to constant electrical activity, heat and vibration. Over time, internal contacts wear down and can develop carbon tracking or corrosion that interferes with spark delivery.
Benefits of replacing a worn distributor cap include:
Improved starting performance Smoother idle quality Reduced engine misfires Better throttle response Improved fuel efficiency Enhanced reliability for classic Porsche modelsRelated reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94460225100
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
- Porsche 928S2 4.7L 1984-86
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 928 5.0L / 5.4L
Porsche 944S2
Porsche 944S 16V 1986-88
Porsche 968 1992-95 ALL
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92860221101
The product you are viewing cross references to these numbers
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- 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
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
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12 Month Warranty
Worldwide Delivery
Engineered to meet original Porsche specifications, this replacement ensures accurate spark distribution and robust electrical connection for your engine’s ignition system.
Fits:
Porsche 928 5.0L / 5.4L
Porsche 944S2
Porsche 944S 16V 1986 - 1988
Porsche 968 1992 - 1995 ALL
• Function: The distributor cap channels high-voltage ignition current from the ignition coil through to the rotor and on to each spark plug in sequence. A high-quality cap ensures reliable ignition timing, stable idle, smooth running and consistent performance.
Over time, distributor caps degrade due to heat, carbon tracking, moisture ingress and internal erosion. A faulty cap may cause misfires, rough running, poor fuel economy or difficulty starting.
When to replace:
• If you experience misfires or erratic idle
• During ignition system overhaul or when installing new spark plug wires
• If the cap shows signs of wear, corrosion or internal tracking
Using a new cap ensures proper fitment and performance, giving you confidence in your Porsche’s ignition system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92860221101
The product you are viewing cross references to these numbers
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- 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
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 928 5.0L / 5.4L
Porsche 944S2
Porsche 944S 16V 1986-88
Porsche 968 1992-95 ALL
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92860221101
The product you are viewing cross references to these numbers
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- 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
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 928S 09/1982 - 07/1983
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92860290200
The product you are viewing cross references to these numbers
- Porsche 928S 4.7L 1981-83
Shop Securely
12 Month Warranty
Worldwide Delivery
High-quality Bosch distributor cap for the Porsche 928S 4.7L, designed as a direct replacement for Porsche OE reference 92860290200. The Bosch 0290004502 distributor cap is an essential component of the Porsche 928S ignition system, distributing the high-voltage current generated by the ignition coil to each spark plug in the correct firing sequence.
Fits:
Porsche 928S 09/1982 - 07/1983
* Engine codes: M28.11 M28.12
Always confirm the Porsche OE reference and existing ignition system before ordering, particularly on vehicles where the distributor may have been replaced during previous repairs.
A distributor cap operates continuously under high electrical voltage, engine-bay heat and vibration. As the internal contacts wear or become contaminated, ignition performance can deteriorate, potentially causing difficult starting, misfires, rough running or reduced engine performance.
Replacing a worn distributor cap with the correct Bosch component helps restore reliable spark distribution and maintain smooth operation of the 4.7-litre V8 engine.
Key Features
- Premium distributor cap manufactured by Bosch
- Bosch part number 0290004502
- Cross-reference for Porsche OE 92860290200
- Designed for Porsche 928S 4.7L applications
- Suitable for M28.11 and M28.12 engines
- Direct replacement for the original distributor cap
- Designed for accurate high-voltage distribution
- Helps maintain consistent ignition performance
- Correct fit for the original Bosch distributor system
- Ideal for routine ignition servicing or restoration work
- Sold individually
What Does the Distributor Cap Do?
- Reliable starting
- Stable idle
- Consistent spark delivery
- Smooth acceleration
- Correct combustion
- Reliable high-RPM operation.
- Difficult starting
- Engine misfires
- Rough or uneven idle
- Hesitation during acceleration
- Reduced engine performance
- Intermittent ignition faults
- Visible corrosion on the internal contacts
- Carbon tracking inside the cap
- Cracks in the cap housing
- Excessive wear or burning of the terminals
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92860290200
The product you are viewing cross references to these numbers
- Porsche 928S 4.7L 1981-83
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 928 S2 1983-86
Click picture for large parts diagram.
Diagram Ref No 7.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92860254100
The product you are viewing cross references to these numbers
- Porsche 928S2 4.7L 1984-86
Shop Securely
12 Month Warranty
Worldwide Delivery
Distributor Caps – Reliable Ignition Performance for Classic and Modern Porsche Models
Distributor caps are a key part of your Porsche’s ignition system, responsible for transferring electrical current from the distributor rotor to each spark plug in the correct firing order. This process ensures smooth combustion, efficient performance, and consistent engine power delivery.
At Design911, we supply a full range of genuine and high-quality distributor caps for Porsche models including 911, 924, 928, 944, 968, and early Boxster variants. Each cap is designed with high-grade insulation materials and precision-moulded terminals for optimal conductivity, durability, and ignition stability under all conditions.
What Do Distributor Caps Do?
The distributor cap forms the vital connection between your
Porsche’s ignition coil and spark plugs. It:
- Distributes
high-voltage current to each spark plug in the proper sequence.
- Ensures
accurate ignition timing for smooth and efficient combustion.
- Protects
internal electrical components from dust, moisture, and corrosion.
- Maintains reliable spark delivery even at high engine speeds.
Together with the rotor, the cap helps control spark precision — a critical factor in your Porsche’s engine response and fuel efficiency.
Why Do Distributor Caps Fail?
Despite their durable design, distributor caps are exposed
to heat, vibration, and electrical stress, which can cause wear over time.
Common causes of failure include:
- Cracks
or carbon tracking from prolonged use or electrical arcing.
- Corrosion
or oxidation on internal terminals.
- Moisture
or oil intrusion leading to misfires.
- Warped
or loose fitment causing uneven spark delivery.
- Age-related insulation breakdown reducing performance.
Signs of a failing distributor cap include rough idling, engine misfires, difficulty starting, or reduced power output.
Why Replace a Faulty Distributor Cap?
A damaged distributor cap can severely affect ignition performance, leading to inefficient combustion or complete engine misfiring. Replacing it restores proper spark distribution and overall engine reliability.
Benefits of replacement include:
- Restored engine smoothness and power.
- Improved cold starting and throttle response.
- Reduced misfires and fuel consumption.
- Long-lasting, manufacturer-quality performance and fitment.
All caps in our range are manufactured from high-strength, heat-resistant materials with precision-moulded contact points, ensuring superior conductivity, durability, and consistent performance across all driving conditions.
1. What does a distributor cap do in a Porsche?
A distributor cap directs high-voltage electricity
from the ignition coil to each spark plug in the correct sequence. This ensures
precise spark timing, smooth combustion, and efficient engine operation.
2. What are the symptoms of a bad distributor cap?
Common symptoms include rough idling, misfires,
hard starting, and reduced engine performance. In severe cases,
the vehicle may fail to start altogether if the cap is cracked or heavily
corroded.
3. How often should a distributor cap be replaced?
For older Porsche models, it’s recommended to inspect the
cap every 10,000–15,000 miles and replace it every 30,000–50,000
miles, or sooner if cracks, corrosion, or moisture damage are found.
4. Can I replace a distributor cap myself?
Yes — with basic tools and careful attention to spark
plug wire order, you can replace a distributor cap at home. However,
Porsche engines require precision alignment, so professional fitting is advised
for best results.
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Alternator / Generator
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Cold Start Valve
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Distributor
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Relays / Fuses
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Ignition Lead High Performance
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