{"product_id":"ngk-u5147-48397","title":"NGK U5147-48397 Ignition Coil 48397 Pencil Coil [1 Output Type]","description":"\u003cp\u003e【NGK U5147-48397 Ignition Coil 48397 Pencil Coil [1-Output Type]】\n\u003cbr\u003e■Product Description\n\u003cbr\u003eThe Role of Ignition Coils\n\u003cbr\u003eIn internal combustion engines that use 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\u003eHigh Voltage Generation Principle of Ignition Coils\n\u003cbr\u003eAlthough there are various types of ignition coils, differing in external shape, number of output terminals, etc., the high voltage generation principle 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 electricity to flow into the primary coil. This generates a bundle of magnetic field lines called magnetic flux in the core (iron core) which is 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) 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 winding 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 windings, ignition coils generate high voltage by increasing the number of windings in the secondary coil.\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 the type most commonly adopted by automotive manufacturers today.\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 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 leakage around the plug hole. Oil adhesion or leakage can cause malfunctions.\n\u003cbr\u003e3. Perform inspection and replacement according to the service manual of each automobile manufacturer.\n\u003cbr\u003e4. Please handle connectors carefully when attaching and detaching them. Damaging the connector part can lead to poor conductivity.\n\u003cbr\u003e5. Do not use products that have been dropped, as impacts can cause cracks or damage to internal components.\n\u003cbr\u003e6. Please use the correct ignition coil part number as specified in this document.\n\u003cbr\u003e7. Do not use the ignition coils described in this document for purposes other than their 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":46119125319915,"sku":"ngk-u5147-48397","price":6300.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1021\/9499\/files\/ngk-ignition_893b1e38-a616-4a30-8872-a3b5c8745004.jpg?v=1737445062","url":"https:\/\/bikeman.jp\/en\/products\/ngk-u5147-48397","provider":"バイクマン","version":"1.0","type":"link"}