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.
///
/// mgb-v8@autox.team.net mailing list
/// Send admin requests to majordomo@autox.team.net
/// Send list postings to mgb-v8@autox.team.net
/// Edit your replies! If they include this trailer, they will NOT be sent.
///
|