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The difference between a cast and forged piston is the way it is made. A cast piston is made by pouring or injecting molten aluminum into a mold and letting it cool. A forged piston is made by ramming a die into a hot but not quite molten ingot of aluminum in a mold under great pressure (20+ tons!) The extreme pressure created in the forging causes the metal to be denser and have a uniform grain, making it much stronger and less brittle. There is more to making forged pistons than just the different manufacturing process, they often start with a stronger alloy such as 4032 or 2618 aluminum. Cast pistons are high in silicon content, which makes them dimensionally stable under high temperatures, but brittle. Forgings have a low silicone content and thus "grow" (expand) more when hot, but offer much improved strength and resiliency .

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15y ago

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