NGK U5418-49369 Ignition Coil 49369 Pencil Coil [1-Output Type]

【NGK U5418-49369 Ignition Coil 49369 Pencil Coil [1-output type]】
■Product Description
Role of Ignition Coils
In internal combustion engines that use 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 the spark plug to 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
High Voltage Generation Principle of Ignition Coils
There are various types of ignition coils, differing in appearance and number of output terminals, but the 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 lines of force called magnetic flux in the core (iron core) that serves 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) ceases to be an electromagnet, and the magnetic flux within 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*, according to the winding ratio of the primary coil and secondary coil. 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).
*A coil has the property of generating voltage when the magnetic flux passing through it changes. This voltage generation phenomenon is called electromagnetic induction.
Furthermore, since the voltage generated in a coil increases proportionally with the number of turns, ignition coils increase the winding of the secondary coil to generate high voltage.
Type: Pencil Coil [1-output type]
Pencil coils are directly mounted on each spark plug, eliminating the need for plug wires. This is currently the most commonly adopted type by automotive manufacturers.

■Image Precautions
*The image is for illustration purposes only. It includes products of different sizes and colors. Product design and specifications are subject to change without notice. Please be aware.

■Precautions
1. Always turn off the engine before inspection or replacement.
2. Please check for any oil adhesion or leakage around the spark plug hole. Oil adhesion or leakage can cause malfunction.
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. Damage to the connector can lead to poor electrical continuity.
5. Do not use a product that has been dropped, as dropping it or subjecting it to impact 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 coil in this document for purposes other than its intended use.
8. When storing, avoid high temperatures and high humidity.
9. When the engine check (MIL) lamp illuminates, please clear (reset) the diagnostic (self-diagnosis/OBD) error code before (or after) replacing the ignition coil, in accordance with the service manual. Failure to clear the error code may lead to issues such as the engine check lamp not turning off.