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Alusil is a hypereutectic alloy (AlSi17Cu4Mg or 390 alloy) in which silicon crystals are uniformly dispersed throughout the material. The cylinder wall is (factory) honed to expose and "round" the sharp silicon crystals. Iron plated (ferrocoat) pistons are required.
Nikasil is a thin plated layer over an aluminium cylinder. Electroplated nickel with a silicon cardbide dispersion. Aluminium (unplated) pistons are used.
There is no chrome (metalic chromium) in Nikasil. (Henry - mybe your thinking of Chromal - plated chrome subsequently mechanically "dimpled" ??)
John
Last edited by jcge; 03-04-2010 at 01:50 PM..
Reason: sp. Chromal ?.
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