CO.R.A. torsional vibration dampers have been studied and tested in order to respond to OEM standards
TVD (Torsional Vibration Damper)
This kind of pulley fits on crankshaft and drives the accessory transmission (FEAD).
TVDs have a rubber ring as an elastic element and are widely used on gasoline as well as on diesel engines for passengers cars, light and medium size trucks, engines for agriculture and other machinery.
Decoupled pulleys or DDS (Double Damper System).
This pulley type is made up of a TVD and a torsional coupling or isolator. These pulleys are mounted on crankshaft and drive the accessory transmission (FEAD).
DDS have two rubber inserts and are more complicated than TVDs in terms of design and construction.
Decouplers are widely utilized on passenger cars diesel engines and, in special cases, on some gasoline engines.