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| need help on temperature reading!!! https://slantsix.org/forum/viewtopic.php?t=16910 |
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| Author: | grthigpen [ Tue Apr 04, 2006 7:11 pm ] |
| Post subject: | need help on temperature reading!!! |
does anyone have an infared temp gauge that can tell me the temp on the exhaust manifold after running normal for at least 10 minutes? need the reading from the manifold right above the flange thanks in advance GRT |
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| Author: | slantvaliant [ Tue Apr 04, 2006 7:15 pm ] |
| Post subject: | |
I don't have one of those - I have a thermal imager. Give me a little bit to dig out the thermographs. |
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| Author: | slantvaliant [ Tue Apr 04, 2006 7:36 pm ] |
| Post subject: | |
I'm not certain how long the engine had been running, but it was at least 10 minutes. In the area just above the outlet flange, I get an average of 274F (233F to 307F) The highest temperature on the manifold is 402F, in the longitudinal sections under the intake manifold. Disclaimers: 1. I did not test to find the exact emissivity of the manifold. I set the emissivity for typical rusted cast iron in this temperature range. 2. Reflected temperature was approximately 100F. 3. Remember, this is the external temperature, not internal. I don't know how to post a Word document or PDF file. If someone will tell me, I'll post some details. Someday, I plan to do a better study of manifold temperatures, both intake and exhaust. |
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| Author: | Jeb [ Tue Apr 04, 2006 7:54 pm ] |
| Post subject: | |
You can buy an infrared thermometer from Harbor Freight for about $30. |
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| Author: | slantvaliant [ Wed Apr 05, 2006 7:15 am ] |
| Post subject: | |
Be careful with the infrared "thermometers". Used correctly, they are very useful. The way I see them used by a lot of people, they're misleading. To do a comparison, always shoot at the same spot, from the same angle, with the same surroundings. The spot should generally be something with high emissivity - conventional non metallic paint, good electrical tape, very rusty iron, etc. I've even sprayed on foot powder to get a good surface. There should be nothing particularly hot around that would refect into the "thermometer". (If you bounced a ball off that spot, where would it go? Make sure there's not a furnace, a header, etc over that way.) It's better to shoot at less than a 45 degree angle to the surface, as well. Using one of these, you may get an idea of the temperature in an area, but you won't reliably find the hottest or coldest spots. |
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