Alusil as a hypereutectic aluminium-silicon alloy (AlSi17Cu4Mg) contains approximately 70% aluminium and 30% 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[]

  • Hypereutectic Pistons

External links[]

  1. 1.0 1.1 1.2 "ALUSIL - Cylinder Blocks for the new Audi V6 and V8 SI engines" (PDF). KS Aluminium-Technologie AG. Retrieved 13 January 2010. 
  2. 2.0 2.1 "What is Alusil coating?". finishing dot com. Retrieved 13 January 2010. 
  3. 3.0 3.1 3.2 "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. 5.0 5.1 "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.