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Facts:
Alusil Has Excellent Lubricating qualities
Alusil is lightweight and wears well
All cylinders can be re-honed and re-bored for oem and oversizing.
Honing keeps bores true and seals rings and sometines can be reworked with common tools.
Alusil, Lokasil, Silitec, DiASil, Mercosil, ALBOND—are all trade names or trademarks for what is generically known as hypereutectic aluminum, which is a new/old material for cylinder bore wear surfaces. Hypereutectic aluminum is both new and old. Its cousins, hypoeutectic and eutectic aluminum, have been used for pistons and connecting rods for a number of years. One of the earliest applications of hypereutectic aluminum was as the wear surface in an unlined cylinder in some Porsche engines in the 1960s. The 1971 Chevrolet Vega was the first true production automotive engine with a linerless hypereutectic aluminum cylinder bore as the wear surface. Despite the car’s reputation, the cylinder concept was ahead of its time.
When properly finished, hypereutectic aluminum cylinder bores present a surface to the piston rings that is roughly equivalent to glass. The resulting engine has lower friction, excellent sealing, improved dimensional stability, improved heat dissipation, reduced weight, better recyclability, lower manufacturing cost and higher durability compared to the traditional aluminum block with cast iron cylinder liners.
Hypereutectic aluminum is saturated with silicon particles that must be exposed during honing. A two-stage process first hones a cylinder’s wall to a mirror-like finish and then relieves aluminum around the silicon particles.
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https://cdn2.ms-motorservice.com/fileadmin/media/MAM/PDF_Assets/Reconditioning-of-Aluminium-Engine-Blocks_51912.pdf
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Fastattackmotorsports.com read below...
Alusil Engine Services
When using new piston rings in an Alusil engine block, it is essential for good ring sealing that the cylinder walls are properly prepared. This requires a fairly involved process in working the Alusil to the surface finish specifications published by the patent holder of the Alusil alloy.
There are many misconceptions about Alusil, one of the most common being that it is a "spray on" or applied coating to the cylinder walls. This is in part due to the confusion with other process such as Nikasil or Lokasil which are in actuality entirely different. Alusil is an alloy of aluminum containing silicon patented by Kolbenschmidt Aluminium-Technologie GmbH. This means that the entire casting in which the cylinders reside is a heterogenous alloy and the entire casting contains the silicon crystals. For this reason, it is very feasable to recondition cylinder walls as the silicon content is present deeper in the walls as well. However, machining and reconditioning the cylinders in an Alusil block requires a significant investment in time and technique to preserve the integrity of those silicon crystals.
Fast Attack Motorsports is one of the very few shops in the US with the equipment, experience, and technique to perform this process properly and to specification.
While not all bores can be prepared by honing and exposing alone, many can. For those that can not be due to existing cylinder wall condition (i.e. gouges, scrapes,etc), some light boring is done keeping in mind the end goal for diameters and available pistons.
Their experience is rooted in the BMW S85 and S65 engines, the process is applicable to all engines with Alusil blocks such as those manufactured by Mercedes, BMW, Audi, and Porsche.
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Alusil Engine Services - Fast Attack Motorsport
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