Quote:
Originally Posted by Wonderbar
I don't imagine heat sinks not attached to the coils would do anything, since they are designed to pull heat away from what they are attached to. Aluminum with heat shielding probably is the easiest route.
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I had considered that, and put them on the inside surface of the heat shield because the heat is coming from an external source (radiating from the exhaust). Hopefully, most of the heat would be reflected by the heat shield, but once heat soak started to set in, the heat sink on the inside would absorb that as well and spread it over a larger surface area, allowing moving air from the leading edge to dissipate it more effectively. Honestly, it could be floating on standoffs a few mm inside the shield, allowing the resulting air gap between the shield and the sink to help insulate as well.
So the heat sink is not the primary means of reflection/dissipation. The outer, reflective surface of the heat shield is. The heat sink is there as a secondary or tertiary means to absorb and dissipate the heat once it starts soaking through and before it reaches the coils. Considering ATL BRZ's track usage and the fact that he's in Atlanta, I expect that the shield would start to heat soak after a while.
Or it might be entirely unnecessary. But that's why I put it where I did.
Edit: thought of an easier way to word it. The heat sink would be acting to pull and dissipate heat from the shield once the shield got heat soaked. So for the sink, the shield itself is the heat source. I would probably air gap it on small standoffs, to only absorb heat radiating off the inner surface or the shield.