NGK U5081-49498 Ignition Coil 49498 Pencil Coil [1-Output Type]

【NGK U5081-49498 Ignition Coil 49498 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 35,000V 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 required for spark plug discharge. It basically consists of a primary coil, a secondary coil, and a core (iron core), with epoxy resin filling 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 differing in external shape 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 electricity to flow through the primary coil. This generates a bundle of magnetic lines of force called magnetic flux in the core (iron core), which is the axis of the primary coil, and the core (iron core) becomes 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 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*, according 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).
*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 installed directly on each spark plug, eliminating the need for spark plug wires. This type is currently the most widely adopted by automobile manufacturers.

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

■Precautions
1. Always stop the engine before inspecting or replacing parts.
2. Please check for any oil adhesion or leakage around the plug hole. Oil adhesion or leakage can cause malfunction.
3. Inspect and replace parts 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.
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 of the ignition coil specified in this document.
7. Do not use the ignition coil described in this document for purposes 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 codes according to the service manual, etc., before (or after) replacing the ignition coil. Failure to clear the error codes may lead to problems such as the engine check lamp not turning off.