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Spring valve installation

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Mechanical knowledge

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65,742 次观看 • 9 个月前 •via X (Twitter)

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A valve spring inside a running engine does more than compress and release. The spring also rotates slowly along its axis with each cycle, and that rotation is intentional. The valve face strikes the same metal seat thousands of times a minute, and without rotation any single contact point would wear down unevenly. By spreading that contact around the full circumference, the rotation evens out heat and mechanical wear so the valve seals cleanly for much longer. White marks painted on the coils make the rotation visible on camera. Without them, the movement would be impossible to see.
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