[mlbbaseball]

So what are the benefits of this?? I don't understand the entire theory behind this.

 

[1turbofocus]

Im not sure what your asking ?

Tom

 

[Peregrine]

He wants to know if there's any benefit running a lower temp thermo versus the stock one.

 

[Aku]

Helps to keep the motor colder correct? besides that fact they are cheap so just do it anyway

 

[mlbbaseball]

ya, I'm asking, what does this do for your engine. does it give you more performance? is it a safety thing? and how does it work?? I don't see anythilng electrical on it.

 

[Aku]

I believe it opens your thermo at a lower temp adding more coolant sooner to help keep the motor cool. doesn't add more power but helps keep the power you have from making motor go boom

 

[iminhell]

It has to do with ignition timing and open loop operation. Basically it's keeps the car from going into closed loop operation and gives a little more timing, but not much because the car is trying to reach that higher temp. It works similar to the warm up process.
Or at least that's the theory.

 

[Peregrine]

Very well explained^^. Rep points for you since I never really understood the reason in changing to a lower temp thermo either.

 

[1turbofocus]

It has to do with ignition timing and open loop operation. Basically it's keeps the car from going into closed loop operation and gives a little more timing, but not much because the car is trying to reach that higher temp. It works similar to the warm up process.
Or at least that's the theory.

No no , Has little to do with the ignition timing and nothing to do with open/closed loop

With lower engine temps even 10Deg , It lowers the engines oil temp by more , it lowers the knock threshold , lower engine temp (to a point) can = more HP/TQ , helps to lower the combustion chamber temps ,Etc

Tom

 

[RobsRedRacer]

whats the stock temp thermostat set at again? i forget [scratch]

 

[flipwilly2]

I believe, if it's like most Fords, it also causes the ECU to richen up the fuel/air mixture a bit-which should add a little hp/tq. Some guys go down to 160 deg. thermostats-at least for the Escapes.

 

[pistolgripbmx]

Can I ask why from the factory it is set to be higher? I changed my trucks out to a 180, I can't remember what stock was but I know it was greater than 180, just wondering what the reason is for it to be higher from the factory.

 

[iminhell]

^^Emissions.
Through research they have found that an engine that runs near to 210° will produce less harmful emissions. But I'd guess that has to do with the warm up process and rich fuel mixtures.

 

[mlbbaseball]

I believe, if it's like most Fords, it also causes the ECU to richen up the fuel/air mixture a bit-which should add a little hp/tq. Some guys go down to 160 deg. thermostats-at least for the Escapes.

more fuel doesn't mean more hp, actually it means less!! you want to almost be running lean else you have too much fuel and less air in the cylinder and since you cannot use all the fuel and there is less air to combust, you waste gas and get less hp!

anyways, so does anyone have a recommendation as to what degree therm to use?

 

[iminhell]

For what you have, I would say the 180° (alt+0176 btw for the degree sign) should work the best. I mean you technically don't have a DD anymore so it's not like fuel economy is you main concern anymore.

 

[mlbbaseball]

eh, its still a DD, but its harsh. I'll look into the 180, is 170 too low?

 

[iminhell]

I couldn't honestly tell you. What I can tell you is that the ratings vary by manufacturer. The temp rating really shouldn't be the deciding factor. The deciding factor should be the fully open temp reading, which no one publishes. Normally the 170°, 180°, 210° is the temp at which the therm just lifts off the seat and starts to allow coolant to pass through.
I've found that different mfg.'s are fully open at different temps. About all you can do is trial and error for that. I have a 180° here but I don't know the brand, I got it years ago from FC and no stamp on it.

But I don't see 10° making enough difference to dwell on it.

 

[illinipo]

according to thermodynamics, the efficiency of any thermodynamic process (like the air in an internal combustion engine) is directly dependent on the lowest and highest temperatures of the system.

That said, the intake temps and exhaust temps can vary depending on the engine's temperature. This is mainly what would cause a change in performance, in addition to the changes that Tom mentioned.

I currently run in the 220's with spikes to ~240. A little high imo, but havent had any problems yet. And no it does not jump into/outof open loop based on temperature after cold start fueling has ended.

 

[iminhell]

after cold start fueling has ended.

See that is the point I was talking about. I was always told that it would remain in the cold start/warm up fueling if you ran a colder therm. It might have been more of a GM thing but I took it as most cars. But then I don't know the limit at which warm up stops. It's one of the things I never paid attention to when I wan manually logging my car.

 

[illinipo]

hold on i will look at a recent log and see when cold start fuel turns off..... i just so happened to log a cold start with coolant temp and fuel source so ya.... brb