Electric Fan, Operating Temp, Water Temp

[AnthonyR23]

Hi, I posted a thread awhile ago with some questions. I have a 180 t stat. and just purchased a fan that I haven't received yet. A mark 8 electric fan. has a high and low setting. I learned that a good all around operating temp is 200 and was given advice to start at 195 on, 187 off. Anyways, so the relay kit that comes with the mark 8 fan comes with:

Instructions for 2 different configurations
5 Prong Relay
Female Relay socket w/ harness
Inline Thermostat switch
14 total feet of wiring
8 connections
1 Fuse Buss or Circuit Breaker (where available)

I haven't received it yet but should be here today or tomorrow. The fan is said to pull 2500 cfm on low and 4000 cfm on high.

The relay will allow the fan to turn on low when the Coolant temperature reaches 155ºF or turn the fan on low at start up and then to high at 155ºF. The screw in Thermostat switch can be replaced with a temperature switch of your choosing from a local parts store, if a lower temperature is desired. The set up was designed for Ford Lincoln Hi-performance two speed electric fans.

I would like to use both the high and low. So if the proper operating temp is supposed to be around 200 then I want it to pretty much stay within that.. I think I read somewhere that the water temp is usually about 10 degrees less then operating temp. Is that right? So if water temp is 190 does that mean the operating temp is probably around 200. So if I have the fan turn on high at 195 that would be trying to cool down the coolent once the engine hits 205 (195 + 10) should I set the low speed to 190 (operating temp 200)?? I'm a little confused. Is the 180 t stat measuring the fluid cooling in the rad. or engine the engine. Kinda confused... Doesn't seem right..

Should I put the 192 degree thermostate back in? Seems like that would be a good idea for emissions. Because a warmer engine burns up more of the fuel. I think the fan on low at start up to cool the rad fluid, then high at 155 sounds good. That is with the 192 degree thermostate. Because then when it hits 192 assuming that is measuring the water temp in the engine not the water temp in the rad then it will cycle the cool fluid. Should I leave it alone. What temp should the water be at for 200 degree operating temp 190 ish... ?????????

 

[AnthonyR23]

Just to add to what I wrote. I can pretty much figure this out on my own but it could be a bit of a debate because I have heard alot of different things. Which have obviously confused me. A couple questions:

When people refer to operating temp.. are they refering to just water temp in the engine or just how hot the engine actually is?

I would guess that it refers to engine temp because if proper operating temp is 200 then lets say water temp should be 190 if the 10 degrees less is correct.

If any of this should be corrected please go for it.. It would be greatly appreciated.

K, so if I am right then the stock 192 thermostate is technically supposed to switch out the hot 192 degree coolant because the engine operating temp is over the correct 200 and is at 202 if the 10 degree assumption is right.

People have wrote me that I shouldn't have the mark 8 fan running all the time because it will not let the engine reach the proper operating temp.. To me that is confusing because if the 192 degree thermostate (I actually have a 180 but am highly considering putting the 192 back in). I realize that the 180 will make the engine run a bit cooler which will make it run a bit more rich which is fine for those who do not have to deal with emissions. I will probably toy with both thermostates and see what emissions I can get away with. Do you think with a 192 which should improve emissions would I be able to run an off road h pipe. or not.

Ok so if I can't run the off road h with the 192, then I probably can stick with the 180 and the stock h pipe to still pass emissions.

But with the fan running all the time the coolant will be extra cold and will cool the engine off better but what if I just run the fan all the time at low speed. Still to cool. The engine won't cycle until it heats back up, but maybe the up down won't be a good thing.

People have also told me that the 160 degree thermostate is no good because it doesn't give the coolant a chance to cool of enough because the engine cycles to often. Wouldn't the fan running on high all the time and a 160 degree thermostate maybe work. Because if it cycles more often then it won't cool of the coolant too much. because it is cycling more. What do you guys think?

So I guess the goal for me is having a little extra power so maybe running a little cooler than 200 but still being good with emissions. Has anyone managed to run an offroad h pipe and still pass emissions with different setups???

 

[AnthonyR23]

on and on

Another question. Lets say the engine operating temp hit 202. Which is pretty hot. How long would it take for really cool coolant to cool of the engine. I just have a feeling I may be able to just run the fan all the time with a 192 without worrying about operating temp. Or even with a 180