{"product_id":"valvulas-de-admision-zrp-std-con-acabado-de-nitruro-negro-para-audi-vw-volkswagen-4-2l-r8-32v-8v-fsi","title":"ZRP Std Black Nitride Finish Intake Valves for Audi VW Volkswagen 4.2L R8 32V 8V FSI","description":"\u003cp\u003eZRP Black Nitrided Standard Intake Valves for Audi\/VW 4.2L R8 32V FSI (Set of 16)\u003c\/p\u003e\n\n\u003cp\u003eZRP Black Nitrided Standard Intake Valves are designed for high-performance Audi and VW 4.2L FSI V8 engines, offering excellent durability, precise valve control, and reliable operation under demanding conditions. Made from high-quality one-piece forged stainless steel, these valves undergo a specialized black nitriding treatment to significantly enhance surface hardness and wear resistance.\u003c\/p\u003e\n\n\u003cp\u003eThe black nitriding treatment diffuses nitrogen into the outer layer of the valve, increasing fatigue resistance and reducing friction between the stem and guide due to a smoother surface finish. Unlike localized chrome coatings, the entire valve, including the stem and head, receives the nitrided layer, ensuring uniform protection and a long service life.\u003c\/p\u003e\n\n\u003cp\u003eEach valve is precision forged, CNC machined, polished, and tip-hardened to meet strict dimensional tolerances. This ensures consistent sealing, stable operation at high RPMs, and excellent compatibility with both naturally aspirated and supercharged engines.\u003c\/p\u003e\n\n\u003cp\u003eTechnical Features\u003c\/p\u003e\n\n\u003cp\u003eBase Material: High-quality stainless steel (EV8 \/ 21-4N)\u003c\/p\u003e\n\n\u003cp\u003eSurface Hardness: Black nitrided layer with hardness 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 valve nitriding (stem and head)\u003c\/p\u003e\n\n\u003cp\u003eDimensional Accuracy: Strict tolerances for stem concentricity, straightness, and sealing surfaces\u003c\/p\u003e\n\n\u003cp\u003eAdvantages\u003c\/p\u003e\n\n\u003cp\u003eReduced friction between stem and guide for lower wear and greater 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 both naturally aspirated and turbocharged engines\u003c\/p\u003e\n\n\u003cp\u003eSuitable for high-performance road and competition applications\u003c\/p\u003e\n\n\u003cp\u003eAdditional Information\u003c\/p\u003e\n\n\u003cp\u003eSet Quantity: 16 valves\u003c\/p\u003e\n\n\u003cp\u003eMaterial: Black Nitride\u003c\/p\u003e\n\n\u003cp\u003eValve Measurements: 33.85mm head \/ 5.98mm stem \/ 104.00mm length\u003c\/p\u003e\n\n\u003cp\u003eEngine Codes: BNS, BYH, BUJ, CAUA\u003c\/p\u003e\n\n\u003cp\u003eApplication: Audi \/ VW 4.2L V8 32V FSI (R8 \/ RS4 Gen.1)\u003c\/p\u003e","brand":"ZRP","offers":[{"title":"Default Title","offer_id":56967890534740,"sku":"VI-AUD-006-16","price":532.4,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1027\/4701\/3460\/files\/VI-AUD-006-16_9e231bf4-05a1-4203-a2cb-13566ea00e56.jpg?v=1788489263","url":"https:\/\/www.thetunerlab.com\/en\/products\/valvulas-de-admision-zrp-std-con-acabado-de-nitruro-negro-para-audi-vw-volkswagen-4-2l-r8-32v-8v-fsi","provider":"Thetunerlab","version":"1.0","type":"link"}