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Message: <blockquote data-quote="t2ribena" data-source="post: 306299" data-attributes="member: 3847">Nikasil is normally electrodeposited onto another material...with this coating BMW can use aluminium engine cylinders with the aluminium cylinders sleeve which is normally not possible and a cast iron cylinders is used instead...i think BMW stop using Nikasil coatings on M52TU itself and replaces it with more robust Alusil for the cylinders sleeve where with this material it allows the cylinders to be without the typical liners which makes the close tolerance engine possible...unlike Nikasil which is coating technology, Alusil is a type of Aluminium alloy which has the silicon as the alloy material.for the N52 magnesium crankcase, the Alusil cylinders sleeve with the cooling duct for water coolant is cast into the magnesium crankcase...this saves the weight when compare to making the whole crankcase Alusil instead.</blockquote>