{"product_id":"radium-top-feed-primary-fuel-rail-conversion-kit-mazda-13b-re-rew-20-0445","title":"Radium Top Feed Primary Fuel Rail Conversion Kit | Mazda 13B-RE\/REW (20-0445)","description":"\u003cp\u003e\u003cstrong\u003eRotaries punish lean conditions instantly, and the primary injectors are the ones firing every single revolution.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eRadium Engineering Top Feed Primary Fuel Rail Conversion Kit for the Mazda 13B\u003c\/strong\u003e converts the primary injector positions in the rotor housings to modern top feed injection: a high flow rail for the 13B-RE and 13B-REW, anodized black for compatibility with all popular fuel types including E85, with a large internal bore supporting all necessary engine power requirements. Three 8AN ORB ports handle plumbing, the extra center port hosting accessories like the OEM fuel temperature sensor (via the 14-0421 adapter), a pressure transducer, or a Radium fuel pulse damper. Insulating phenolic spacers, washers, and stainless hardware prevent thermal energy from conducting into the fuel, and the included 14mm lower injector seats carry Viton O-rings suitable for boosted applications, compatible with or without the OEM diffusers in place. Injectors sold separately.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Feel\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eModern top feed injectors on the ports that fire every revolution of the rotors\u003c\/li\u003e\n\u003cli\u003eFueling stability for the boosted, E85 rotary builds that punish lean spikes hardest\u003c\/li\u003e\n\u003cli\u003eBoost-sealed injector bases from the Viton O-ring seats\u003c\/li\u003e\n\u003cli\u003eOEM fuel temperature sensor retained via the center port and 14-0421 adapter\u003c\/li\u003e\n\u003cli\u003eCooler fuel through phenolic isolation from housing heat\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHigh flow primary rail for the 13B-RE and 13B-REW rotary engines; converts to top feed injection\u003c\/li\u003e\n\u003cli\u003eAnodized black aluminum, large internal bore, all fuels including E85\u003c\/li\u003e\n\u003cli\u003e3x 8AN ORB ports; center port for OEM fuel temp sensor (14-0421), pressure transducer, or pulse damper\u003c\/li\u003e\n\u003cli\u003e14mm lower injector seats included, Viton O-ring sealed, compatible with or without OEM diffusers\u003c\/li\u003e\n\u003cli\u003eInsulating phenolic spacers, washers, and stainless steel hardware included\u003c\/li\u003e\n\u003cli\u003eVerified injectors: Injector Dynamics ID1050\/ID1300\/ID1700\/ID2600-XDS-34-14-14 (NOT included)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe Details\u003c\/h3\u003e\n\u003cp\u003eThe conversion's engineering lives in the seats: the OEM primary injector counterbores measure 16mm while modern injector lower O-rings standardize on 14mm, so the machined aluminum seats press into the iron ports, seal on their own O-rings, and give top feed injectors a correct 14mm home, with the design specifically accommodating the OEM fuel injector diffusers either retained or removed. Injector selection is fully documented, with the ID XDS-34-14-14 family verified as direct fitments. Plumbing runs entirely through 8AN ORB, so feed, crossover to the secondary rail, and accessories all use Radium adapter fittings selected per your system; O-rings lubricated at every step per Radium's instructions. Pairs with the 20-0447 secondary rail for the complete REW conversion.\u003c\/p\u003e\n\u003ch3\u003eKit Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1x Black anodized high flow primary fuel rail\u003c\/li\u003e\n\u003cli\u003e14mm lower injector seats with Viton O-rings\u003c\/li\u003e\n\u003cli\u003eInsulating phenolic spacers and washers, stainless steel hardware\u003c\/li\u003e\n\u003cli\u003eFuel injectors and port fittings NOT included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1992-2002 Mazda RX-7 FD3S (13B-REW)\u003c\/li\u003e\n\u003cli\u003e1990-1995 Mazda\/Eunos Cosmo (13B-RE)\u003c\/li\u003e\n\u003cli\u003eVerified: ID1050\/1300\/1700\/2600-XDS-34-14-14 injectors\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Radium Engineering","offers":[{"title":"Default Title","offer_id":43672694784067,"sku":"20-0445","price":123.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0064\/7754\/5539\/files\/radium-engineering-rad-20-0445-11953422499910_75d3bfe8-e55e-4559-b676-6aad0920a070.jpg?v=1786717126","url":"https:\/\/www.tunedbyshawn.com\/products\/radium-top-feed-primary-fuel-rail-conversion-kit-mazda-13b-re-rew-20-0445","provider":"Tuned by Shawn","version":"1.0","type":"link"}