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A valve job is the colloquial term for resurfacing the mating surfaces of the poppet valves and their respective valve seats that control the intake and exhaust of the air/fuel mixture in four stroke internal combustion engine, replacing valve oil seals, replacing any deficient valve springs, and otherwise bringing the components of a cylinder head up to manufacturer’s spec. [1] A ...
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.
Even though surforms leave very coarse finishes, the worked areas can be easily smoothed with finer tools, such as files and sanding blocks. Woodworker Sam Maloof described their use in chairmaking: "Once I have roughed out the arm on the bandsaw, I use a Surform® (Stanley® model No. 295).
The Alusil aluminium alloy is commonly used to make linerless aluminium alloy engine blocks. [7] There is no coating applied to the cylinder bore and blocks are not honed conventionally. During the manufacturing process, a chemical or mechanical process is used to remove aluminum from the surface of the cylinder bore, exposing a very hard ...
Sand blasting is also known as abrasive blasting, which is a generic term for the process of smoothing, shaping and cleaning a hard surface by forcing solid particles across that surface at high speeds; the effect is similar to that of using sandpaper, but provides a more even finish with no problems at corners or crannies.
Core plugs were initially designed merely as a necessary engine block component which was made necessary due to the "sand casting" method used to initially form an engine block. After the initial casting of the engine block, core plugs were designed to plug off the "sand exit ports" of the newly formed engine block.