{"product_id":"bujia-ngk-6512-d6ha","title":"Spark plug NGK 6512 D6HA","description":"\u003cp\u003eZRP Standard Black Nitrided Intake Valves for BMW 1.8L M42 (Set of 8)\u003c\/p\u003e\n\n\u003cp\u003eZRP Standard Black Nitrided Intake Valves are designed for the BMW 1.8L M42B18 engine. Ideal for high-revving naturally aspirated engines and high-performance applications, these valves offer excellent durability, dimensional stability, and long-term reliability under demanding operating conditions.\u003c\/p\u003e\n\n\u003cp\u003eManufactured from high-quality forged stainless steel (EV8\/21-4N) in a single piece, each valve undergoes a specialized black nitriding process. This advanced surface hardening treatment diffuses nitrogen into the outer layer of the valve, significantly increasing wear and fatigue resistance, while reducing friction between the stem and guide thanks to the hardened and smoother surface.\u003c\/p\u003e\n\n\u003cp\u003eUnlike localized chrome coatings, the entire valve, including the stem and head, receives the black nitriding treatment. This ensures uniform surface protection, increased resistance to abrasion and valve seat wear, and an extended service life in high-revving applications.\u003cbr\u003e\nEach valve is precision forged, CNC machined, polished, and tip-hardened to meet strict dimensional tolerances. This guarantees precise valve seating, stable operation at high RPMs, and uniform sealing in both naturally aspirated and turbocharged engines.\u003c\/p\u003e\n\n\u003cp\u003eTechnical Specifications\u003c\/p\u003e\n\n\u003cp\u003eBase Material: High-quality stainless steel (EV8 \/ 21-4N)\u003c\/p\u003e\n\n\u003cp\u003eSurface Hardness: Nitrided layer up to approx. 800 HV\u003c\/p\u003e\n\n\u003cp\u003eManufacturing Process: Precision forged, CNC machined, polished, and tip-hardened\u003c\/p\u003e\n\n\u003cp\u003eTreatment: Full black nitriding of the valve stem and head\u003c\/p\u003e\n\n\u003cp\u003eDimensional Accuracy: Strict tolerances for concentricity, straightness, and sealing surface finish\u003c\/p\u003e\n\n\u003cp\u003eAdvantages\u003c\/p\u003e\n\n\u003cp\u003eReduced friction between stem and guide for less wear\u003c\/p\u003e\n\n\u003cp\u003eIncreased stability at high RPMs\u003c\/p\u003e\n\n\u003cp\u003eLonger service life compared to untreated stainless steel valves\u003c\/p\u003e\n\n\u003cp\u003eReliable sealing in naturally aspirated and turbocharged engines\u003c\/p\u003e\n\n\u003cp\u003eSuitable for high-performance road, track, and endurance applications\u003c\/p\u003e\n\n\u003cp\u003eAdditional Information\u003c\/p\u003e\n\n\u003cp\u003eSet Quantity: 8 valves\u003c\/p\u003e\n\n\u003cp\u003eMaterial: Black Nitride\u003c\/p\u003e\n\n\u003cp\u003eValve Size: 33.00 mm \/ 5.97 mm \/ 106.10 mm\u003c\/p\u003e\n\n\u003cp\u003eApplication: BMW 1.8L M42\u003c\/p\u003e\n\n\u003cp\u003eEngine Code: M42B18\u003c\/p\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":56970226696532,"sku":"D6HA-NGK","price":2.96,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1027\/4701\/3460\/files\/NGK_6512_cb527ec7-aeeb-411c-b49c-7c238894281f.jpg?v=1788450417","url":"https:\/\/www.thetunerlab.com\/en\/products\/bujia-ngk-6512-d6ha","provider":"Thetunerlab","version":"1.0","type":"link"}