NGK U5093-48541 Ignition Coil 48541 Pencil Coil [1-output type]

【NGK U5093-48541 Ignition Coil 48541 Pencil Coil [1-Output Type]】
■ Product Description
Role of Ignition Coils
In internal combustion engines using spark plugs, a high voltage of 20,000 to 35,000 V 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 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 in the case to ensure insulation between these components.

Specifications
High Voltage Generation Principle of Ignition Coils
There are various types of ignition coils, differing in external shape, number of output terminals, etc., but 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, causing current to flow through the primary coil. This generates a bundle of magnetic field lines called magnetic flux in the core (iron core), which is the axis of the primary coil, and the core (iron core) becomes an electromagnet. Then, 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, 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.
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]
Ignition coils are installed directly on each spark plug, eliminating the need for spark plug wires. This is currently the most widely adopted type by automobile manufacturers.
Compatible genuine part number: N3H1-18-100C

■ Image Notes
*The image is for illustrative purposes only. It includes products with different sizes and colors. Product designs and specifications may change without prior notice. Please be aware of this.

■ Precautions
1. Always stop the engine before inspecting or replacing parts.
2. Please check for any oil adhesion or leakage around the spark plug hole. Oil adhesion or leakage can cause malfunctions.
3. Perform inspection and replacement according to the service manual of each automobile manufacturer.
4. Please handle the connector carefully when attaching and detaching it. Damaging the connector part can lead to poor conductivity or 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 of ignition coil listed in this document.
7. Do not use the ignition coil in this document for purposes other than its original intent.
8. When storing, avoid high temperatures and humidity.
9. When 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.