better Themostat for the 6.0? - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 11 Old 04-20-2019, 12:33 PM Thread Starter
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better Themostat for the 6.0?

Hello,
does anyone know a thermostat for the 6.0 that opens more/wider, or can I machine it, for more opening at operating temperature?
My coolant is since the EGR delete approx. 10F colder in comparison with EGR cooler. (coolant pressure now 0-7 psi, with EGR cooler up to 18psi)
My camper is very heavy with 6.5 metric tons.
Today I measured the temperatures at the upper and lower radiator hose. At ECT 84C (183F) on the display there is only 66C (151F) on the upper hose and 44C (111F) on the lower hose. I think, the thermostat does not open completely. When I remove the thermostat, the engine warms up very slowly.
Is there a thermostat that opens further, so let more coolant to the radiator?

Thanks from Germany





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post #2 of 11 Old 04-20-2019, 04:23 PM
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What is your end goal ? Rad temp does not matter engine temp does .

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post #3 of 11 Old 04-20-2019, 05:25 PM
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Not an expert here so will also say that the speed of coolant is also important as it needs time to move it so this is why it may not be fully opening. So have worked with heat exchangers and more plate cooler so if you do tow a lot and it is warm when you do this you may also want to look at a bigger radiator or should I say one with more cores. The thing to be watching is the difference in oil and water temp towing or just normal driving. I hope this helps in your thinking.
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post #4 of 11 Old 04-20-2019, 05:37 PM
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The infrared gun may not read correctly -- different texture and color surfaces will affect the accuracy, a contact thermometer would be best. The thermostat should not open until 90c (195f) -- some heat transfer thru thermo siphon will happen in the upper hose, so it may seem to be passing coolant when it is not.

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post #5 of 11 Old 04-20-2019, 11:27 PM
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Go with an OEM thermostat. The flow will be ok with it. There's a lot of us that tow heavy with the OEM one.
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post #6 of 11 Old 04-21-2019, 12:51 AM Thread Starter
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I want to drive with lower coolant and oil temps. Under load EOT reaches over 212*F. Want to reduce this, better for HPOP, Injectors, O-rings...
Oil cooler is brand new.
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post #7 of 11 Old 04-21-2019, 05:05 AM
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212 oil is fine. Some might say perfect under load conditions.
djmaguire and Hydro like this.

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post #8 of 11 Old 04-21-2019, 06:50 AM
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^^Agree. There is no reason to try and keep it cooler than that. Even poor quality oil doesn’t shear at that temp and could be run constantly at that temp.

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post #9 of 11 Old 04-21-2019, 06:26 PM
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^^^Agree. The diesel engine runs more efficient at higher temperatures, 195F on the coolant is fine

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General note:
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post #10 of 11 Old 04-22-2019, 12:04 AM Thread Starter
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Most O-rings have a maximum working temperature of 110*C (230*F). I am dangerously close to this value. I suspect that the O-rings dies earlier in the HPO system than at low temperatures.
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