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Old 04-02-2019, 03:02 PM   #141
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I guess I'd still call 20-25 deg F a fairly narrow range. My caution is mostly based on people who have a valve thermostat that can be completely removed which completely circumvents regulation, and will cause harm from over-cooling under lower load conditions or ambient temperatures.

I do agree that lower cylinder temps have a lower chance of detonation. My Supra runs a slightly lower temperature thermostat, but more importantly, it runs a significantly upgraded radiator to help the thermostat regulate engine temperature, and not allow it to ramp up as much under heavy load.

My question would be that if in all cases, lower temperatures make the engine more reliable and more able to make more power... Why would Ford's (And Toyota, Honda, GM, Nissan, Volvo, Porche, etc etc etc) not just choose the lowest possible operating temperature thermostat and make that the standard?
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Old 04-02-2019, 04:47 PM   #142
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Quote:
Originally Posted by SupraGuy View Post
I guess I'd still call 20-25 deg F a fairly narrow range. My caution is mostly based on people who have a valve thermostat that can be completely removed which completely circumvents regulation, and will cause harm from over-cooling under lower load conditions or ambient temperatures.
If you have a 180 deg thermostat and you get to 180 deg the thermostat will close to avoid the engine running to cool , the Focus , all year has a removable Thermostat , Most cases the engine runs 185 to 200 deg

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Originally Posted by SupraGuy View Post
I do agree that lower cylinder temps have a lower chance of detonation. My Supra runs a slightly lower temperature thermostat, but more importantly, it runs a significantly upgraded radiator to help the thermostat regulate engine temperature, and not allow it to ramp up as much under heavy load.
A new/larger Raid isnt really needed unless you cant keep the temps down with a stock Raid something we havent run into on the Focus even making over 700 whp

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Originally Posted by SupraGuy View Post
My question would be that if in all cases, lower temperatures make the engine more reliable and more able to make more power... Why would Ford's (And Toyota, Honda, GM, Nissan, Volvo, Porche, etc etc etc) not just choose the lowest possible operating temperature thermostat and make that the standard?
The Ford's (And Toyota, Honda, GM, Nissan, Volvo, Porche, etc etc etc) Have a set amount of time to fire off the CAT to pass emissions , if the CAT doesnt fire off they dont get the OK to manufacturer the engines , One of the ways to help pass the emission test is make the water temps in the 230-240 range which makes the combustion / Cyl temps hotter which fires the CAT sooner

Its all for emissions , if you look back to the days of small block Chevys 190 was hot , to hot , 200 deg you shut it off

Tom
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