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Nikasil cylinders were always used for the 911 Turbo and RS models. Nikasil coated aluminium cylinders allowed Porsche to build air-cooled engines that had the highest specific output of any engine of their time. Nikasil was very popular in the 1990s. It was used by companies such as BMW, Ducati, Jaguar and Moto Guzzi in their new engine families.
The AJ-V8 was designed to use Nikasil-coated cylinders rather than the more-common iron cylinder liners. However, like the BMW M60, high-sulphur fuel reacted with the Nikasil coating and caused engine failures. Jaguar replaced affected engines, and has used conventional cast-iron linings ever since.
Cylinder liners (also known as sleeves) are thin metal cylinder-shaped parts which are inserted into the engine block to form the inner wall of the cylinder. [4] [5] Alternatively, an engine can be 'sleeveless', where the cylinder walls are formed by the engine block with a wear-resistant coating, such as Nikasil or plasma-sprayed bores.
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. Although similar, Alusil is not to be mistaken with Lokasil which was used by Porsche in the Boxster, Cayman, and 911 models from 1997 through 2008.
The M60 uses Nikasil- an alloy containing aluminium, nickel and silicon alloy- to line the cylinders bores. In fuels with high sulfur content (such as used fuels sold at the time in the United States, United Kingdom and South America), the sulfur damages the Nikasil bore lining, causing the engine to lose compression. [14]
From 1981, introduced in the R80G/S it used electronic ignition, Nikasil cylinders, and a lighter flywheel. [1] A number of different models were on the market: CS: the Classic Sport, with a 1,000 cc (61 cubic inches) engine. GS: Gelände/Straße - winner of a number of the Dakar rallies. RS: Renn (Racing) Sport; RT: Road Touring; S: with the R90S
Nigusil is a patented metal alloy created by Moto Guzzi for motorcycle cylinder liners. The name is an acronym for Nickel-Guzzi-Silicon. The name is an acronym for Nickel-Guzzi-Silicon. Moto Guzzi, having successfully created the first engine with a chromed cylinder lining, continued research to find a material that could replace chrome.
Secondly, while breaking in newly installed piston rings, a minute amount of wear must occur between rings and cylinder wall in order to seat the rings properly, and ensure a gas-tight seal. If the cylinder walls are too smooth, this wear will not occur, with the rings "skating" over the polished surface.