{"product_id":"ngk-u5166-48542","title":"NGK U5166-48542 Ignition Coil 48542 Pencil Coil [1-output type]","description":"\u003cp\u003e【NGK U5166-48542 Ignition Coil 48542 Pencil Coil [1-output type]】\n\u003cbr\u003e■Product Description\n\u003cbr\u003eRole of the Ignition Coil\n\u003cbr\u003eIn an internal combustion engine 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 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.\u003c\/p\u003e\n\n\u003cp\u003eSpecifications\n\u003cbr\u003ePrinciple of High Voltage Generation in Ignition Coils\n\u003cbr\u003eWhile there are various types of ignition coils, differing in external shape, number of output terminals, etc., 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, allowing current to flow through the primary coil. This generates a bundle of magnetic field lines called magnetic flux in the core (iron core) that forms 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 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).\n\u003cbr\u003e*A coil has the property of generating voltage when the magnetic flux passing through it changes. This phenomenon of voltage generation is called electromagnetic induction.\n\u003cbr\u003eSince 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.\n\u003cbr\u003eType: Pencil Coil [1-output type]\n\u003cbr\u003eSince 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.\n\u003cbr\u003eCompatible genuine part number: 90919-02260\u003c\/p\u003e\n\n\u003cp\u003e■Image Notes\n\u003cbr\u003e*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 understand. \u003c\/p\u003e\n\n\u003cp\u003e■Precautions\n\u003cbr\u003e1. Always stop the engine before inspection or replacement.\n\u003cbr\u003e2. Please check for any oil adhesion or leaks around the spark plug holes. Oil adhesion or leaks can cause malfunctions.\n\u003cbr\u003e3. Perform inspection and replacement according to the service manual of each automobile manufacturer.\n\u003cbr\u003e4. Please be careful when attaching and detaching the connector. Damaging the connector part can lead to poor conductivity or other issues.\n\u003cbr\u003e5. Do not use products that have been dropped, as dropping or impacting them may cause cracks or damage to internal components.\n\u003cbr\u003e6. Please use the ignition coil with the correct part number as specified in this document.\n\u003cbr\u003e7. Do not use the ignition coil described in this document for any purpose other than its intended use.\n\u003cbr\u003e8. When storing, avoid high temperatures and high humidity.\n\u003cbr\u003e9. 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.\u003c\/p\u003e","brand":"日本特殊陶業(NGK)","offers":[{"title":"Default Title","offer_id":46119127154923,"sku":"ngk-u5166-48542","price":4447.0,"currency_code":"JPY","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1021\/9499\/files\/ngk-ignition_b4787c3c-dbe4-48f6-89fc-0d12c2eeed90.jpg?v=1737445123","url":"https:\/\/bikeman.jp\/en\/products\/ngk-u5166-48542","provider":"バイクマン","version":"1.0","type":"link"}