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Wet liner cylinder blocks use cylinder walls that are entirely removable and fit into the block using special gaskets. They are called "wet liners" because their outer sides come in direct contact with the engine's coolant. In other words, the liner is the entire cylinder wall, rather than merely a sleeve.
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.
A sleeve valve takes the form of one (or in the case of double sleeve valves, two) machined cylinders which fit concentrically between the piston and the cylinder block bore of an internal combustion engine having cross-flow induction/exhaust. These sleeves have inlet and exhaust ports machined in the periphery, analogous to a two-stroke motor ...
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 .
Siamesed cylinders are engine cylinders arranged in such a way that they have no channels between them to allow water or other coolant to circulate. [ 1 ] [ 2 ] Cylinders are generally arranged in this manner when the engine block is of limited size or when stability of the cylinder bores is of concern, such as in racing engines. [ 3 ]
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.
The original series Colombo V12 featured a 90 mm bore spacing (compare with Lampredi 108 mm), the offset between cylinder banks was 20mm (compare with Lampredi 22 mm) and the engines had shrunk-in wet cylinder liners and detachable heads (Lampredi design used screwed-in wet cylinder barrels and cylinder block/head were a single unit bolted to ...