180* for engine coolant (and automatic transmissions) and 215* for engine oil is considered to be near perfect.
IR isnt going to tell you the temperature... just the surface temperature of the medium that you are looking at (not saturation temperation). You need an immertion probe type transducer to give you an accurate reading.
Last edited by chicane; 12-06-2008 at 09:25 PM.
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