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Alusil as a hypereutectic aluminium-silicon alloy (EN AC-AlSi17Cu4Mg / EN AC-48100 or A390) contains approximately 78% aluminium and 17% silicon.[1][2] This alloy was created in 1927 by Schweizer & Fehrenbach[3] of Baden-Baden Germany and further developed by Kolbenschmidt.[2]

The Alusil aluminium alloy is commonly used to make linerless aluminium alloy engine blocks.[4] Alusil, when etched, will expose a very hard silicon precipitate. The silicon surface is porous enough to hold oil, and is an excellent bearing surface. BMW switched from Nikasil-coated cylinder walls to Alusil in 1996 to eliminate the corrosion problems caused through the use of petrol/gasoline containing sulfur.

Engines using Alusil include:

See also[edit]


  1. ^ a b c "ALUSIL - Cylinder Blocks for the new Audi V6 and V8 SI engines" (PDF). KS Aluminium-Technologie AG. Retrieved 13 January 2010. 
  2. ^ a b "What is Alusil coating?". finishing dot com. Retrieved 13 January 2010. 
  3. ^ a b c "Rheinmetall's tradition of automotive excellence". Rheinmetall Defence. January 2006. Retrieved 13 January 2010. 
  4. ^ "High-performance engine blocks for tomorrow’s challenges". Kolbenschmidt Pierburg AG. 12 September 2005. Retrieved 13 January 2010. 
  5. ^ a b "KS Aluminium-Technologie: engine blocks for the new Audi A6". Rheinmetall AG. August 2004. Retrieved 13 January 2010. 
  6. ^ "High-tech products for the new and advanced BMW V12". Kolbenschmidt Pierburg AG. 10 January 2003. Retrieved 13 January 2010. 

External links[edit]