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distributor cap Genuine Porsche part 92860290200

distributor cap 92860290200
Code: 92860290200
Genuine Porsche part
distributor cap
Additional information:

• This part is brand new and unused.
• Please verify that it is 100% suitable for your specific vehicle before purchase to ensure compatibility.

Before purchasing thoroughly check part to confirm compatibility.
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The "rotor" head is attached to the top of the distributor shaft which is driven by a gear on the engine's camshaft and thus synchronized to it. This rotor is pressed against a carbon brush on the centre terminal of the distributor cap which connects to the ignition coil either through the top and wired directly to the coil in HEI systems, or via the centre terminal in points ignition systems and remotely connected to the coil.

The rotor is constructed such that the centre tab is electrically connected to its outer edge so that voltage coming in to the centre post travels through the carbon point to the outer edge of the rotor. As the camshaft rotates, the rotor spins and its outer edge passes each of the internal plug terminals to fire each spark plug.

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The "rotor" head is attached to the top of the distributor shaft which is driven by a gear on the engine's camshaft and thus synchronized to it. This rotor is pressed against a carbon brush on the center terminal of the distributor cap which connects to the ignition coil either through the top and wired directly to the coil in HEI systems, or via the center terminal in points ignition systems and remotely connected to the coil.

The rotor is constructed such that the center tab is electrically connected to its outer edge so that voltage coming in to the center post travels through the carbon point to the outer edge of the rotor. As the camshaft rotates, the rotor spins and its outer edge passes each of the internal plug terminals to fire each spark plug.

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The "rotor" head is attached to the top of the distributor shaft which is driven by a gear on the engine's camshaft and thus synchronized to it. This rotor is pressed against a carbon brush on the centre terminal of the distributor cap which connects to the ignition coil either through the top and wired directly to the coil in HEI systems, or via the centre terminal in points ignition systems and remotely connected to the coil.

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Distributor cap. Porsche 928S - 92860290200, 0290004502
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Bosch Distributor cap
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?
The distributor cap forms part of the conventional ignition system used on the Porsche 928S. High voltage from the ignition coil enters the centre of the distributor cap. As the distributor rotor turns inside the cap, it directs this voltage to each cylinder terminal in the correct firing order. From there, the voltage travels through the ignition leads to the spark plugs.

Correct distributor-cap condition is therefore essential for:
  • Reliable starting
  • Stable idle
  • Consistent spark delivery
  • Smooth acceleration
  • Correct combustion
  • Reliable high-RPM operation.

Why Replace a Worn Distributor Cap?
Distributor caps gradually deteriorate due to electrical arcing, heat, vibration and age. Common signs of wear can include:
  • 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

Even when no obvious external damage is visible, worn internal contacts can reduce the quality and consistency of the ignition spark.


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92860290200
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Product Information
Product Information

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.



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92860290200
92860290200

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