But isn't heat dissipation part of the reason CF is more desirable? To me that means that it allows heat to escape and disperse easier helping it maintain a cooler temperature, not necessarily trapping it inside. Of course I'm far from any kind of expert tho.
Putting the carbon fiber subframe covers effectively reduces the amount of heat transferring from the subframe to your legs/environment (hence keeping your legs cooler). This removes one area for cooling of the heat from the rear cylinder, causing general temps to increase as result (heat generation ~constant, heat transfer down, therefore temp up). What
is saying is that by reducing the amount of heat energy escaping due to the covers, the now hotter air has to escape somewhere else. Places subsequently targeted: the plastics in proximity.
The air isn't necessarily trapped, it just has less flow movement/more time to increase in temperature, then gets directed away from your legs, towards other plastics and possibly melting them.
CF has a lower thermal conductivity (better insulator) when compared to metals and higher thermal conductivity (worse insulator) when compared to plastics. Generally, heat dissipation isn't a strong point, hence why CF is used often as heat shields.
Heat conduction in W/m-K
- Polycarbonate (~0.19–0.22)
- Carbon fiber (~5-7)
- Steel (~12-45)
- Aluminium (~200-250)