Quote:
Originally Posted by Badbubba
You are correct that the coated headers not give off as much heat. One reason is the "shiny" surface. It will not radiate as much heat, this is due to a low emissivity of the coating. But as for the temperature difference between the two header's surface temp, it depends on how you measured the temperature. If you used a contact device, such as a thermometer or thermocouple, no issues. If you used a point and shoot infrared temp gun without adjusting the emissivity for each surface, then the temp values could be skewed. Especially if the uncoated headers had a few hrs on them.
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I used a Pyrometer when I did my testing and both sets were with the car running at idle for five minutes. The ceramic set was coated inside and out also.