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Unread 07-01-2015, 08:42 PM   #1
Rebel1970
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Thermostat

What is the best thermostat to run? A 195, 180, or a 160? No thermostat at all. And yes I realize that a thermostat is needed in the winer. I am talking a good all around thermostat for all seasons.

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Unread 07-01-2015, 09:05 PM   #2
tripmaker
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I use a 180.

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Unread Yesterday, 05:03 AM   #3
Mike Romain
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The proper one for a 258 is a 195. The engines run best warmed up, same goes for internal heat.
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Unread Yesterday, 05:07 AM   #4
keith460
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195, that's what it came with and is designed to use.
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Unread Yesterday, 06:23 AM   #5
swatson454
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I'm a 180 fan, unless it gets pretty cold in the winter. Today's fuel vaporizes better than the stuff back in the 70s and 80s so you don't have to run the engine as hot to get there. 195s are just fine too but that's as hot as I'll ever go.


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Unread Yesterday, 06:59 AM   #6
WindKnot
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195° is what's called for. Even in the summer here in Arizona.
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Unread Yesterday, 09:44 AM   #7
CrustySprings
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I have always used a 180 degree stat. On long highway drives in the summer here in the high country of Colorado, I have noticed that the temp usually creeps up to about 192. I assume the 258 inline six's thermo-dynamic characteristics were designed to operate at this temp.
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Unread Yesterday, 11:49 AM   #8
hp_lovecraft
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Years ago when I used to tow with my Jeep, I'd run a 160f. The idea being that it would start to overheat when towing up a steep hill, but settle back down to 160 otherwise. That extra 25 degrees was to give you some extra time before the temp reached the danger zone.

Thats the idea anyway. Not sure if it really worked that way. Nowadays, just run the 195f but I don't tow with the Jeep. Its scary enough as it is!
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Unread Yesterday, 01:04 PM   #9
captkhaos
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Hey Reb,
I run a 180 myself but hey... it's Florida. Like Mr. Lovecraft said, I like that extra time before it reaches the "danger zone". BTW, my temp gauge never gets much off the peg.
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Unread Yesterday, 04:13 PM   #10
ECJ-7
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if your cooling system works properly then it doesn't matter what temp you use, and since the engine was designed to run at 195, that should be your choice.
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Unread Yesterday, 04:43 PM   #11
swatson454
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Quote:
Originally Posted by ECJ-7 View Post
if your cooling system works properly then it doesn't matter what temp you use, and since the engine was designed to run at 195, that should be your choice.
That was dictated by the fuel, emissions requirements and knowledge of the day.


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Unread Yesterday, 04:50 PM   #12
rons75
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Almost all engines require a 195* now a days, not only for fuel but to let the engine oil do its job properly
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Unread Yesterday, 06:04 PM   #13
swatson454
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Our Mercedes SUV runs at 82*C which is ~180*F. I'd think the Germans know a thing or two about cars.

A 195 is a good, all-around temp but there's more to life than a 30 year old FSM and things have changed. I ran a high-flow, 180* with no intake heat in the Las Vegas summer. Power was up (not a lot but definitely noticeable) with no downside.

To each his own


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Unread Yesterday, 08:50 PM   #14
Rebel1970
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Thanks for the input, 195 it is.
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