Reply to "Hypereutetic v Forged"

bosswrenchMember

Hyper-eutectics are cast. For the detail-obsessed, 'eutectic' is the amount of proprietary additives -like silicon- the molten mix can dissolve. 'Hyper' simply means they added a bit more than that amount & mixed it in. There are also often steel struts inside to further control heat expansion. Their main advantage is less heat expansion= tighter clearances so less cold-start blow-by and better emissions numbers. Not as strong as forged so if you run high compression (10:! or more) or beat on the motor, you may have trouble making cast pistons live. "Fast street" means different things in different areas... They work fine if you understand their limitations. They do NOT like big loads of nitrous, for instance.

2/6/151:45 PM

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