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Angel B.
Dodge Dakota
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10/15/2005
00:54:20
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 Subject: 180 degree Thermostat
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Does any one know a "GOOD" part number for a 180 degree thermostat from any of the local auto parts stores. I have a 01 4.7ltr Dak QC. and I have had no luck with the part numbers that I have found in the previous posts. Maybe a link to a website, or maybe the actual truck that a 180 degree thermostat comes off of that fits my truck.
let me put it this way, anything that will help me get a 180 degree Thermostat for my truck.
Thanks
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Rob C
Dodge Dakota
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10/15/2005
14:31:25
| RE: 180 degree Thermostat
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Mr. Gasket 4364
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Rob C
Dodge Dakota
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10/15/2005
14:33:33
|  RE: 180 degree Thermostat
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BTW, did you read this thread?
http://dodgedakotas.com/boards/v8/1260-1.html
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Angel B.
Dodge Dakota
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10/16/2005
23:25:25
|  RE: 180 degree Thermostat
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Thanks Rob, I am going to go out to the parts store tomorrow. I still dont undetstand that bypass port thing:
"You might consider using some JB weld to glue some kind of restictor into the bypass port behind the T-stat when you replace yours that's what I'd like to do when I get a chance."
-If you give me a little more detail on exactly what to do, I will try it.
" I just put a 4364 in a couple weeks ago and the engine is only running at about 205 but, it's staying consistent and not spiking up to 240 like the old Stant 180* I'd installed last year."
-So what you are saying is that eventhough you are installing a 180 degree thermostat, your engine isnt really kept at 180 degrees??
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Rob C
Dodge Dakota
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10/17/2005
22:27:11
| RE: 180 degree Thermostat
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Yes, installing a 180 thermostat doesn't mean your engine will run at 180 degrees because there are more factors than just the thermostat opening at 180 degrees, there's ambient temperature, whether you're running a clutch fan (I pulled mine off), what temperature your electric fan kicks on (this is controlled by the PCM with a factory setting of about 220 degrees) whether you're in heavy traffic or cruising down the interstate. That was during the hot summer months. The factory thermostat has an extension that partially restricts the waterpump bypass port when the engine reachs operating temperature, this provides more flow through the radiator for better cooling. The purpose of the bypass is to aid engine warm up by recirculating coolant within the engine block instead through the radiator. Once your engine is hot, you don't want to keep that hot coolant in the engine block, you want to send it to the radiator unfortunately, after market thermostat don't have a way to restrict the bypass port like the factory thermostat does. The RobertShaw style (which the Mr. Gasket is) themostat flows more coolant and provides more consistant flow instead of cycling open-closed-open-etc. When you pull the factory thermostat out, you'll see the bypass port that the thermostat extension fit's into. I'm guessing that if you restrict the bypass port, more coolant will flow through the radiator instead of recirculating in the engine block, thus providing better cooling.
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steve-o
Dodge Dakota
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10/18/2005
14:10:25
|  RE: 180 degree Thermostat
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dude if you restrict that port, coolant wont cirulate through the heads and block before the thermostat opens, and even then you wont get proper circulation through the heads...the heads are the hottest part of the engine and when you have a standard flow coolant system, the water jackets in the heads are the last to see the fresh coolant that was pumped through the block... running your truck at 180 degrees will just wear the cylinder walls down faster anyways.
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Science Guy
Dodge Dakota
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10/18/2005
15:10:12
| RE: 180 degree Thermostat
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steve-o, who told you that running at 180 degrees will wear the cylinders wall faster?
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jayb
Dodge Dakota
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10/18/2005
16:31:59
| RE: 180 degree Thermostat
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putting a 180 in doesnt do anything. and even if it did, the engine was designed to run at a certain temp for a reason.
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SinCity R/T
Dodge Dakota
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10/18/2005
16:37:43
| RE: 180 degree Thermostat
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Robertshaw automotive thermostats were bought out by a company, which was bought out by another company, which was bought out by another company... They are now being released as Prestone Extended Life II thermostats and can be found at your local Checker/etc. stores.
755-180 is a good thermostat for 3.9L V6, 5.2L V8, and 5.9L V8 motors.
SinCity R/T
http://www.dakota-durango.com
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Angel B.
Dodge Dakota
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10/18/2005
18:40:35
| RE: 180 degree Thermostat
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Hey sincity, why isnt the 180* thermostat good for the 4.7? you listed every other motor, why not the 4.7?
I dont see how lowering the temp of the engine wears down your cylinder walls, can you explain Steve-o.
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SinCity R/T
Dodge Dakota
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10/18/2005
18:52:52
| RE: 180 degree Thermostat
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I don't own a 4.7L to know for certain but I've heard that the 4.7L motor has a slightly different thermostat opening than the other V8's. Some other people have said they used the 5.9L V8 thermostat in their 4.7L V8 and didn't have any problems.
SinCity R/T
http://www.dakota-durango.com
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Anthony
Dodge Dakota
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10/18/2005
20:13:34
| RE: 180 degree Thermostat
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The only difference is that the 4.7 needs a notch cut out on the gasket for it to work with the 5.2/5.9 t-stats.
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Rob C
Dodge Dakota
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10/18/2005
21:44:43
| RE: 180 degree Thermostat
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steve-o, what the heck are you talking about? It's the coolant bypass port, the port that allows coolant to bypass the radiator and recirculate back into the engine, not the main coolant passage. If it would cause a reduction of coolant flow through the block and heads, why do racers totally plug the port off? Also, yes running your engine too cold will cause additional wear on your engine but 180 degrees isn't exactly cold. Plus, a 180 degree thermostat doesn't mean your engine will run at 180 degrees, do a little research before you post this stuff and cause unnecessary confusion!
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steve-o
Dodge Dakota
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10/21/2005
15:13:37
| RE: 180 degree Thermostat
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slightly lowering the running temperature of your coolant system does more than you think, especially if your truck is a daily driver. not only does it wear parts faster, but (especially the 4.7) sludge can build up in your motor oil from running under temp. rob c - most race motors perform the best at around 210, cup series motors run an average of about 230. racers also shallow their water jackets to give the cylinder walls more support, but that doesnt mean you should. you and most of the people that own dakotas dont have race motors, and you shouldnt treat yours like race motor.
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Rob C
Dodge Dakota
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10/22/2005
00:02:09
| RE: 180 degree Thermostat
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As usual, someone gets on here and wants to argue without reading what the other people are saying.
First of all, putting a 180* thermostat isn't going to make your engine run at 180*, except maybe in extreme cold weather.
Since I don't have a race motor, why do I care what temperature certain race motors run at when they're doing very high rpm for extended periods? My engine isn't going to be doing that. If those race engines were operated like my engine, they'd probably be running at 140* or less. I brought up the race engine because they do everything to get the best performance from every part of engine, including the cooling system. You're not suggesting they block off the bypass port because they're trying to get their engines to run hotter, are you? If you are, maybe you could explain why they don't use a thermostat either.
The API (American Petroleum Institute) did a research study on engine oil and how it reduces friction at various temperatures (I think it was done in the 70's with petroleum products). They discovered that once your engine oil temperature dropped below 180* the wear due to friction increased slightly. As the temperature dropped even more, the wear increased exponentially instead of linearly. In other words, if the wear due to friction was less than 1% at 195* and 3% at 175 it would be something like 10% at 160. However, the chart showed very little difference between 195* and 180*. It looked something like a tc chart for a capacitor only reversed. Once the oil temperature dropped below that important 180* mark, the wear really started to increase. But, you have to take into account that the oils were at 1970's technology where the grades were like SC or SD and there weren't any synthetics being marketed yet.
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steve-o
Dodge Dakota
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10/22/2005
20:00:02
| RE: 180 degree Thermostat
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im suggesting that you dont know enough about the cooling system to put up a valid arguement. the oil temp is never going to be the same temp as the coolant temp, so thatvoids out everything you said after that. regardless of whether or not your engine will run at 180 - 185 - 190 after installing a 180 stat, it will run at a lower tempurature than the manufacture intended, hence, causing parts to wear quicker. the bottom line is, your PRODUCTION engine was designed to make power while reducing engine wear, and emissions at the same time, and when you go against the manufacture's specs, youre running your engine in an environment that it wasnt designed for. in all situations - when power goes up, durability goes down. now you decide between the two.
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Rob C
Dodge Dakota
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10/23/2005
12:28:10
| RE: 180 degree Thermostat
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Damn steve-o, you're just a dumbass who doesn't know it! I tried to be civil but, you just keep coming up with more BS in an attempt to make yourself look knowledgeable on the subject. In case you haven't noticed, people come on this forum to discuss things like; how to make more power, what mods make more power, how much power can I expect from mod X, etc. Not how to be a responsible driver, practice reading the owners manual and operating our vehicles like the manufacturers say. The car companies build a vehicle for a specific purpose then make sure they comply with all the federal emission and safety regulations, basically making a lot of compromises. Many of us remove some of those compromises to help increase power. When you increase power, you generate more heat or don'y you know that?
As far as your comment about my lack of knowledge, you're the one who's already proven that you don't know what you're talking about with that statements about the coolant bypass port and about the coolant and oil temperatures never being the same, as if I ever said that.
What exactly is your objective here? To tell us not to modify our vehicles? Many of the statements you've made are either misleading or just plain wrong. Do you even own a truck? You can keep typing your garbage but, I don't think you're going to win over anybody, especially since you don't have your facts straight.
Maybe the Sierra Club has a forum where you can chat with some friends.
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toolfan
Dodge Dakota
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10/23/2005
13:57:36
| RE: 180 degree Thermostat
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i don't run a thermostat so i don't know what temp my engine is running at. IS THIS BAD?
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Rob C
Dodge Dakota
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10/23/2005
14:16:49
| RE: 180 degree Thermostat
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Yes! Why would you not have a thermostat in your engine?
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shutthehellup
Dodge Dakota
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10/23/2005
17:44:36
| RE: 180 degree Thermostat
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both of you need to shut your traps. rob, steve-o has not said one word of false information, it's all true, but irrelevent to this forum. most people that read these forums dont care about "durability" and engine life. steve-o, you sound like a knowledgable technician, but anytime you upgrade engine parts, you are dealing with shorter engine life (not just a lower temp. thermostat.). there was never a need for arguement here because you both have valid points, so lets just try to get along and stop butting heads.
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Rob C
Dodge Dakota
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10/24/2005
00:37:47
| RE: 180 degree Thermostat
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Who the hell are you? Just some idiot that's too chicken to use his real handle and too ignorant to know who's knowledgable and who's not.
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