Abstract
The article discusses causes of the appearance of transverse, longitudinal and torsionalcrankshaft vibrations in multi-cylinder internal combustion engines. Particular attentionis paid to the torsional vibration which is the most severe threat to engine crankshafts.Damping methods making use of torsion dampers are presented. With the reference toviscotic dampers, problems with their damping efficiency are discussed in the context ofviscosity changes of the damping liquid. The article also presents the amplitude-frequencycharacteristics of a series of viscotic dampers, which were recorded experimentally on theresearch rig and on a real object. An idea of vibration damper metric is given.