What should the engine temperature be? PDF Print E-mail
What should the engine temperature be?  The right engine temperature will vary widely, depending on the air temperature, fuel used, altitude, driving style, air flow conditions of the body and several other factors. There is absolutely no way anyone can tell you an ideal engine temperature. It is generally accepted that a proper range of temperatures is between 95 and 115 degrees Celsius (or about 205 and 240 degrees Fahrenheit). The biggest variable of all in measuring engine temperature is where and how the measurement is taken. Your infrared thermometer may be calibrated completely different than ours, or you may be pointing at a different spot on the head. We usually check the temperature pointing the infrared on the glow plug.
 

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