Engineworld

                                 DESMODROMIC MECHANISM Hey guys it been a very long time since I  have posted ,in this post I would be discussing about the desmodromic mechanism. A  desmodromic  valve  is a reciprocating engine 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, ea ch for positive opening and closing without a return spring.                                                              These types of valves are used because the normal puppet valves fail at higher RPM thus making it difficult for the engine to operate at higher speeds as result these types of mechanism