3. Given that cooling is important, thinner plates will dissipate heat better than thick ones (notice the difference in plate thickness between the two setups-stock left, Barnett right). Aside from a material that's almost impervious to this because it can inhale and exhale oil quickly, the best ally in heat control is smooth steel plates. The smoother the surface the more surface to squeegee fluid and pass the heat on and out. In fact the quickest way to destroy a modern wet clutch is to sand or bead blast the steel plates! The second quickest is using springs that will affect this efficient transfer of heat, by making the strength of your hand the factor that alters the plates ability to breathe oil.