desmodromic

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desmodromic

(ˌdɛzməˈdrɒmɪk)
adj
(of mechanisms, almost exclusively of valves) that are controlled in both directions of their movement. A desmodromic valve is one which is actively both opened and closed by a mechanism rather than by a spring
References in periodicals archive ?
The vehicle is equipped with a Testastretta 11-degree V-twin engine with liquid-cooling and four-valves per cylinder with Desmodromic valve actuation displacing 937 cc, coupled with a six-speed gearbox and wet clutch, with chain final drive.
He is the moving spirit in India of the Desmo Owners Club (named after the desmodromic valve used in Ducati bikes) a global association of Ducati bike lovers, who travelled in July this year to Misano, Italy, to meet other Ducati aficionados and participate in the World Ducati Week, held at the Marco Simoncelli World Circuit racing track there.
This book is definitely for the technically inclined: while Walker's explanations of a few technological innovations, like Ducati's desmodromic valve system, turbocharging and the oil cooling of the GSX-R750, are clear and valuable, for the most part the reader is left to interpret the significance of the technical details ('a 492 cc, double-overhead-camshaft, across-the-frame four' boasting 'unit-construction design with horizontally split crankcases') the author chooses to mention.
Meanwhile, the awesome 90A V-twin Testastretta Evoluzione engine uses technology developed from the Desmosedici MotoGP bike, including the oval-throttle bodies and the fact that it's massively oversquare ( the superior Desmodromic valve operation allows this.
Incredibly, considering how fast automotive development moves on, the Desmodromic valve design has kept Ducati up there with the fastest superbikes, despite nearing its 50th year in production and despite its creator, Taglioni, dying in 2001.
Then along comes legendary engineer Fabio Taglioni to sprinkle his magic dust over the company with his feted desmodromic valve system .