{"product_id":"ngk-u5145-49496","title":"NGK U5145-49496 Ignition Coil 49496 Pencil Coil [1-Output Type]","description":"\u003cp\u003e【NGK U5145-49496 Ignition Coil 49496 Pencil Coil [1-output type]】\n\u003cbr\u003e■Product Description\n\u003cbr\u003eRole of the Ignition Coil\n\u003cbr\u003eIn 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), and epoxy resin is filled into the case to ensure insulation between these components.\u003c\/p\u003e\n\n\u003cp\u003eSpecifications\n\u003cbr\u003ePrinciple of High Voltage Generation in Ignition Coils\n\u003cbr\u003eThere are various types of ignition coils, differing in external shape and number of output terminals, but 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 lines of force, called magnetic flux, in the core (iron core) that acts as the axis of the primary coil, making the core (iron core) an electromagnet. Then, 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*, 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 gap of the spark plug, 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 voltage generation phenomenon is called electromagnetic induction.\n\u003cbr\u003eFurthermore, since the voltage generated in a coil increases in proportion 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 attached directly to each spark plug, so spark plug wires are not needed. This is currently the most commonly adopted type by automotive manufacturers.\u003c\/p\u003e\n\n\u003cp\u003e■Image Notes\n\u003cbr\u003e*Images are for illustration purposes only. Includes products with different sizes and colors. Product design and specifications are subject to change without notice. Please be aware.\u003c\/p\u003e\n\n\u003cp\u003e■Precautions\n\u003cbr\u003e1. Always stop the engine before inspecting or replacing.\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. Please handle connector attachment and detachment carefully. Damaging the connector part can lead to poor conductivity and 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. 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, be sure to clear (reset) the diagnostic (self-diagnosis\/OBD) error code according to the service manual, etc., 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.\u003c\/p\u003e","brand":"日本特殊陶業(NGK)","offers":[{"title":"Default Title","offer_id":46119125156075,"sku":"ngk-u5145-49496","price":5656.0,"currency_code":"JPY","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1021\/9499\/files\/ngk-ignition_f485c3d0-3835-46e1-b1cc-13146d5c07bb.jpg?v=1737445056","url":"https:\/\/bikeman.jp\/en\/products\/ngk-u5145-49496","provider":"バイクマン","version":"1.0","type":"link"}