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MAHLE GmbH is a German automotive parts manufacturer based in Stuttgart, Germany.It is one of the largest automotive suppliers worldwide. [2] As a manufacturer of components and systems for the combustion engine and its periphery, the company is one of the three largest systems suppliers worldwide for engine systems, filtration, electrics, mechatronics, and thermal management. [3]
Nikasil was introduced by Mahle in 1967 and was initially developed to allow Wankel engine apex seals to work directly against the aluminum block. [1] This coating allowed aluminum cylinders and pistons to work directly against each other with low wear and friction.
The engine was modified by the addition of an Alpina specific ECU, oil cooler and lighter and stronger MAHLE pistons. [5] These modifications allowed the engine to generate 360 PS (265 kW; 355 hp) between 5,500 rpm to 6,000 rpm and 500 N⋅m (369 lb⋅ft) of torque at 3,800 rpm to 5,000 rpm. The engine has a red-line of 7,000 rpm.
The pistons used in an Alusil engine block typically have an iron-clad plating or similar coating on the piston skirts to prevent galling of the aluminum pistons when run against the uncoated aluminum cylinder bore. Examples of this coating include Mahle Ferrostan (I & II), FerroTec, or Ferroprint. [9]
The B12 6.0 used a modified version of the BMW M73 V12 engine. The modifications include enlarged engine capacity to 6.0-litres, higher compression Mahle aluminium pistons, modified camshafts, and air intakes, Bosch Motronic M5 2.1 fuel injection, and a new exhaust system with a catalytic converter having an electronically heated metal catalyst.
The B5 is based on the 545i and uses a modified version of its 4.4-litre valvetronic V8 engine designated by Alpina as the H1 (shared with the B7 and B6). [1] Changes to the engine include an Alpina specific block made by Steyr, a forged crankshaft and low compression Mahle pistons. [2]