In the race to achieve global CO2 targets, longer gear ratios helps to reduce fuel consumption in significant extent. The operating point of the internal combustion engine then shifts to lower speeds and specific torque is increased. Both measures lead to more pronounced rotational irregularity, however. The resulting higher design requirements for vibration isolation will nevertheless be reliably met by current technology as it is incorporated into today's engines and those targeted for the next evolution stage. The problem revolves around the next generation of engines, which will require even more capable systems. Although the technology offered by the dual-mass flywheel in conjunction with a centrifugal pendulum absorber is a prime candidate, the summation damper is also worth considering if a way can be found to extend its high potential at low operating speeds to mid-range and higher speeds. Schaeffler continues to investigate both concepts with a great deal of interest. The key to developing a more responsive summation damper lies in the ability to vary one relevant parameter with respect to engine speed. A solution that is robust, affordable, and can be deployed on a large scale has not yet crystallized, however.