What is normal operating temp for 3FE?

Joined
Feb 19, 2010
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Largo, FL
I'm asking because my stock guage has been acting up lately, so I installed a mechanical temp gauge and I'm trying to dial in my e-fans to the correct temp. I currently have them set to turn on @ 185 and turn off @ 180.

Thanks for the help.
 
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Feb 15, 2009
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Tongnoxie Ks.
will the stock thermostate is a 195 degree
so that would say 195, but you can have 185 degree,
thermostate so it all depends on which thermostate you have.
 

Moby

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Trying to stack dimes
I have an aftermarket Nordskog temp gauge with the sender in the t-stat housing below the t-stat (opposite the stock sender). I have a new OEM t-stat. I have a new aftermarket 4 row radiator. I run dual SPAL 11" fans in a custom shroud with a Delta Current Control variable speed controller. I have it set to come on right around 200. This setup maintains a temp range of 198-203.

I tried running a 185 t-stat but after comparing it to OEM I went back to OEM. The opening is physically larger in the OEM t-stat. I believe that the 185 version I was running was restricting flow. Wasn't a problem unless it was over 100 and I was fully loaded down pulling a grade. The OEM t-stat also seems more sensitive (maintains a smaller range of temp fluctuation with the same fan/controller setup)? May just be perception and not reality though.
 
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I have a thermocouple attached on the outside casting of the engine and it gets up to around 185 on the streets and around 200 on grades. On hot days and pushing it I have seen over 200.
 
Joined
Feb 19, 2010
Messages
97
Location
Largo, FL
Thanks for the info. I have it set to turn the fans on @ 200 and off @ 190. It seems to be working well cruising around town. I'll have to take it on a little road trip this weekend and see how it does on the interstate.
Another question, What is too hot?
I know the boiling point of antifreeze/water depends on the system pressure...but assuming stock cap in good cond. and 50/50 mix, what is the max safe temp?
 

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