![]() This level, which is called the eutectic point, is around 12 percent. While cast piston-alloys use silicon, which increases the wear resistance, durability, and thermal characteristics of the aluminum, there is a limit to how much silicon can be utilized so it is evenly distributed without large nodes of silicon forming. The word hypereutectic gets its name from the aluminum alloy used during the manufacturing process. What this means is that an over-stressed cast piston can fail more quickly.Īn option that many consider slightly better for performance applications than cast pistons are hypereutectics. Ductility is a solid material's ability to deform under tensile stress. ![]() The major drawback to running cast pistons is that the cast aluminum is limited in its ductility. This enables long ring-land and skirt life, as well as the ability to retain tighter side wall-clearances for quiet operation. Cast pistons also offer excellent wear and thermal characteristics. This near net shape minimizes the overall finish-machining that is required, reducing its cost. Cast tooling is generally designed to produce a near net casting. Casting a piston has a few advantages over forging when manufacturing. During the casting process, the melted aluminum alloy is poured into a mold that when cooled after filling, results in a piston-like "blank" being made. A cast piston is built just like it's named. We've all heard these nomenclatures applied to pistons, but what does it mean-what's the difference? The difference is found in the way that the piston is actually made. Check clearance.Ĭompression Ratio: 58-11.6, 64-10.7, 76-9.The two most popular ways that a piston is manufactured, either results in a cast or forged piston. ![]() Deep valve reliefs for "Flat Milled" heads with 23 degree valve angles. Product Details & Specifications ICON Forged Piston- Chevy 350, Rod 5.700, Flat Top +2.1cc 2VĬentered pin.
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