{"product_id":"koyo-performance-radiator-mazda-rx-7-1975-1985","title":"Koyo Performance Radiator Mazda RX-7 FB S3 1983-1985","description":"\u003ch2\u003eKoyo Performance Radiator – Mazda RX-7 FB S3 1983–1985\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Mazda RX-7 | FB (2D Coupe) | S3 1983–1985 incl. GSL-SE | Manual Transmission (AT requires external transmission cooler)\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e HH063146 \/ KH063144\u003c\/p\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #000;\"\u003e\u003cp\u003eThe FB RX-7 is a classic — lightweight, rotary-powered, and endlessly tuneable. But decades of engineering progress mean the factory cooling system is one area where a modern upgrade makes an immediate difference. Koyorad's HH Series 48mm radiator was built to address exactly that, featuring an ultra-high fin density core that maximises heat transfer in the FB's compact engine bay.\u003c\/p\u003e\u003cp\u003eUnlike generic replacements, this radiator is precision-engineered as a direct-fit performance upgrade for the stock OE plastic\/aluminium unit — no modifications, no fabrication, just bolt it in and drive. Koyorad has also integrated an M12 × 1.25 provision on the top tank centre for a low coolant sensor, and the design is compatible with aftermarket temperature gauge sensors via the included accessory fitting.\u003c\/p\u003e\u003cp\u003eBuilt in Koyorad's privately owned Japanese factories, every unit is hand assembled, Nocolok brazed, and TIG welded by hand using the finest aluminium available. Quality is never sacrificed for quantity.\u003c\/p\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #000;\"\u003e\u003ch3\u003eWhy Koyorad?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise Tube \u0026amp; Fin Alignment\u003c\/strong\u003e — Strict quality control ensures optimal coolant flow and maximum heat transfer efficiency across the entire core.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNocolok Furnace Brazing\u003c\/strong\u003e — All tubes, fins, headers, and brackets are bonded in a state-of-the-art Nocolok furnace, creating a structure that resists vibration, road debris, and the elements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBillet Filler Neck\u003c\/strong\u003e — Precision-machined billet filler necks are fitted to every unit for superior strength, durability, and a reliable seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOE-Specific Mounting\u003c\/strong\u003e — Application-specific mounting points for fan shrouds, inlet\/outlet hoses, and top\/bottom pins ensure a pain-free, no-modification install.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHand-Crafted Heliarc Welds\u003c\/strong\u003e — Each radiator is individually Heliarc welded by hand, creating the strongest possible aluminium-to-aluminium bond across all components.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #000;\"\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable style=\"border-collapse: collapse; width: 100%;\"\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003eHH063146 \/ KH063144\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e\u003cstrong\u003eCore Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003eHH Series — Ultra High Fin Density\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e\u003cstrong\u003eCore Thickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e48mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e\u003cstrong\u003eCore Dimensions (H × W)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e425 × 557\/567mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e\u003cstrong\u003eTube Pitch\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e55\/55 × 570mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e\u003cstrong\u003eInlet \/ Outlet Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003eØ38mm (top \u0026amp; bottom) \/ Ø17mm (overflow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003eAll Aluminium, Nocolok Brazed, Heliarc Welded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e\u003cstrong\u003eTransmission\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003eManual (AT requires external transmission cooler)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e\u003cstrong\u003eFan Shroud\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003eRetains OEM mounts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e\u003cstrong\u003eSensor Provision\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003eM12 × 1.25 low coolant sensor (top tank centre)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003eDirect bolt-in, no modifications required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #000;\"\u003e\u003ch3\u003eCross Reference\u003c\/h3\u003e\u003ctable style=\"border-collapse: collapse; width: 100%;\"\u003e\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e\u003cstrong\u003eKoyorad\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003eHH063146 \/ KH063144\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #000;\"\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003ctable style=\"border-collapse: collapse; width: 100%;\"\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px 12px; text-align: left;\"\u003eYear\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px 12px; text-align: left;\"\u003eMake\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px 12px; text-align: left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px 12px; text-align: left;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px 12px; text-align: left;\"\u003eSubmodel\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003e1983–1985\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003eMazda\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003eRX-7\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003eFB (2D Coupe)\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px 12px;\"\u003eS3 – incl. GSL-SE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #000;\"\u003e\u003cp\u003e\u003cstrong\u003eTechnical Notes:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIncludes M12 × 1.25 provision for low coolant sensor located on top tank centre.\u003c\/li\u003e\n\u003cli\u003eDoes not include emissions switch provision on driver's side bottom tank.\u003c\/li\u003e\n\u003cli\u003eAutomatic transmission vehicles will require an external transmission cooler.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #000;\"\u003e\u003cp\u003e\u003cem\u003eSold individually. Lead times may apply — contact us at Coore for availability and shipping estimates.\u003c\/em\u003e\u003c\/p\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #000;\"\u003e\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eCoore Performance \u0026amp; Aftermarket is an Authorised Australian Distributor of Koyorad Performance Radiators.\u003c\/strong\u003e\u003cbr\u003eShop with confidence — all Koyorad products sold through Coore are genuine, backed by manufacturer support, and shipped from Australia.\u003c\/p\u003e","brand":"Koyorad","offers":[{"title":"Default Title","offer_id":66757563318576,"sku":"HH063146","price":749.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/3156\/2544\/files\/s-l1600_4.webp?v=1778545656","url":"https:\/\/coore.com.au\/ja\/products\/koyo-performance-radiator-mazda-rx-7-1975-1985","provider":"Coore | Performance \u0026 Aftermarket","version":"1.0","type":"link"}