Quote:
Originally Posted by Doktor Bert
I submit for you two photos taken of the temperature gauge in my 300SD (both verified by mechanical SW gauge) with the 80°C and 60°C thermostats. These readings were consistent over 4,000 miles with the 80°C thermostat and 50,000+ miles with the 60°C thermostat.
Something I learned in years of circle track racing....
If the cooling system is adequate for the engine's horsepower (read: heat) output, the engine will run very cool if the circulation is not restricted by a thermostat and the opening value of the thermostat will then become the influencing factor in the maximum operating temperature, up to the point where the cooling system can no longer cope with the engine's heat output.
We made well over 500 horsepower that would run 140°F to 170°F with a simple 3/4" restrictor plate.
|
Of the two photos, the first one has your engine running at absolute optimum coolant temperature. Maybe even a little cooler than absolute optimum. WTF you would want it to run so cold is a mystery to me, and everyone else who undersands how diesel combustion works. Overheating is not good. It's bad. But running way below fully warmed-up is not good either.
I thought that you installed the cold therm because your engine was running hot out in the desert and it makes it run colder. But that's not the case, if the first pic was taken on a hot day.
