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Hyper or Hypereutectic pistons


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Hypereutectic cast pistons are more brittle, but they allow a tighter "cold" fit in the bore than regular forged pistons. They're harder (thus the "more brittle" bit), so they'll resist scuffing and other wear better; on the downside, that means that you're more likely to see block damage.

 

I'd guess that your best bet for hypereutectic pistons would be to call up a manufacturer that makes custom slugs. Especially one that makes regular L28 pistons.

 

Looking at the power and boost levels people have achieved here though, even with stock internals, I don't really see a need for them.

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mickey235au,

 

PM sent.

FYI, the HE pistons were purchased from ITM Engine Conponents.

http://www.itmengine.com

Why? to me the answer is based on what you want as a DD, how much money you want to spend, and general objectives for your ride. My objective was to have a DD with a target of 300hp. This is covered in my MsPs.

Here is the literature that I gather to justify this purchase for me (taken from my MsPs).

Since some of the engine-rebuild decisions were not mine, I have researched one of the most critical parts of a rebuild, the selection of the pistons. Hyper-eutectic pistons were placed in this L28ET. Subsequently, the primary focus of this search was technology, composition and durability of these pistons. After reading the articles below, I am comfortable with this decision to run with hyper-eutectic pistons because irregular tuning/maintenance and heavy loads (heat) are two of the many critical reasons for piston failure (detonation). However, only time will tell.

 

Piston Upgrade: Cast, Hyper-eutectic or Forge pistons.

http://en.wikipedia.org/wiki/Hypereutectic_piston

http://www.stealth316.com/2-pistonguide.htm

http://www.thirdgen.org/techboard/power-adder/214262-hypereutectic-pistons-not-so.html

Larry Carley, Technical Editor. Engine Builder Magazine. Pistons and Pins: What’s New. (Google) See: ??

Larry Carley, Technical Editor. Engine Builder Magazine. Piston Design, An Evolutionary Tale. (Google) See: http://www.babcox.com/editorial/ar/eb40354.htm

Larry Carley, Technical Editor. Engine Builder Magazine. Performance Pistons. See: http://www.aa1car.com/library/2005/eb60522.htm

Beck Racing. Hypereutectic -vs- Forged Pistons. See: http://webpages.charter.net/beckracing/page11.htm

BLKMGK in HybridZ. Heads and bores. See: http://forums.hybridz.org/showthread.php?t=65902

QUIKDECISION in Offshoreonly.com. Piston Choice- hypereutectic vs. forged. See: http://www.offshoreonly.com/forums/archive/index.php/t-102390.html

Piston Tech by TEAM-INTEGRA.NET. See: http://www.team-integra.net/sections/articles/showArticle.asp?ArticleID=183

TRS in TheRangerStation.com. cast vs hypereutectic pistons. See: http://www.therangerstation.com/forums/showthread.php?p=72404

 

Enjoy the read...

john

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