NGK U5457-49408 Ignition Coil 49408 Pencil Coil [1-Output Type]

【NGK U5457-49408 Ignition Coil 49408 Pencil Coil [1-output type] 】
■Product Description
Role of the Ignition Coil
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 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
While there are various types of ignition coils with differences in appearance and number of output terminals, the principle of high voltage generation is the same for all of them. 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) that serves as the axis of the primary coil, making the core (iron core) an electromagnet. After that, when the ECU determines it's time for engine ignition, 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) 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 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).
*A coil has the property of generating voltage when the magnetic flux passing through it changes. This voltage generation phenomenon is called electromagnetic induction.
Note that since the voltage generated in a coil increases in proportion to the number of turns, ignition coils generate high voltage by increasing the winding of the secondary coil.
Type: Pencil Coil [1-output type]
Since ignition coils are directly attached to each spark plug, spark plug wires are not necessary. This is currently the most commonly adopted type by automobile manufacturers.

■Image Precautions
*Images are for illustration purposes only. They include products of different sizes and colors. Product design and specifications are subject to change without notice. Please be aware of this.

■Precautions
1. Always stop the engine before inspection or replacement.
2. Please check for any oil adherence or leakage around the plug holes. Oil adherence or leakage can cause malfunctions.
3. Perform inspection and replacement according to the service manual of each automobile manufacturer.
4. Please handle connector attachment and detachment carefully. Damaging the connector part can lead to poor conductivity and other issues.
5. Do not use a product that has been dropped, as impact can cause cracks or damage to internal components.
6. Please use the correct part number ignition coil as described 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. When the engine check (MIL) lamp illuminates, be sure to clear (reset) the diagnostic (self-diagnosis/OBD) error code according to the service manual or similar 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.