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The crosshead design reduces sideways forces on the piston, keeping diametral cylinder liner wear down to about 30 μm per 1,000 hours. [1] As a piston descends, it compresses incoming combustion air for the adjacent cylinders. This also serves to cushion the piston as it approaches bottom dead centre, thereby removing some load from the bearings.
Wisconsin's fame came from its small air-cooled engines, such as AEH (used on generators, garden tractors, skidsteers tractors), AEN, and VF4. [1] In the 1950s they were able to claim they were the world's largest manufacturer of heavy-duty air-cooled engines.
These pistons can survive mild detonation with less damage than stock pistons. 4032 and hypereutectic alloys have a low coefficient of thermal expansion. This allows tighter piston to cylinder bore fit at assembly temperature. The "2618" performance piston alloy has less than 2% silicon and could be described as hypo (under) eutectic.
The engines came stock with triple tuned pipes, 38mm VM Roundslide Mikuni Carburetors and forged pistons. This shared similarities with smaller displacement contemporaries, the Arctic Cat ZRT 800, Polaris XCR 800, and the Skidoo Mach Z 800. The sled also featured a Wilwood hydraulic Disc brake.
Free-piston engine used as a gas generator to drive a turbine. A free-piston engine is a linear, 'crankless' internal combustion engine, in which the piston motion is not controlled by a crankshaft but determined by the interaction of forces from the combustion chamber gases, a rebound device (e.g., a piston in a closed cylinder) and a load device (e.g. a gas compressor or a linear alternator).