C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Temperature Differences

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Old May 19, 2009 | 02:13 PM
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Default Temperature Differences

There are two LT4's in our household, both used as daily drivers.

One has 84K miles, long-tube headers, and a Corsa exhaust (and has been tuned).

The other is a stock (except for opened air box) car with 67K miles.

The 67K car usually runs its coolant 10-20 degrees cooler than the oil, while the 84K car is the exact opposite, its coolant runs hotter than the oil.

Just found this interesting and wondered if anyone has an explanation for what is going on...
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Old May 19, 2009 | 03:34 PM
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The one with the headers and it's tune I would guess has a lower thermostat in it.
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Old May 19, 2009 | 09:14 PM
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Originally Posted by 65747785
The one with the headers and it's tune I would guess has a lower thermostat in it.
But that's the one that runs the higher coolant temp...
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Old May 19, 2009 | 10:23 PM
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Originally Posted by Driver84
But that's the one that runs the higher coolant temp...
What are the actual typical temperatures???


After car is warmed up the oil should be 10 or so degrees warmer than the coolant...or at least that is how mine has always operated

My first guess from your info would be the car with the coolant hotter than the oil has a bad coolant temperature sensor...

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Old May 19, 2009 | 10:27 PM
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Originally Posted by LT4BUD

My first guess from your info would be the car with the coolant hotter than the oil has a bad coolant temperature sensor...

I have been hearing a lot about temp sensor problems. My ex has a 94 Camaro that has a defective one.
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