Ugh. I consulted the materials you linked. Thanks. Clearly painting my shield was a mistake as far as the emissivity of the shield goes. But IAT temps are down from when the heat shield was off. So I have to think that an aluminum heat shield painted flat black on the side opposite from heat source (exhaust manifold) is significantly better than none at all. But do you know a good layman's way to estimate the difference between my heatshield painted versus unpainted? If it is significant, I can consider removing the paint, obviously.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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