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Block is aluminum, liners = aluminum/nickel (more) (archive)

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Posted by Dana on October 25, 2000 at 13:04:59:

In Reply to: Why Alusil? Why not steel liner? M60 posted by D L on October 25, 2000 at 00:50:28:

See for background details on the alusil blocks.

Quoting from a 1994 press release that you can access from the site:

"In its basic construction, the 530i engine is essentially identical to the 4.0-liter V-8 introduced last year in the new BMW 740i and 740iL; the primary differences are a somewhat smaller bore and a considerably shorter stroke. Its weight-saving aluminum cylinder block is cast with closed-deck construction (webbing connecting the tops of the cylinders) for a very rigid overall structure that helps prevent distortion during operation, minimizing wear. A new technology further contributes to the V-8's light weight of only approximately 470 pounds including electricals and cooling. Instead of the steel cylinder liners used by many
carmakers in aluminum blocks, long-wearing cylinder walls are created by depositing a "dispersion layer" of nickel on the aluminum via galvanic action. Called Galnikal (known these days as "Nikasil"), this process was used for some years in BMW motorcycle engines before being introduced in the V-8 engine, so it's not an
untried technology -- just an advanced one."

'95 530ia

One question if some of you know the answer. Why does BMW use Alusil after they discover the Nikasil problem.
Why don't they just use steel liner as most other manufacturers use.

What is the advantage of Alusil over steel liner?
And, is Alusil just a coating or is the whole block made of alusil?


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