{"product_id":"ngk-u5405-49188","title":"NGK U5405-49188 Ignition Coil 49188 Pencil Coil [1 Output Type]","description":"\u003cp\u003e【NGK U5405-49188 Ignition Coil 49188 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 cause a discharge 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), with epoxy resin filling 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 field lines, 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 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) 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 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 number of windings in 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 required. This is currently the most commonly adopted type by automobile manufacturers.\n\u003cbr\u003eCompatible Manufacturer: Mazda\n\u003cbr\u003eCompatible Genuine Part Number: ZJ01-18-100A\n\u003cbr\u003eCompatible Models: Axela (BK5P) [2003\/10～2009\/6]｜Demio 1300 (DY3R\/DY3W) [2003\/8～2007\/6, 2002\/8～2007\/6]\/1500 (DY5R\/DY5W) [2003\/8～2007\/6, 2002\/8～2007\/6]｜Verisa (DC5R\/W) [2004\/6～]\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. Please handle the connector carefully when attaching and detaching it. Damaging the connector part can lead to poor conductivity.\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 of ignition coil as stated in this document.\n\u003cbr\u003e7. Do not use the ignition coil in this document for any purpose 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 error codes from the diagnostic (self-diagnosis\/OBD) system according to the service manual, etc., before (or after) replacing the ignition coil. 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":46119129776363,"sku":"ngk-u5405-49188","price":6868.0,"currency_code":"JPY","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1021\/9499\/files\/ngk-ignition_82a9458f-3e86-4cad-8258-996b60308ca5.jpg?v=1737445234","url":"https:\/\/bikeman.jp\/en\/products\/ngk-u5405-49188","provider":"バイクマン","version":"1.0","type":"link"}