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Leaking coolant - Out of warranty - all lines need replaced

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Leaking coolant - Out of warranty - all lines need replaced

 
  #41  
Old 03-14-2019, 02:30 PM
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Originally Posted by DJS View Post
Lance, you have to be careful with IR thermometers - some surfaces like shiny aluminum
Less concerned with the absolute temps than the differential. The temperature differential I took was actually taken at the exterior hood surface (with/without engine cover underneath). This was all done prepolish.

 

Last edited by Unhingd; 03-14-2019 at 04:22 PM.
  #42  
Old 03-14-2019, 02:57 PM
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With a reflective surface, I don't think you'd get a reasonable differential, since a big component of what the thermometer would see is IR reflected from something else.

Actually, polishing Al makes very little difference as it turns out. An IR thermal camera at work came with a list of emissivities:
Aluminum, polished: 0.05
Aluminum, rough surface: 0.07
Aluminum, strongly oxidized: 0.25

I tried one of these IR thermometers to set up my baseboard heating system at home: shiny copper has an emissivity of 0.01, so I couldn't get anything meaningful off the pipes. But when I stuck on some black plastic electrical tape (E=0.95), then I could get a reading.

Sorry for the long-winded aside...
 
  #43  
Old 03-14-2019, 06:53 PM
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Ultimately I guess the charge cooler removes most of the heat through conduction into the coolant but there will be some emission through radiation, especially given it's large surface area. Polishing it to a highly reflective finish would reduce the infra red emissions (heat loss through radiation) significantly I would think. Good for protecting the hood but not so much for cooling efficiency.
 
  #44  
Old 03-14-2019, 08:57 PM
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Originally Posted by TXFireblade View Post
Ultimately I guess the charge cooler removes most of the heat through conduction into the coolant but there will be some emission through radiation, especially given it's large surface area. Polishing it to a highly reflective finish would reduce the infra red emissions (heat loss through radiation) significantly I would think. Good for protecting the hood but not so much for cooling efficiency.
radiant heat xfer will be minor compared to convective heat xfer. The only place that radiant heat can go is the engine cover (or the paint job if the cover is removed). Much better to eliminate any restriction to the airflow across that charge cooler.
 
 
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