{"product_id":"ngk-u5144-48394","title":"NGK U5144-48394 Ignition Coil 48394 Pencil Coil [1-Output Type]","description":"\u003cp\u003e【NGK U5144-48394 Ignition Coil 48394 Pencil Coil [1-Output Type]】\n\u003cbr\u003e■Product Description\n\u003cbr\u003eRole of Ignition Coils\n\u003cbr\u003eIn internal combustion engines using spark plugs, 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 needed for spark plug discharge. It basically consists of a primary coil, a secondary coil, and a core (iron core), with epoxy resin filled into the case between these components to ensure insulation. \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 appearance 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 field lines called magnetic flux in the core (iron core) that acts as the axis of the primary coil, and the core (iron core) becomes an electromagnet. Then, 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 within the core (iron core) also disappears. When the magnetic flux inside the core (iron core) suddenly disappears, high voltage is generated in the secondary coil, which shares the same core (iron core) axis, due to electromagnetic induction*, according to the turn ratio of the primary coil and secondary coil. 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).\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 is proportional 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 installed directly on each spark plug, so spark plug wires are not necessary. 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 designs and specifications are subject to change without notice. Please be aware.\u003c\/p\u003e\n\n\u003cp\u003e■Precautions\n\u003cbr\u003e1. Always inspect and replace after stopping the engine.\n\u003cbr\u003e2. Please check for any oil adhesion or leakage around the plug holes. Oil adhesion or leakage can cause malfunctions.\n\u003cbr\u003e3. Inspect and replace according to the service manual of each automobile manufacturer.\n\u003cbr\u003e4. Please handle the connector carefully when attaching and detaching. Damage to the connector can lead to poor conductivity or other issues.\n\u003cbr\u003e5. Dropping the product or subjecting it to impact may cause cracks or damage to internal components, so do not use a dropped product.\n\u003cbr\u003e6. Please use the correct part number of the ignition coil as described in this document.\n\u003cbr\u003e7. Do not use the ignition coil described in this document for purposes other than its intended use.\n\u003cbr\u003e8. When storing, avoid high temperatures and humidity.\n\u003cbr\u003e9. If 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":46119124664555,"sku":"ngk-u5144-48394","price":3311.0,"currency_code":"JPY","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1021\/9499\/files\/ngk-ignition_3a577d27-f6e0-4a6d-8c9d-df65e3290a4a.jpg?v=1737445050","url":"https:\/\/bikeman.jp\/en\/products\/ngk-u5144-48394","provider":"バイクマン","version":"1.0","type":"link"}