Gen 3 coyote Mustang, engine problems overheating

[mike8400]

Hey so I have fiends car that give maintance, a gen3 coyote mustang 2019 and we are having some problems and wanna ask if someone here has ever have this problem.
The car temperature while you cruise o have normal drive it’s always good between 195 en 208 f but as soon you give WOT the car raise the temperature crazy, up to 250 f (coolant temp) we have a Ford performance coolant pump, new thermostat, mishimoto 3 way pass aluminum radiator everything and the temperature raise really quick and that high, no problems on the coolant no extra pressure on the hoses no smoke nothing.
After that we check the cylinders with a camera and we saw this on the pictures that I attached

It will be very helpful I you can give me an idea of what can be causing that

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[engineermike]

Coolant temp or cylinder head temp?

 

[BrakeFade]

You sure you got all the air out of the system? Using 50/50 mixture of coolant and distilled water?

 

[WItoTX]

Along with the other suggestion, I'd consider trying another thermostat.

 

[2015 Silver GT]

What was wrong with the stock setup that required deviating from it?

 

[mike8400]

Coolant temp or cylinder head temp?

Cylinder head temp

Coolant temp or cylinder head temp?

CYLINDER HEAD TEMP

 

[mike8400]

What was wrong with the stock setup that required deviating from it?

Nothing wrong and we though that maybe upgrating the coolant system wil help, but nothing

 

[mike8400]

You sure you got all the air out of the system? Using 50/50 mixture of coolant and distilled water?

yeah all that its good the correct oune for a ford mustang

 

[Timbuck]

Those cylinders look kind of dry , patchy and rusted ?

how do each cylinder look on a compression test ??

are you running E85 ??

also are you sure both fans are operating correctly ??

 

[engineermike]

Cylinder head temp

The CHT is a temp sensor directly on the metal of the cylinder head. The metal temp reacts to load changes much quicker than water temp. What you're seeing might be normal. I'd log ECT just to see what the PCM thinks it's doing as a result of the CHT changes.

 

[2015 Silver GT]

Nothing wrong and we though that maybe upgrating the coolant system wil help, but nothing

Help what? Were you having problems before the changes?

 

[EFI]

I'd log ECT just to see what the PCM thinks it's doing as a result of the CHT changes.

Is there an actual sensor for the coolant? Or is that value calculated from a bunch of different parameters like the "oil temperature" value.

 

[Skye]

In processing the marks on the cylinder walls...

Car is a 2019. Does this engine have a history of repair? Cylinder heads off? Pistons removed? Prior internal mechanical failure and damage?

I don't know what I'm looking at, the "splash" marks on the cylinder walls. I feel like the engine block has seen some prior damage. Either the original engine has been rebuilt, or this block is a donor from another vehicle.

 

[WItoTX]

Is there an actual sensor for the coolant? Or is that value calculated from a bunch of different parameters like the "oil temperature" value.

Correct. I think Kevin (Honeybadger) did some videos on actual temps vs calculated temps. Might have been someone else. But the data is out there somewhere.

 

[engineermike]

The CHT is a temp sensor directly on the metal of the cylinder head. The metal temp reacts to load changes much quicker than water temp. What you're seeing might be normal. I'd log ECT just to see what the PCM thinks it's doing as a result of the CHT changes.

ECT is calculated, but the numbers should line up better to what you expect. If comparing CHT to traditional ECT it won’t line up.

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