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Re: piston question

To: James Bown <bown@concentric.net>
Subject: Re: piston question
From: James Jewell <m1garandusa@netscape.net>
Date: Tue, 07 May 2002 08:31:00 -0400
Cc: MGB Newsgroup <mgb-v8@autox.team.net>, buick-rover-v8@autox.team.net
References: <3CD6915E.8070402@netscape.net> <001b01c1f584$faae4e20$0501a8c0@sms.siemens.com>
Reply-to: James Jewell <m1garandusa@netscape.net>
Sender: owner-mgb-v8@autox.team.net
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:0.9.4.1) Gecko/20020314 Netscape6/6.2.2
Hypereutectic is materials-science or metalurgy word that refers to the 
molecular structure of a metal.  In this case, hypereutectic describes 
how the aluminum was cast (largely a product of the thermal experiences 
the piston saw), and the properties it now possesses.  Hypereutectic 
pistons are stronger than regualr cast pistons (almost as strong as 
forged pistons), and have a very low coefficient of thermal expansion, 
ie it doesn't get very much bigger when it heats up.  This means that 
you can design it for a much smaller piston-to-bore clearance and get 
equal performance across a large temperature range.  They also tend to 
make the engine quieter because of less piston slap.  Forged pistons are 
the exact opposite, and have awful performance when cold.  However, they 
are "bulletproof" once warmed up.  Not useable with a street car.
JJJ


bown@concentric.net wrote:

>I have a piston question:
>What does "hyperutectic" mean?
>Regards,
>Jim B.

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