In fact, the 1930s V-12 car engine reverted to pushrod valve actuation to achieve even less engine noise.

Although a wedge-head design offers simplified valve actuation, it usually does so by placing the valves side by side within the chamber.

The engine then briefly operates with a fuel-rich mixture after each valve actuation.

This makes the valve actuation self-adjusting and there is no need to adjust the rockers.

Selecting intermediate positions provides a valve actuation with the effect of increasing cut-off.

Mondial had prepared a bike with desmodromic valve actuation (before Ducati) but did not produce it.

A helical camshaft is a type of mechanical variable valve actuation (VVA) system.

The engine was also unusual in having desmodromic valve actuation instead of springs.

Another Ducati trademark was desmodromic valve actuation, which was introduced on a 125-cc racer in 1956.

The engines were to be limited to 1600cc production based units with valve actuation by single overhead camshaft or pushrods.