{"product_id":"ngk-u5084-49495","title":"NGK U5084-49495 Ignition Coil 49495 Pencil Coil [1-Output Type]","description":"\u003cp\u003e【NGK U5084-49495 Ignition Coil 49495 Pencil Coil [1-Output Type]】\n\u003cbr\u003e■Product Description\n\u003cbr\u003eRole of Ignition Coils\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 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. \u003c\/p\u003e\n\n\u003cp\u003eSpecifications\n\u003cbr\u003ePrinciple of High Voltage Generation in Ignition Coils\n\u003cbr\u003eAlthough there are various types of ignition coils, differing in external appearance or 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, allowing current to flow through the primary coil. This generates a bundle of magnetic field lines called magnetic flux in the core (iron core), which acts 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 turns ratio of the primary and secondary coils. The high voltage generated in the secondary coil causes a spark to jump across the gap of the spark plug, initiating the combustion of 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\u003eFurthermore, since the voltage generated in a coil increases proportionally to 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\u003eIgnition coils are directly attached to each spark plug, eliminating the need for plug wires. This is currently the most commonly adopted type by automobile manufacturers.\u003c\/p\u003e\n\n\u003cp\u003e■Notes on Images\n\u003cbr\u003e*Images are for illustration purposes only. They may include products of different sizes or colors. Product designs and specifications are subject to change without notice. Please be aware of this. \u003c\/p\u003e\n\n\u003cp\u003e■Precautions\n\u003cbr\u003e1. Always turn off the engine before inspection or replacement.\n\u003cbr\u003e2. Please check for any oil adhesion or leakage around the plug hole. Oil adhesion or leakage can cause malfunction.\n\u003cbr\u003e3. Perform inspection and replacement according to the service manual of each automobile manufacturer.\n\u003cbr\u003e4. Exercise caution when attaching and detaching connectors. Damaging the connector part can lead to poor conductivity or other issues.\n\u003cbr\u003e5. Do not use dropped products, as dropping or impacting them may cause cracks or damage to internal components.\n\u003cbr\u003e6. Please use the correct part number ignition coil as specified in this document.\n\u003cbr\u003e7. Do not use the ignition coil in this document for purposes other than its intended use.\n\u003cbr\u003e8. When storing, avoid high temperatures and humidity.\n\u003cbr\u003e9. When the engine check (MIL) lamp illuminates, please clear (reset) the diagnostic (self-diagnosis\/OBD) error codes according to the service manual or similar, either before or after replacing the ignition coil. Failure to clear the error codes may lead to problems such as the engine check lamp remaining illuminated. \u003c\/p\u003e","brand":"日本特殊陶業(NGK)","offers":[{"title":"Default Title","offer_id":46119123779819,"sku":"ngk-u5084-49495","price":4456.0,"currency_code":"JPY","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1021\/9499\/files\/ngk-ignition_79a3d664-00cd-411a-8d4b-1de066fb0f2f.jpg?v=1737445015","url":"https:\/\/bikeman.jp\/en\/products\/ngk-u5084-49495","provider":"バイクマン","version":"1.0","type":"link"}