Author Topic: thermostat; 185 or 195?  (Read 1534 times)

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Offline Gerhart

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thermostat; 185 or 195?
« on: July 11, 2011, 02:39:45 AM »
My factory manual says OEM thermostat was 185 degrees, but my parts suplier (rockauto) remarks 195 degrees as OEM setting.
This is for my '77 W200 with 318.

The truck came with a 185 (sticky) thermostat which I exchanged for a 190. With the 185 thermostat, the temp gauge was always on the lower side; summer and winter. Only with heavy towing during summer, the needle rose to the center of the scale.
This ofcourse with the fixed fan and extra large radiator as standard M880 equipment.
The 190 thermostat only made a little difference in temp reading (slightly higher).

New set up is with dual electric fans and large aluminum radiator.
So can I safely use the 195 stat?
Other option is a 180 stat, but I guess this is way too low for my application.
'77 W200 (former M880), 318, TF 727, NP 203, D44FBJ(F), D60(R), WIP: complete restoration
http://ramchargercentral.com/projects/lowlands-dodge/

Offline bigdog440

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Re: thermostat; 185 or 195?
« Reply #1 on: July 11, 2011, 03:11:27 AM »
i always run a lower t stat, lower temp helps with power but also you dont get alot of heater heat when its cold. heat kills hp any bolt on kits or high hp componets companies recomend a low t stat. have gone as low as 160 degree t stats and never had a problem.  ;)
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Offline Gerhart

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Re: thermostat; 185 or 195?
« Reply #2 on: July 11, 2011, 01:55:21 PM »
What I am afraid of is going too low.
I hear you on the high temp setting; high temp kills power. But going too low isn't good for the engine itself.
Perhaps the 180 stat is the better choice?
'77 W200 (former M880), 318, TF 727, NP 203, D44FBJ(F), D60(R), WIP: complete restoration
http://ramchargercentral.com/projects/lowlands-dodge/

Online ToxicDoc

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Re: thermostat; 185 or 195?
« Reply #3 on: July 11, 2011, 03:16:26 PM »
Carburetor of EFI?  That is the more important question.  Carb you can go 180-185.  For EFI you need the higher temperature for oem calibrations.
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Offline chrysler300le

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Re: thermostat; 185 or 195?
« Reply #4 on: July 11, 2011, 09:19:22 PM »
Nothing wrong with 195 thermostat.  That is standard in many carbed chrysler engines. I've tried 180 degree thermostats in past but didn't like the lower heater output in the winter.  So your choice may depend on geographic area.
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Offline Gerhart

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Re: thermostat; 185 or 195?
« Reply #5 on: July 12, 2011, 05:31:35 AM »
Engine is a carbed version.
My main concern is the general health of the engine; which temp is best for it?
Second concern is indeed the heater output; winters can be rather cold overhere.
I know that radiator fan settings are important as well, but my first concern is the t stat.

So that wil be my next question; what temp to set my radiator fans?
'77 W200 (former M880), 318, TF 727, NP 203, D44FBJ(F), D60(R), WIP: complete restoration
http://ramchargercentral.com/projects/lowlands-dodge/

Offline KThaxton

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Re: thermostat; 185 or 195?
« Reply #6 on: July 12, 2011, 08:58:13 AM »
There is really no logical reason to use a lower t-stat than stock. AFAIK, 195 has always been stock for sb's (I could be wrong however, I was once before :P). The engines are designed (tolerances etc) to run at that temp.
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Offline Gerhart

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Re: thermostat; 185 or 195? and temp setting for electric fans?
« Reply #7 on: July 12, 2011, 12:44:38 PM »
There is really no logical reason to use a lower t-stat than stock. AFAIK, 195 has always been stock for sb's (I could be wrong however, I was once before :P). The engines are designed (tolerances etc) to run at that temp.

My FSM says D&W100 with V8 195; D&W200 and up with V8 185.
All slant 6 195.
Haynes says up to 1976 as above; 1977 and up all 195........
Looks awkward to me; 100 and 200 have the same engine and cooling system, but different temps.
Perhaps just a weight issue....

Guess 195 won't hurt.

So.. with a 195 t stat; what temp setting would be advisable for my (dual) fans?
'77 W200 (former M880), 318, TF 727, NP 203, D44FBJ(F), D60(R), WIP: complete restoration
http://ramchargercentral.com/projects/lowlands-dodge/

Offline chrysler300le

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Re: thermostat; 185 or 195?
« Reply #8 on: July 12, 2011, 09:21:37 PM »
Come on at 200 degrees.  Shut off around 185-190.  Try that and see how that works.
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Offline Gerhart

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Re: thermostat; 185 or 195?
« Reply #9 on: July 14, 2011, 01:52:26 PM »
So 200 for the primary fan. And 210 for the secondary?
'77 W200 (former M880), 318, TF 727, NP 203, D44FBJ(F), D60(R), WIP: complete restoration
http://ramchargercentral.com/projects/lowlands-dodge/

Offline chrysler300le

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Re: thermostat; 185 or 195?
« Reply #10 on: July 14, 2011, 08:44:00 PM »
Try it and see how you like it.  I'm guessing you can adjust for your taste later.
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Offline 80dodge4x4

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Re: thermostat; 185 or 195?
« Reply #11 on: July 15, 2011, 04:39:54 AM »
I agree now I think with the 195 T stat. THese smallblock mopes are cold natured sob's. seems like it takes forever for the sucker to wrm up and when it does it barely gets up on the gauge. Not a good thing with the qjet either that seems not to like the cold engone. And this is in the summer that im talkin about! I think im gonna try one. defintly in the winter (i coukd prolly remove the fan this winter with no ill effects)
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Offline Gerhart

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Re: thermostat; 185 or 195?
« Reply #12 on: July 15, 2011, 02:02:07 PM »
Thanks for all the replies. Wasn't sure where to start; now I've got my base line.
'77 W200 (former M880), 318, TF 727, NP 203, D44FBJ(F), D60(R), WIP: complete restoration
http://ramchargercentral.com/projects/lowlands-dodge/

Offline minnesota guy

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Re: thermostat; 185 or 195?
« Reply #13 on: July 26, 2011, 12:48:52 PM »
From the studies I have seen, the engines get less wear with more heat..up to a point.....For wear, It seems that the 195 degree is best.  I dropped one in my 1987 w150 with a freshly rebuilt 440 and a nw Autozone truck 440 radiator.  Stays at the 195 consistently, and in Minnesota It runs much better in colder air.
The 180 degree'rs seem to run a little to cool in the northern climate.  As that is what I ran regularly in the 360 when it was in there.  The 1987 360 still had a 192-195 degree thermostat from factory. :)