NGK U5165-48539 Ignition Coil 48539 Pencil Coil [Single Output Type]

【NGK U5165-48539 Ignition Coil 48539 Pencil Coil [1-Output Type]】
■Product Description
Role of Ignition Coils
In an internal combustion engine that uses 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 the 12V battery voltage into the high voltage necessary 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 components.

Specifications
High Voltage Generation Principle of Ignition Coils
While there are various types of ignition coils, differing in appearance and number of output terminals, their high voltage generation principle is all the same. The primary coil is connected to the battery via an igniter (switch). First, the ECU (Engine Control Unit) turns the igniter ON, causing current to flow through the primary coil. This generates a bundle of magnetic flux lines, called magnetic flux, in the core (iron core) that acts as the axis of the primary coil, turning the core (iron core) into an electromagnet. Subsequently, 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 between the spark plug gap, igniting the air-fuel mixture (gasoline + air).
*Coils have the property of generating voltage when the magnetic flux passing through them changes. This voltage generation phenomenon is called electromagnetic induction.
Furthermore, since the voltage generated in a coil increases in proportion to the number of turns, ignition coils increase the winding of the secondary coil to generate high voltage.
Type: Pencil coil [1-output type]
Since ignition coils are directly attached to each spark plug, plug wires are not required. This is currently the most widely adopted type by automotive manufacturers.
Compatible genuine part number: MD362913

■Image Disclaimer
*Images are for illustrative purposes only. They may include products with different sizes and colors. Product designs and specifications are subject to change without notice. Please understand.

■Precautions
1. Always perform inspection and replacement after stopping the engine.
2. Please check for any oil or leaks around the spark plug holes. Oil contamination or leaks can cause malfunctions.
3. Perform inspection and replacement according to the service manual of each automobile manufacturer.
4. Exercise caution when attaching and detaching connectors. Damaging the connector can lead to poor conductivity and other issues.
5. Do not use products that have been dropped, as dropping or impacting them may cause cracks or damage to internal components.
6. Please use the correct ignition coil part number as specified in this document.
7. Do not use the ignition coils described in this document for purposes other than their intended use.
8. When storing, avoid high temperatures and humidity.
9. When the engine check (MIL) lamp illuminates, before (or after) replacing the ignition coil, always clear (reset) the diagnostic (self-diagnosis/OBD) error codes according to the service manual or similar documentation. Failure to clear the error codes may lead to problems such as the engine check lamp not turning off.