4 ms·
In the motorcycle world Ducati has been shipping desmodromic[0] valve trains for years. Not camless, but springless. [0] https://en.wikipedia.org/wiki/Desmodro
by bch 11y ago
In the motorcycle world Ducati has been shipping desmodromic[0] valve trains for years. Not camless, but springless.
[0] https://en.wikipedia.org/wiki/Desmodromic_valve https://en.wikipedia.org/wiki/Desmodromic_valve
- Grishnakh 11y agoYeah, and they're the only ones using it. As your link notes, there are significant disadvantages to that system (as well as advantages), namely complexity, greater moving valvetrain mass (you need two cam lobes per valve), and inability to use hydraulic valve lash adjusters (which means you have to periodically adjust them; not a problem on a racing or high-performance motorcycle, but definitely a problem for a passenger car where these days you want to be able to go 100k miles without any service other than oil changes and tire rotations).