NGK U5560-49655 Ignition Coil 49655 Pencil Coil [1 Output Type]

【NGK U5560-49655 Ignition Coil 49655 Pencil Coil [1-Output Type]】
■ Product Description
Role of the Ignition Coil
In internal combustion engines using spark plugs, a high voltage of 20,000 to 35,000V is required to discharge 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 fundamentally 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
Principle of High Voltage Generation in Ignition Coils
While ignition coils come in various types, differing in external shape or 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, causing current to flow through the primary coil. This generates a bundle of magnetic flux lines, called magnetic flux, in the core (iron core) around which the primary coil is wound, turning the core into an electromagnet. Subsequently, when the ECU determines the engine ignition timing, it switches the igniter OFF, 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) disappears. When the magnetic flux inside the core (iron core) suddenly disappears, a high voltage is generated in the secondary coil, which is also wound around the same core (iron core), due to electromagnetic induction*, proportional 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.
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]
Ignition coils are directly attached to each spark plug, eliminating the need for spark plug wires. This is currently the most commonly adopted type by car manufacturers.

■ Image Notes
*Images are for illustration purposes only. They may include products with different sizes and colors. Product designs 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 or leaks around the spark plug well. Oil adhesion or leaks can cause malfunctions.
3. Perform inspection and replacement according to the service manual of each automobile manufacturer.
4. Please be careful when attaching and detaching connectors. Damaging the connector can lead to poor electrical conductivity.
5. Do not use a product that has been dropped, as impact can cause cracks or damage to internal components.
6. 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. 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. Failure to clear the error codes may lead to problems such as the engine check lamp not turning off.