{"product_id":"u-groove-spark-plug","title":"U-Groove Spark Plug","description":"The Denso 3381 K20HR-U11 spark plug features a unique U-groove design in its ground electrode. This specialized groove allows the flame kernel to expand more freely, resulting in less flame dissipation and a larger, more robust flame front. This enhanced combustion process translates directly into improved fuel efficiency and a more responsive throttle.\n\nConstructed with a purified alumina powder insulator, this spark plug offers exceptional strength and thermal conductivity. The five-rib insulator design helps prevent flashover, ensuring reliable ignition. A copper-glass seal reliably bonds the center electrode and insulator, creating a gas-tight seal. The center electrode is made of nickel with a standard 2.5mm size, and the ground electrode is also nickel with a U-groove type and a single ground electrode.\n\nMachine-rolled threads are incorporated to prevent seizing or cross-threading during installation and removal. Each plug is 100% pre-fired to guarantee the highest quality. Key specifications include a 14mm thread diameter, 1.25mm thread pitch, gasket seat type, 26.5mm reach, and a 5\/8\" (16mm) hex size. This is a resistor-type plug with a value of 5k Ohm, and the specified gap is .043\" (1.1mm). Torque specifications vary by cylinder head material: 26-30 lb. ft. for cast iron and 15-22 lb. ft. for aluminum.","brand":"Denso","offers":[{"title":"Default Title","offer_id":52687629287736,"sku":"K20HR-U11","price":6.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/664191894.jpg?v=1784885699","url":"https:\/\/store.motormia.co\/products\/u-groove-spark-plug","provider":"MOTORMIA","version":"1.0","type":"link"}