{"product_id":"stage-2-s63-high-performance-engine-tu4-bmw-m5-m8","title":"Stage 2 S63 High Performance Engine (TU4) | BMW M5\/M8","description":"\u003cp\u003e\u003cspan data-contrast=\"none\" lang=\"EN-US\" class=\"TextRun SCXW150768990 BCX0\" xml:lang=\"EN-US\"\u003e\u003cspan class=\"NormalTextRun SCXW150768990 BCX0\"\u003e\u003cmeta charset=\"utf-8\"\u003eStage 2 S63 TU4 High Performance Engine: F90 M5, F91, F92, F93 M8\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan data-contrast=\"none\" lang=\"EN-US\" class=\"TextRun SCXW150768990 BCX0\" xml:lang=\"EN-US\"\u003e\u003cspan class=\"NormalTextRun SCXW150768990 BCX0\"\u003eThis S63 engine is designed to make for maximum power applications (over 1,000HP) \u003c\/span\u003e\u003cspan class=\"NormalTextRun SpellingErrorV2Themed SCXW150768990 BCX0\"\u003eCarBahn\u003c\/span\u003e\u003cspan class=\"NormalTextRun SCXW150768990 BCX0\"\u003e has designed a high-performance engine to handle \u003c\/span\u003e\u003cspan class=\"NormalTextRun SCXW150768990 BCX0\"\u003every high\u003c\/span\u003e\u003cspan class=\"NormalTextRun SCXW150768990 BCX0\"\u003e outputs by pinning the cam sprocket to the crankshaft. To ensure durability we also machine the block to accommodate a full circle thrust main. In addition, we \u003c\/span\u003e\u003cspan class=\"NormalTextRun SCXW150768990 BCX0\"\u003eutilize\u003c\/span\u003e\u003cspan class=\"NormalTextRun SCXW150768990 BCX0\"\u003e higher quality racing Carrillo connecting rods, forged CP pistons, cylinder head studs, high performance valve springs, cylinder head porting and lowered compression for increased flow and high boost\u003c\/span\u003e\u003cspan class=\"NormalTextRun SCXW150768990 BCX0\"\u003e.\u003c\/span\u003e\u003c\/span\u003e\u003cspan data-ccp-props='{\"201341983\":0,\"335557856\":16777215,\"335559739\":300,\"335559740\":240}' class=\"EOP SCXW150768990 BCX0\"\u003e \u003c\/span\u003e\u003c\/p\u003e \u003cp\u003eSteve Dinan has been building high performance and racing engines for BMW since 1977, winning 11 racing championships including 3 prototype championships and two 24 Hours of Daytona. The same engine shop that builds the racing engines also builds the street car engines. These talented engineers, machinists, and builders have built hundreds of engines from OEM street rebuilds to full-blown racing engines.\u003c\/p\u003e \u003cp\u003eFrom stock, the S63 engine is not designed for a large increase in boost. CarBahn has designed a high-performance engine to handle very high outputs by utilizing higher quality racing Carrillo connecting rods and forged CP pistons.\u003c\/p\u003e \u003cp\u003eThe stock engine compression ratio is relatively high due to the Corporate Average Fuel Economy (CAFE) standards which push for consistently higher fuel economy in cars and trucks. However, this increased compression limits engine performance with higher boost settings by decreasing the size of the fuel-air charge in the combustion chamber, forcing the ignition timing to retard far below MBT (Mean Best Timing, the theoretical optimal ignition timing). Therefore, the Carbahn Autoworks S63 engine has 0.5 less compression to optimize the engine for the increased boost. In an emissions-legal street car, the lowered compression has the added benefit of reducing catalyst inlet temperatures and improved drive-ability on pump gas.\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-size: large;\"\u003e\u003cb\u003eEngine core acceptance parameters\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003eMust be complete core (factory engine, from oil pan to valve cover)\u003c\/p\u003e \u003cul\u003e \u003cli\u003eBlock must have no: \u003cul\u003e \u003cli\u003eHoles or cracks in casting\u003c\/li\u003e \u003cli\u003eHoles or crack in covers\u003c\/li\u003e \u003cli\u003eBore damage that cannot be honed out\u003c\/li\u003e \u003cli\u003eThrust surface damage\u003c\/li\u003e \u003cli\u003eJournal surfaces damage\u003c\/li\u003e \u003cli\u003eBolt hole damage that can’t be repaired\u003c\/li\u003e \u003c\/ul\u003e \u003c\/li\u003e \u003cli\u003eHeads must have no: \u003cul\u003e \u003cli\u003eHoles or cracks in casting\u003c\/li\u003e \u003cli\u003eHoles or crack in covers\u003c\/li\u003e \u003cli\u003eThrust surface damage\u003c\/li\u003e \u003cli\u003eJournal surfaces damage\u003c\/li\u003e \u003cli\u003eBolt hole damage that can’t be repaired\u003c\/li\u003e \u003c\/ul\u003e \u003c\/li\u003e \u003cli\u003eAdditional repair charges could apply for damaged items that are not normally changed during an overhaul and cannot be repaired or serviced \u003cul\u003e \u003cli\u003eValves\u003c\/li\u003e \u003cli\u003eCrankshafts\u003c\/li\u003e \u003cli\u003eCamshafts\u003c\/li\u003e \u003cli\u003eGuides\u003c\/li\u003e \u003cli\u003eValveTronic mechanism\u003c\/li\u003e \u003cli\u003eVanos mechanism\u003c\/li\u003e \u003c\/ul\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e \u003c\/p\u003e \u003cp\u003ehttps:\/\/www.youtube.com\/watch?v=WSHusoVQm8o\u003c\/p\u003e","brand":"CarBahn","offers":[{"title":"Default Title","offer_id":41597424074815,"sku":"CB463-6004","price":22995.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0046\/5770\/9120\/files\/CBB463-6003_916cac1a-d3a9-499c-8fb7-bca4edc7262a.jpg?v=1743438894","url":"https:\/\/shop.precision-sport.com\/products\/stage-2-s63-high-performance-engine-tu4-bmw-m5-m8","provider":"Precision Sport Industries","version":"1.0","type":"link"}