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Old 01-31-2012, 11:17 AM   #1
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A cool engine

When I bought my mustang my cousin said he put a 93 cobra waterpump pulley in it And a 165 degree thermostat. So my engine barely get over 140 degrees. This won't hurt anything will it? I always thought a cool engine is a good thing.
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Old 01-31-2012, 11:53 AM   #2
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I would put a stock or at least 180 in it.a cool air charge is good but not cool engine.
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Old 01-31-2012, 12:01 PM   #3
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Originally Posted by dreamstang
I would put a stock or at least 180 in it.a cool air charge is good but not cool engine.
You want it to get out of the cold loop though and 160* won't do that.. I'll be switching to a 180* as well.
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Old 01-31-2012, 12:50 PM   #4
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Re: A cool engine

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Originally Posted by 89white GT View Post
When I bought my mustang my cousin said he put a 93 cobra waterpump pulley in it And a 165 degree thermostat. So my engine barely get over 140 degrees. This won't hurt anything will it? I always thought a cool engine is a good thing.
I don't remember which thread in this forum I recently posted some info about this, but you are better off for numerous reasons to leave the stock temperature thermostat in the engine.
First and foremost is that cooler T-Stats cause increased cylinder wear.
And, the entire EEC IV system is designed to run/tune at the factory designated temperature.
The "only" time you might want to run a cooler T-Stat, is on a race only vehicle.

Here is what I found on the net. It pretty much agrees with what I read in my book.
Change (or remove) the factory thermostat

This is based on the fact that cooler air is denser, so the less you heat the air coming into the engine, the more air/fuel mixture you can pack into each cylinder. An old shade-tree mechanic fix, but it's got several strikes against it. First, you never want to remove the thermostat completely. The cooling system has been designed with the thermostat restriction in mind, and removing it will actually hurt cooling. Second, cylinder wall wear increases as operating temperatures are lowered. The stock Mustang thermostat is set for 196° Fahrenheit. Dropping to 180° will increase wear somewhat, and dropping to 160° or 140° will increase wear dramatically.
On EFI cars, cooler thermostats are rumoured to increase performance because the engine will run richer at temperatures below 180° Fahrenheit. True, the EEC-IV will richen the mixture, but staying in "warm up" mode entails more than just a richer mixture. The EEC-IV will be more conservative with the timing curves, and will never get into "closed loop" operation (where it uses the oxygen sensors to fine-tune the mixture). The result will likely be poorer drivability and _decreased_ performance. Also, catalytic converters can be damaged over time by an engine that's continually running rich.
VERDICT - Don't remove the thermostat entirely, and don't use a thermostat below 180° Fahrenheit on an EFI car.
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Old 01-31-2012, 01:41 PM   #5
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So with a stock thermostat what temp would it run at?
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Old 01-31-2012, 01:42 PM   #6
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Think 212*
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Old 01-31-2012, 01:51 PM   #7
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So did the cobra's have a different T stat or did they run cooler?? Why are the water pump pulleys smaller on the cobra?
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Old 01-31-2012, 01:56 PM   #8
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Quote:
Originally Posted by 89white GT
So did the cobra's have a different T stat or did they run cooler?? Why are the water pump pulleys smaller on the cobra?
Not sure about the Cobra Tstat, but generally when pulleys are smaller means they will spin faster(helping w/ cooling?).
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Old 01-31-2012, 01:58 PM   #9
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Well ya. But you would think if it was for that simple reason they would've used them on all 5.0 motors
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Old 01-31-2012, 02:13 PM   #10
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Re: A cool engine

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So with a stock thermostat what temp would it run at?
What I read said stock they use a 192 or 195 degree thermostat and the system is designed to run at 200 degrees.
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Old 01-31-2012, 02:15 PM   #11
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Re: A cool engine

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So did the cobra's have a different T stat or did they run cooler?? Why are the water pump pulleys smaller on the cobra?
Don't know about the different T-Stat.
The pulleys may have been UD to pick up some extra HP for the Cobra.
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Old 01-31-2012, 02:16 PM   #12
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Originally Posted by 89white GT
Well ya. But you would think if it was for that simple reason they would've used them on all 5.0 motors
The difference is the Cobras and Cobra Rs are slightly more race oriented stock v. Stock when compared to an LX or a GT, imo of course.
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Old 01-31-2012, 02:18 PM   #13
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Originally Posted by Trojan Horse

Don't know about the different T-Stat.
The pulleys may have been UD to pick up some extra HP for the Cobra.
Aren't there a few other upgrades to the Cobras?
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Old 01-31-2012, 02:26 PM   #14
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Re: A cool engine

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Aren't there a few other upgrades to the Cobras?
Yes, I was just thinking that might be one of them.
I'm not 100% sure and I'm too tired to search it out right now.
Plus since none of us has one I guess it doesn't really matter.
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Old 01-31-2012, 05:48 PM   #15
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Quote:
Originally Posted by Trojan Horse

Yes, I was just thinking that might be one of them.
I'm not 100% sure and I'm too tired to search it out right now.
Plus since none of us has one I guess it doesn't really matter.
Haha! Very good point Trojan!
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