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Tempature Guns

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Old Jan 3, 2004 | 02:16 PM
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2002WS6_MN6's Avatar
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Default Tempature Guns

I'm looking to buy an infrared tempature gun.
I want one with enough range to measure the tempature of the exhaust tube on headers but I'm really not sure how hot an exhaust tube header pipe gets..

The higher the range the more expensive the guns get so does anybody know how hot an exhaust header tube gets?
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Old Jan 3, 2004 | 03:01 PM
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1000C should be overkill, your EGT will be below that
and header wall temp lower still.
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Old Jan 3, 2004 | 05:37 PM
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At idle, with ceramic coated FLPS, my headers are 450-550*. Certainly makes it easy to diagnose which cylinder is missing

I bought mine from Northern Tool for $70 a year or so ago.
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Old Jan 6, 2004 | 11:50 PM
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does it work on a moving part? Like you torched a spot on the wheel and spin it up, then used the temp gun on it, will it work?
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Old Jan 8, 2004 | 12:10 AM
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I just ordered this one:

Raytek ST25
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Old Jan 8, 2004 | 07:45 AM
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They are great for detecting misfires, but can be isleading with ceramic coating (inconsistent readings).
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Old Jan 8, 2004 | 09:38 AM
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Yea, I know.. they don't work well on shiny metallic like surfaces. Something about the emissivity of the material being measured..

From the ST2 Autopro Manual:
Emissivity
Emissivity is a term used to describe the energy emitting
characteristics of materials. Most organic
materials and painted or oxidized surfaces have
an emissivity of 0.95 (pre-set in the unit).
Inaccurate readings can result from measuring
shiny or polished metal surfaces. To
compensate, cover the surface to be measured
with masking tape or flat black paint. Allow time
for the tape or paint to reach the same
temperature as the material underneath it.
Measure the temperature of the tape or painted
surface.
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Old Jan 8, 2004 | 11:57 AM
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Originally Posted by 2002WS6_MN6
Yea, I know.. they don't work well on shiny metallic like surfaces. Something about the emissivity of the material being measured..

From the ST2 Autopro Manual:
Arrg, I was thinking about buying two cheap ones and open them up, put the sensor in the front suspension secured well, and wire it from there to the center console like the garage door opener/cell phone holder spot and I can read the brake temp while the car is moving, like it rises when hard on the brake and see how fast it cools off while it's moving...there goes one of my creative idea cuz it won't work well on shiny or polished surfaces....
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Old Jan 8, 2004 | 12:50 PM
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Look at page 10 of this pdf..
I know I've used tempature guns on brake rotors in the past and my readings were consistant..

http://www.raytek-northamerica.com/a...manual_eng.pdf
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