Desmodromic valve | Wikipedia audio article

This is an audio version of the Wikipedia Article:


00:00:49 1 Etymology
00:01:17 2 Idea
00:02:19 3 Design and history
00:04:57 4 Comparison with conventional valvetrains
00:08:08 5 Disadvantages
00:14:14 6 Controversy
00:15:51 7 Examples
00:17:50 8 See also
00:18:03 9 Sources
00:18:12 10 External links



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SUMMARY
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In general mechanical terms, the word desmodromic is used to refer to mechanisms that have different controls for their actuation in different directions.
A desmodromic valve is a reciprocating engine poppet valve that is positively closed by a cam and leverage system, rather than by a more conventional spring.
The valves in a typical four-stroke engine allow the air/fuel mixture into the cylinder at the beginning of the cycle and exhaust gases to be expelled at the end of the cycle. In a conventional four-stroke engine valves are opened by a cam and closed by return spring. An engine using desmodromic valves has two cams and two actuators, each for positive opening and closing without a return spring.