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Old 12-03-2002, 09:33 AM
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Could someone tell me the difference between forged flat top pistons and hyperutectic pistons?
On e-bay they have two or three machine shops selling remanufactured engines and this is one of the few things that seem to be different.
Thanks,Stubby

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Old 12-03-2002, 09:59 AM
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i believe the hyperutectic ones are actually cast aluminum with silicone mixed in with the metal to strengthen them, and the forged are just forged aluminum which is stronger than the hyperutectic ones.
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Old 12-03-2002, 10:00 AM
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My understanding is that the Hyper's are alloyed differently to increase the pistons resistance to melting, but I am not sure on that.

Forged pistons are forged rather than cast. When metal is forged it has superior granular structure and is therefore stronger.

Chris
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Old 12-03-2002, 12:11 PM
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Thanks for the info on the pistons,does anyone have any feedback on the shops selling the motors on e-bay?
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Old 12-03-2002, 12:19 PM
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a good set of hyperutectic pistons promote a faster and more efficient burn,more power!
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Old 12-03-2002, 12:41 PM
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[quote]Originally posted by Copper Top:
<strong>a good set of hyperutectic pistons promote a faster and more efficient burn,more power!</strong><hr></blockquote>

I would like to read the article you got that from.
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Old 12-03-2002, 06:58 PM
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a way to describe a hyper eutectic piston is like this , silicon promotes hardness in aluminum, all pistons have silicon in them. a regular piston has silicon added like when you add sugar to water, just enough to make it sweet, in a hyper piston they keep adding sugar(silicon)till it starts to fall out of suspension and gathers at the bottom of the glass, this liquid(aluminum) is then hypereutectic. much harder and tougher.
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Old 12-04-2002, 09:33 AM
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A good way to explain hyperutectic pistons is like this:
If you take chalk and run it across a chalk board this is like a regular cast piston on a cylinder wall. The piston is much softer and will wear out faster if the tolerences are too tight.
Now, if you run a piece of glass over a chalk board, it will leave nothing behind. This is like the hyperutectic piston on the cylider wall. The added hardness of the above average (hyper) silicon content (utectic) allows for slightly larger pistons and tighter tolerences, which promotes higher efficiency. Efficiency = Power
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Old 12-04-2002, 09:56 AM
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This may be wrong, but the way it was explained to me is they're almost as strong as forgies (because of the silicon content), but you can run tighter clearances because forgies expand more than the hypereautectics. I have a set in my s/b 406, but I ain't fired it yet.
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