Re: chainsaw cylinder temperature?

"Charlie+"  wrote in message news:89k19jlledmumfehiklp9jbvmhjumukecm@4ax.com...
On Thu, 11 Jul 2024 21:45:08 -0400, "Jim Wilkins" <muratlanne@gmail.com>
wrote as underneath : ...
Have you a fin painted (HT) matt black to measure on? Otherwise your
reading with IR maybe low if looking straight at Al?  Running rich will
help cool it down a little .. Sorry no experience here on actual running
temps!  C+
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I also have thermocouples and a thermal imager. Generally on a heatsink the imager shows a temperature spread greater than the error from not adjusting for emissivity, I've left it at the default 0.98 on the IR thermometer and drill a small hole for a K thermocouple at the indicated hottest spot in the rare case that I need more accuracy. Typically the place damage will occur is hidden internally anyway, so comparing IR readings to known values for similar conditions has to be enough. On power semiconductors a base-emitter or other diode voltage drop at or corrected to minimal current is a good indication of actual internal device temperature.