{"product_id":"spool-2jz-gte-91mm-en40b-crankshaft","title":"Spool Toyota 2JZ-GTE 91mm stroke crankshaft (EN40B)","description":"\u003ch2\u003eToyota 2JZ-GTE 3.2L Billet \u003cstrong\u003eEN40B\u003c\/strong\u003e 91mm Stroker Crankshaft\u003c\/h2\u003e\r\n\u003cp\u003eThe Toyota 2JZ-GTE engine in factory form features an 86 mm bore and 86 mm stroke, producing a displacement of 2997 cc.\u003c\/p\u003e\r\n\u003cp\u003eBy upgrading to the Spool 91 mm stroker crankshaft while retaining standard-length conrods and using custom pistons, engine capacity is increased significantly:\u003c\/p\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\r\n\u003cp\u003e\u003cstrong\u003e86.6 mm bore + 91 mm stroke\u003c\/strong\u003e = \u003cstrong\u003e3285 cc\u003c\/strong\u003e (↑ 288 cc)\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003e\u003cstrong\u003e87.1 mm bore + 91 mm stroke\u003c\/strong\u003e = \u003cstrong\u003e3362 cc\u003c\/strong\u003e (↑ 365 cc)\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003cp\u003eThis increase in cubic capacity delivers substantial gains in torque and drivability, particularly in the low-to-mid RPM range.\u003c\/p\u003e\r\n\r\n\u003ch2\u003eWhy EN40B?\u003c\/h2\u003e\r\n\u003cp\u003eThe Spool EN40B 2JZ stroker crankshaft is designed for \u003cstrong\u003eextreme power, sustained high RPM, and long-term durability\u003c\/strong\u003e in competition and high-horsepower street builds.\u003c\/p\u003e\r\n\u003cp\u003eEN40B is a \u003cstrong\u003enickel-chromium-molybdenum alloy steel\u003c\/strong\u003e, traditionally used in aerospace and motorsport applications where fatigue resistance and core strength are critical. When combined with nitriding, EN40B offers exceptional surface hardness without compromising core toughness.\u003c\/p\u003e\r\n\u003cp\u003eThis makes it an ideal material for engines that see:\u003c\/p\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eVery high cylinder pressures\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eSustained high RPM\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eDrag, roll racing, circuit, and extreme street use\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch2\u003eTrue Billet Construction\u003c\/h2\u003e\r\n\u003cp\u003eThe Spool EN40B 2JZ stroker crankshaft is a \u003cstrong\u003etrue billet crankshaft\u003c\/strong\u003e, fully CNC-machined from \u003cstrong\u003esolid EN40B core stock\u003c\/strong\u003e.\u003c\/p\u003e\r\n\u003cp\u003eThis is \u003cstrong\u003enot\u003c\/strong\u003e a cast or forged blank that has been finish-machined.\u003c\/p\u003e\r\n\u003cp\u003eManufacturing process:\u003c\/p\u003e\r\n\u003col\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eCNC-machined from EN40B billet core stock\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eHeat treated\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003ePrecision nitrided for surface hardness and wear resistance\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eFinal ground and fully balanced\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003c\/ol\u003e\r\n\u003cp\u003eThe result is a crankshaft with exceptional dimensional stability, strength, and fatigue life.\u003c\/p\u003e\r\n\r\n\u003ch2\u003ePerformance Benefits\u003c\/h2\u003e\r\n\u003cp\u003eWith the increased displacement provided by the 91 mm stroke, engines typically experience:\u003c\/p\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eUp to \u003cstrong\u003e50% gains in torque\u003c\/strong\u003e (application dependent)\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eStronger \u003cstrong\u003elow and mid-range power\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003e\u003cstrong\u003eEarlier boost onset\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eIncreased peak power potential\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eImproved overall engine response\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003cp\u003eThis makes the EN40B stroker crank particularly well-suited to large-frame turbo applications where spool and torque are critical.\u003c\/p\u003e\r\n\r\n\u003ch2\u003eEN40B vs 4340 – Material Comparison\u003c\/h2\u003e\r\n\r\n\r\n\u003ctable\u003e\r\n\u003cthead\u003e\r\n\u003ctr\u003e\r\n\u003cth\u003eFeature\u003c\/th\u003e\r\n\u003cth\u003eEN40B Billet Steel\u003c\/th\u003e\r\n\u003cth\u003e4340 Billet Steel\u003c\/th\u003e\r\n\u003c\/tr\u003e\r\n\u003c\/thead\u003e\r\n\u003ctbody\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eTypical Use\u003c\/td\u003e\r\n\u003ctd\u003eMotorsport \/ Aerospace\u003c\/td\u003e\r\n\u003ctd\u003ePerformance Automotive\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eCore Strength\u003c\/td\u003e\r\n\u003ctd\u003eExcellent\u003c\/td\u003e\r\n\u003ctd\u003eVery Good\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eFatigue Resistance\u003c\/td\u003e\r\n\u003ctd\u003e\u003cstrong\u003eExceptional\u003c\/strong\u003e\u003c\/td\u003e\r\n\u003ctd\u003eVery Good\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eNitriding Response\u003c\/td\u003e\r\n\u003ctd\u003e\u003cstrong\u003eOutstanding\u003c\/strong\u003e\u003c\/td\u003e\r\n\u003ctd\u003eGood\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eSurface Hardness (Post-Nitride)\u003c\/td\u003e\r\n\u003ctd\u003e\u003cstrong\u003eVery High\u003c\/strong\u003e\u003c\/td\u003e\r\n\u003ctd\u003eHigh\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eHigh RPM Stability\u003c\/td\u003e\r\n\u003ctd\u003e\u003cstrong\u003eExcellent\u003c\/strong\u003e\u003c\/td\u003e\r\n\u003ctd\u003eVery Good\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eExtreme Power Applications\u003c\/td\u003e\r\n\u003ctd\u003e\u003cstrong\u003ePreferred\u003c\/strong\u003e\u003c\/td\u003e\r\n\u003ctd\u003eSuitable\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eCost\u003c\/td\u003e\r\n\u003ctd\u003eHigher\u003c\/td\u003e\r\n\u003ctd\u003eLower\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003c\/tbody\u003e\r\n\u003c\/table\u003e\r\n\r\n\r\n\u003cp\u003e\u003cstrong\u003eSummary:\u003c\/strong\u003e\u003cbr\u003e4340 is an excellent performance crank material and suitable for many builds.\u003cbr\u003e\u003cstrong\u003eEN40B is the next step up\u003c\/strong\u003e, chosen when maximum durability, fatigue resistance, and long-term reliability under extreme loads are the priority.\u003c\/p\u003e\r\n\r\n\u003ch2\u003eCrankshaft Specifications\u003c\/h2\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eWeight: \u003cstrong\u003e23 kg\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eMaterial: \u003cstrong\u003eEN40B Billet Steel\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eStroke: \u003cstrong\u003e91 mm\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eFully Counterweighted\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003ePrecision Nitrided\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eFully Balanced\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cp\u003eDesigned for High-Boost \u0026amp; High-RPM Applications\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003c\/ul\u003e\u003ch2\u003eEngine build fitment\u003c\/h2\u003e\u003cp\u003e2JZ. Match the selected dimensions, engine generation and rotating assembly specification before machining or assembly.\u003c\/p\u003e\u003ch2\u003eInstallation and BBT workshop support\u003c\/h2\u003e\u003cp\u003eMeasure journal and thrust clearances, check block clearance and balance the complete rotating assembly. Confirm the damper, crank trigger and flywheel arrangement with your engine builder.\u003c\/p\u003e\u003cp\u003eBuilt by Boost \u0026amp; Tune is an authorised Spool Imports dealer and can assist with component selection, engine assembly and tuning requirements for your build.\u003c\/p\u003e","brand":"Spool","offers":[{"title":"Default Title","offer_id":67599359082563,"sku":"SPL-STR-2JZGTE-91MM-EN","price":5995.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/spool-5b6fe96897a7-2jz_1d046684-510b-4a07-a1ab-7d825a6e9309.png?v=1790919028","url":"https:\/\/builtbyboostandtune.com.au\/products\/spool-2jz-gte-91mm-en40b-crankshaft","provider":"BUILT BY BOOST AND TUNE","version":"1.0","type":"link"}