In general, within the marine
engine business, the selection of the flywheel torsional damper is the responsibility of the individual or company who assembles the package. Normally this means the engine manufacturer or packager.
It’s normal for the engine manufacturer to run a series of TVA/TVCs (torsional vibration analysis/torsional vibration calculations) when matching an engine/flywheel damper/ gearbox combination. This analysis is a study of the total mass elastic data of everything that rotates within the drive system. This includes accessories driven from the front of the crankshaft, the engine itself, the flywheel moment of inertia, the flywheel damper, the gearbox, the propshaft coupling, prop shaft, and propeller
. All of this data is fed into a computer program to assist with the analysis.
In the case of say, an 80’ commercial trawler
with 1000 h.p. engine, 6:1 reduction gearbox, 8” diameter prop shaft 20’ long and a 4 blade prop 70” in diameter, it can be critically important to get the analysis correct. If it isn’t correct, torsional spikes in the drive train can break crankshafts, or shear an 8” propshaft, or wreck a transmission
In the case of a small sailboat engine, the stakes aren’t quite so high, but it’s still important for safety
, reasonable component life and low noise
levels. The fact that you noted a high degree of wear on the Centa damper components tells me that the engine is probably what I would call torsionally “active”, and the damper is absorbing a good bit of energy. As mentioned earlier, all of this can be a combination of the mass of all the components in your system, and it can also be something as simple as an idle speed set too low, or lack of ventilation in the flywheel housing, and the damper is getting too hot.
I would start by going back to Venus and discussing it with them. I can guarantee you they have seen the problem before. I would also contact Centa and ask for their advice/help. When you talk to them have all of your system data at hand....such as engine and gear box model, damper model, approximate shaft coupling size, drive saver info,shaft diameter and length, prop diameter, number of blades, manufacturer and model, etc. Centa has lots of experience with this and they have the technical ability to do a torsional analysis. The best option, of course, is to get Vetus to do this leg work
for you, as they are ultimately responsible for the compatibility of the package.