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when the exhaust gas cools, it gets more dense, ,and consumes less space. this means it'll slow down, and th e vacuum nyou mentioned is created by the speed at which the exhaust gasses travel.

The gasses travel from very high pressure at the beginning of the header to a low pressure at the end, and if the header is perfect to a vacuum. Can't beat the forced flow behind this.
 

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Interesting thread.

On black particulates on a shiny surface, perhaps the black will increase radiant heat out but the underlying shiny layer will still be reflecting heat the other way.
 

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Discussion Starter #43
Interesting thread.

On black particulates on a shiny surface, perhaps the black will increase radiant heat out but the underlying shiny layer will still be reflecting heat the other way.
Based only upon thought experiments, that is also what I am thinking. I think the "black stuff" will warm up to operating temp, then be neutral.

Maybe.
 
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