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911pcars 911pcars is offline
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Join Date: Jul 2000
Location: So. Calif.
Posts: 18,281
In '98, I was fortunate to work on the new model training program for the Mercedes ML320 SUV. From a meeting with the head powertrain engineer, he indicated the process they use to build their engine blocks (and cylinders) is the same as used by Porsche. As per the link cited by 1fastredsc, Porsche's "Locasil" tradename is the same process as used in MB's Silitec cylinders; both Kolbenschmidt processes.

From the new model training materials:

"Silicon Liner Technology" (Silitec) cylinder liners are manufactured separately, then joined as part of the engine during the engine casting process.

The cylinders are spaced on 106mm centers which allows engine capacities up to 5 liters
(ed. their modular engine concept).

The cylinders are an alloy of aluminum, silicon, copper and magnesium which provides an optimum material for use as a cylinder material. This material and manufacturing process offers several advantages over cast-iron liners. They include:

- Low weight (a savings of approx. 500 grams/cylinder)
- Better heat transfer
- Excellent dimensional stability
- Reduced friction
- Exceptional wear resistance
- Less noise and cylinder distortion
- Better HC emissions

During final engine machining, an acid solution exposes a thin layer of silicon crystals in the alloy. This provides an extremely hard yet low-friction wear surface. The manufacturing process that creates the cylinder liner is also more environmentally friendly."

FWIW, it sounds like the second generation of the "Alusil" cylinders.

This info might be good for something (???)

Old 02-08-2005, 09:46 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)