I just THOUGHT I knew how to burn my TL300

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A boundary layer often forms near the pipe wall that can be many hundreds of degrees cooler than the main exhaust flow temp. I did some testing on my insert with flex pipe several years ago using my VOM w/K type thermocouple attached. It confirmed that temps near the the wall are much cooler than toward the center of the pipe. I even inserted the thermocouple at an angle to prevent air being drawn into the probe hole from influencing the results.

Here's a paper about laminar and turbulent flow in pipes, which might answer additional questions or simply put one to sleep:
http://www.uio.no/studier/emner/mat...rvisningsmateriale/modul-5/Pipeflow_intro.pdf
 
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