Quote:
Originally Posted by cmitchell17
What benefit are you looking for in the 4032 grade? I thought most "regular" type automotive pistons were high silicone?
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That’s true, most automotive pistons are high silicon, the OEM hyper eutectics for example. There are two main alloys used in forged pistons. 2618 and 4032.
2618 is low silicon. This makes the material more resistant to fractures, but also is softer and requires more bore clearance due to its higher coefficient of expansion. The softness is somewhat alleviated with skirt coatings and ring land anodizing, but they still rattle at cold start and won’t last.
4032 is high silicon, and is more brittle than 2618, but wears better and expands less.
2618 is typically used in power adder applications and 4032 in na. The trade offs for the “toughness” of 2618 are not worth it for what I want to do. A hyper eutectic cast piston like the OEM would work for me.