{"product_id":"au-4-0l-sohc-ross-racing-forged-pistons","title":"AU 4.0L SOHC Ross Racing Forged Piston","description":"\u003ch4\u003eRoss Racing Forged Pistons for AU 4.0L SOHC using BA Rods (22mm gudgeon pin)\u003c\/h4\u003e\r\n\r\n\u003cp\u003ePistons are available in:\u003c\/p\u003e\r\n\u003cul\u003e\r\n\u003cli\u003eCompression Ratio: 8.5:1 and 9.0:1\u003c\/li\u003e\r\n\u003cli\u003eBore Size: +0.5mm and +1mm\u003c\/li\u003e\r\n\u003cli\u003e0.200\" (5mm) Tool steel 52100 gudgeon pins\u003c\/li\u003e\r\n\u003cli\u003ePistons come with rings, gudgeon pins and pin locks\u003c\/li\u003e\r\n\u003cli\u003eForged 2618\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003cp\u003eRated at 1000HP by Ross Racing\u003c\/p\u003e\r\n\u003ch4\u003eRoss Racing Pistons:\u003c\/h4\u003e\r\n\u003cp\u003eAll ROSS Racing Pistons (since 1985) have been forged from 2618 billet bar stock and have been heat treated and aged to a T61 condition (2618-T61). 2618-T61 is the material that is used when fatigue resistance and durability are of prime importance by all premium racing piston manufacturers.\u003c\/p\u003e\r\n\u003cp\u003eThis material has less than 1% silicon particulate content. High silicon content pistons (forged from 4032 or MS75) will not stand up to the most extreme stress placed on many racing pistons. If a crack starts to form in a high silicon piston it will continue until the piston experiences a catastrophic failure. Simply stated, adding sand to the aluminum only makes it more brittle. In the rare instance of a 2618-T61 piston cracking, the crack will continue to an area where the stress is not as great and will then stop. Another advantage of 2618-T61 over the high silicon pistons is the ability to keep its shape under extreme pressure and high RPM's. \"Skirt Shrinking\" is not a problem with ROSS Racing Pistons.\u003c\/p\u003e\u003ch2\u003eAvailable options\u003c\/h2\u003e\u003cul\u003e\u003cli\u003ePiston Diameter: +.5mm \/ 8.5:1; +.5mm \/ 9:1; +1mm \/ 9:1\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eEngine build fitment\u003c\/h2\u003e\u003cp\u003eford-ea-au-sohc. 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\u003eConfirm finished bore size, piston-to-wall clearance, compression height, pin specification, ring gaps and valve clearance against the supplied piston documentation.\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":"Ross Racing Pistons","offers":[{"title":"+.5mm \/ 8.5:1","offer_id":67601298751555,"sku":"BBT-SP-6C1F8C8261424710","price":1750.0,"currency_code":"AUD","in_stock":true},{"title":"+.5mm \/ 9:1","offer_id":67601298784323,"sku":"BBT-SP-39B2E57521376862","price":1750.0,"currency_code":"AUD","in_stock":true},{"title":"+1mm \/ 9:1","offer_id":67601298817091,"sku":"BBT-SP-87ECB3F647E61488","price":1750.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/spool-b4fddc87c6ce-au-4-0l-ross-pistons-2_87aaf4e4-0ee0-4a24-b093-be0bf8fb4cbb.png?v=1790918678","url":"https:\/\/builtbyboostandtune.com.au\/products\/au-4-0l-sohc-ross-racing-forged-pistons","provider":"BUILT BY BOOST AND TUNE","version":"1.0","type":"link"}