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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.
Dry liner cylinder blocks use either the block's material or a discrete liner inserted into the block to form the backbone of the cylinder wall. Additional sleeves are inserted within, which remain "dry" outside, surrounded by the block's material. For either wet or dry liner designs, the liners (or sleeves) can be replaced, potentially ...
An unusual form of four-stroke model engine that uses what is essentially a sleeve-valve format, is the British RCV series of "SP" model engines, which use a rotating cylinder liner driven through a bevel gear at the cylinder liner's "bottom", which is actually at the aft end of the cylinder; and, even more unusually, have the propeller shaft ...
The liners were only loosely installed into the block with hand pressure. The sealing of the liners into the engine block was at the bottom by a pair of soft metal "spectacle washers" [4] that each sealed a pair of liners. Each liner stood slightly proud of the cylinder block face. [5] so that it formed a good seal against the head gasket when ...
For the cylinder bores of hypoeutectic aluminum-silicon alloy blocks, PTWA's main advantages over cast iron liners are reduced weight and cost. The thinner bore surface also allows for more compact bore spacing , and can potentially provide better heat transfer .
Production at Crewe was originally planned to use unskilled labour and sub-contractors with which Hives felt there would be no particular difficulty, but the number of required sub-contracted parts such as crankshafts, camshafts and cylinder liners eventually fell short and the factory was expanded to manufacture these parts "in house".
The engine features a die-cast cylinder block made of an aluminum alloy with 17% silicon. During the machining process, the cylinders were etched leaving the pure silicon particles exposed providing the piston wear surface and eliminating the need for iron cylinder liners. The block has cast iron main caps and a cast iron crankshaft.
The RE is a wet sleeve design, with four cast iron cylinder liners attached to an upper cylinder block deck plate. With a bore of 3.5 in (89 mm) and a stroke of 3.1 in (79 mm), the engine displaced 1,955 cc (119.30 cu in). [13]
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