Valve Train
Valve Train

Innovative solutions for the control of gas exchange belong to our core competencies for many years. Our services range from analysis and optimization of conventional valve trains with the aim to improve function and operational performance up to the development of fully variable valve control, which we early have recognized as a technology trend. Future petrol and diesel engines will be increasingly equipped with such variable valve systems. Take advantage from our long-time know-how and our integrated development approach in this area.


Innovative solutions for the control of gas exchange belong to our core competencies for many years. This includes in particular the fully variable mechanical valve train that allows continuous adjustment of valve lift and opening duration. As one of the key technologies the fully variable valve lift (VVH) helps to fulfill the requirements in future fuel economy and emission improvements.

In a gasoline engine, we achieve fuel economy benefits of 10-12 %. At the same time, we can represent this system with significantly improved torque characteristics at full load. Another advantage is the significant improvement of the mixture formation during CNG operation.

Cylinder De-Activation

In a gasoline engine, cylinder deactivation is a very effective measure to improve the efficiency at part load. For this purpose we develop valve train systems that allow the cycle-true valve deactivation at individual cylinders. Depending on the engine or vehicle size, with this technology we can achieve up to 12 % fuel savings compared to state-of-the-art engines - combined with the full variable valve lift (VVH) even up to 20 % savings.


Switchable roller follower (twin-lift system), as we have developed for various applications, will increasingly be found in series, both in gasoline and in diesel engines. These allow you to switch between two or three different valve lift functions. With this, we achieve for instance partly unthrottled operation at low engine loads with gasoline engines, or an improved air movement in diesel engines.