NGK U5097-48531 Ignition Coil 48531 Pencil Coil [1-Output Type]

【NGK U5097-48531 Ignition Coil 48531 Pencil Coil [1-Output Type]】
■Product Description
Role of the Ignition Coil
In an internal combustion engine using spark plugs, a high voltage of 20,000 to 35,000V is required to discharge electricity in the combustion chamber during the compression stroke. An ignition coil is a type of transformer that converts 12V battery voltage into the high voltage required for spark plug discharge. It basically consists of a primary coil, a secondary coil, and a core (iron core), and epoxy resin is filled into the case to ensure insulation between these parts.

Specifications
Principle of High Voltage Generation in Ignition Coils
Although there are various types of ignition coils, differing in external shape and the number of output terminals, the principle of high voltage generation is the same for all. The primary coil is connected to the battery via an igniter (switch). First, the ECU (Engine Control Unit) turns the igniter ON, allowing current to flow through the primary coil. This generates a bundle of magnetic lines of force, called magnetic flux, in the core (iron core) that acts as the axis of the primary coil, and the core (iron core) becomes an electromagnet. Afterwards, when the ECU determines the engine ignition timing, it switches the igniter to the OFF state, stopping the current to the primary coil. As a result, the core (iron core) is no longer an electromagnet, and the magnetic flux inside the core (iron core) also disappears. When the magnetic flux inside the core (iron core) suddenly disappears, a high voltage is generated in the secondary coil, which shares the same core (iron core) as its axis, due to electromagnetic induction*, in proportion to the turns ratio of the primary and secondary coils. The high voltage generated in the secondary coil causes a spark to jump across the spark plug gap, initiating the combustion of the air-fuel mixture (gasoline + air).
*A coil has the property of generating voltage when the magnetic flux passing through it changes. This voltage generation phenomenon is called electromagnetic induction.
Since the voltage generated in a coil increases proportionally to the number of turns, ignition coils generate high voltage by increasing the winding of the secondary coil.
Type: Pencil Coil [1-Output Type]
Ignition coils are directly attached to each spark plug, eliminating the need for plug wires. This is currently the most commonly adopted type by car manufacturers.
Compatible Genuine Part Number: 30520-PWA-S01

■Image Notes
*Images are for illustration purposes only. Includes products of different sizes and colors. Product design and specifications may change without notice. Please be aware of this.

■Precautions
1. Always turn off the engine before inspection or replacement.
2. Please check for any oil adherence or leakage around the plug hole. Oil adherence or leakage can cause malfunction.
3. Perform inspection and replacement according to the service manuals of each automobile manufacturer.
4. Please handle the connector carefully when attaching and detaching. Damaging the connector part can lead to poor conductivity and other issues.
5. Do not use products that have been dropped, as dropping or subjecting them to impact may cause cracks or damage to internal components.
6. Please use the correct part number ignition coil as specified in this document.
7. Do not use the ignition coil in this document for any purpose other than its intended use.
8. When storing, avoid high temperatures and humidity.
9. If the engine check (MIL) lamp illuminates, be sure to clear (reset) the diagnostic (self-diagnosis/OBD) error code according to the service manual, etc., before (or after) replacing the ignition coil. Failure to clear the error code may lead to problems such as the engine check lamp not turning off.