Stock Pistons?
Originally Posted by orangeapeel
ok, so what engines came stock with hyperutectic's? If any? I guess I have always been under the wrong assumption. 
Trending Topics
http://www.smokemup.com/tech/ls1.php
hmmm, shows cast aluminum there but if swoleguy is right i guess it's a moot point...
hmmm, shows cast aluminum there but if swoleguy is right i guess it's a moot point...
Teching In
Joined: Feb 2006
Posts: 9
Likes: 0
From: Springfield Il (home) Champaign-Urbana (school)
Hypereutectic is a term indicating the silicon (i believe) content of the aluminum. It is still a cast form of aluminum, but is a harder alloy than a pure cast aluminum.
As for which the LS motors have I can't say, however I too was under the assumption that they're hypers...I can't see non-hypers standing up to nitrous as well as the LS1's slugs do.
MT
As for which the LS motors have I can't say, however I too was under the assumption that they're hypers...I can't see non-hypers standing up to nitrous as well as the LS1's slugs do.
MT
Teching In
Joined: Feb 2006
Posts: 9
Likes: 0
From: Springfield Il (home) Champaign-Urbana (school)
Originally Posted by calongo_SS
Everything I've ever seen says they are hyper. pistons. And yes, all it indicates is the silicone content in the metal.
you mean SilicOn.....it's a matalloid
SiliconE is what they make fake ******* out of, it's a synthetic rubber
Teching In
Joined: Feb 2006
Posts: 9
Likes: 0
From: Springfield Il (home) Champaign-Urbana (school)
Originally Posted by kossuth
I've seen references to them being eutectic also.
Hypers don't cost hardly any more to make than non-hyper cast pistons, and have much better life, so most OEM's use them, especially in performance oriented engines like the LS series.
MT
Hypereutectic means that a material has the ability to go beyond its eutectic point.
This is the point where metal heats and cannot return to its natural state.
The silicon, not silicone, extends the range in which the aluminum can handle heat and return to its natural state. Therefore it can take more heat, aka more power.
As far as I know, all production cast pistons are made with a hypereutectic structure. Whether it is GM, Ford, Dodge, any OEM company.
This thread goes into the details.
This is why forged pistons can take more power, because there eutectic point is higher than cast.
This is the point where metal heats and cannot return to its natural state.
The silicon, not silicone, extends the range in which the aluminum can handle heat and return to its natural state. Therefore it can take more heat, aka more power.
As far as I know, all production cast pistons are made with a hypereutectic structure. Whether it is GM, Ford, Dodge, any OEM company.
This thread goes into the details.
This is why forged pistons can take more power, because there eutectic point is higher than cast.
