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how hot is too hot of an operating temp? #894155
01/02/11 02:15 AM
01/02/11 02:15 AM
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Central TX
roe Offline OP
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360 auto, car in my sig, would a steady 195-200 be too high? and will a car overheat without an overflow tank?



1971 Plymouth Satellite
408/904 8 3/4 3.23 SG
Re: how hot is too hot of an operating temp? [Re: roe] #894156
01/02/11 02:18 AM
01/02/11 02:18 AM
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Manitoba, Canada
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I have a 195* thermostat in my car. Because of that the cooling system is incapable of attaining an operating temp below that rating. That's the whole point. Don't worry about your temp. You won't overheat without an overflow but you will puke coolant all over the ground when you get to temp and the rad cap vents. If you fill the rad and stop an inch or two from the top you'd probably be okay.

Re: how hot is too hot of an operating temp? [Re: roe] #894157
01/02/11 02:33 AM
01/02/11 02:33 AM
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You're OK on the temp. The overflow jug in conjunction w a coolant recovery cap stops the majority of coolant loss (some still evaps as steam out out the jug as it has to be open for it to fill) and after it cycles a few times and gets most of the air out of the system w the coolant right up to the rad cap seal that can let it run a slight bit cooler and lessens rust formation as it needs air to form. To ans your Q if you are overheating (or not) it will be independant of whether you have an overflow system or not. Is that the temp around town or out on the hiway?


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Re: how hot is too hot of an operating temp? [Re: DaytonaTurbo] #894158
01/02/11 02:36 AM
01/02/11 02:36 AM
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how hot is too hot? what temp do inot want to see?



1971 Plymouth Satellite
408/904 8 3/4 3.23 SG
Re: how hot is too hot of an operating temp? [Re: roe] #894159
01/02/11 02:41 AM
01/02/11 02:41 AM
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Manitoba, Canada
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After driving your car for a while you should know what's normal for it to run based on driving conditions. At 230 I would start really keeping my eye on the temp gauge and at 250 I would be calling it. Remember, a perfect cooling system will keep your operating temp right around the rating of your thermostat. So anything higher than that is not ideal but not necessarily detrimental.

Re: how hot is too hot of an operating temp? [Re: DaytonaTurbo] #894160
01/02/11 03:23 AM
01/02/11 03:23 AM
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Florida STAYcation
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ANYone know if there is some type of "gauge" that will show you the operation of the 'stat?

Re: how hot is too hot of an operating temp? [Re: dIc dOc Deity !] #894161
01/02/11 03:34 AM
01/02/11 03:34 AM
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FWIW Ford doesn't even turn on the electric fan on cars so equipped till 221 degrees..

Re: how hot is too hot of an operating temp? [Re: dIc dOc Deity !] #894162
01/02/11 03:58 AM
01/02/11 03:58 AM
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Oregon
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Quote:



ANYone know if there is some type of "gauge" that will show you the operation of the 'stat?




The temp sensor I'm working on for the Mercedes fan controller shows the temp rising right to the thermostat temp, then lowering a few degrees and hovering there (while idling).

Or are you thinking of a sensor that shows how open the thermostat is?


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Re: how hot is too hot of an operating temp? [Re: roe] #894163
01/02/11 04:03 AM
01/02/11 04:03 AM
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Lake Elmo, MN
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It sounds like you have a 195 degree thermostat installed, which is what Ma Mopar recommends our engines have (and what a parts store will give you as a stock replacement thermostat), and running at 195 to 200 degrees would be normal for a 195 degree thermostat, as long as the temp is basically staying steady at 195 to 200.

The things you want to watch out for are:

A stady increase in temp when running down the highway. This would indicate that your cooling system is undersized or plugged up - you're not getting enough coolant flow.

Or

A steady increase in temp when idleing or crusing slowly. This would indicate that there's not enough air blowing through the radiator.


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Re: how hot is too hot of an operating temp? [Re: hooziewhatsit] #894164
01/02/11 04:06 AM
01/02/11 04:06 AM
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Quote:



Or are you thinking of a sensor that shows how open the thermostat is?




Yes .. MORE in this area ....but the Benz idea is good to. That RV project I am working on now ....in the heads and water-pump ... there are all sorts of places to put sensors EVERYwhere.

Re: how hot is too hot of an operating temp? [Re: dIc dOc Deity !] #894165
01/02/11 04:46 AM
01/02/11 04:46 AM
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200 is good, i would worry if it creeps up over 200 and starts to get to 220/230 and does not come down at speeds better than 35/40mph. also timing and jetting can affect temp.

Re: how hot is too hot of an operating temp? [Re: ademon] #894166
01/02/11 11:43 AM
01/02/11 11:43 AM
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Central TX
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thanks for the info guys. I get a steady 200 on the highway, but idling in stop and go traffic it hits 230, then drops when I start moving again. I'll attribute a lot of that to not having a fan shroud at all. The 318 stayed cool without it but tue 360 seems to need it. Gotta find one.



1971 Plymouth Satellite
408/904 8 3/4 3.23 SG
Re: how hot is too hot of an operating temp? [Re: ademon] #894167
01/02/11 11:47 AM
01/02/11 11:47 AM
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Central TX
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also need to either get a new cap for my overflow tank, or pick up a universal one. One of the nipples broke off my original so coolant can go in but can't come back out to the radiator.



1971 Plymouth Satellite
408/904 8 3/4 3.23 SG
Re: how hot is too hot of an operating temp? [Re: Evil Monkey] #894168
01/02/11 11:49 AM
01/02/11 11:49 AM
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Lincoln Nebraska
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Quote:

The things you want to watch out for are:

A stady increase in temp when running down the highway. This would indicate that your cooling system is undersized or plugged up - you're not getting enough coolant flow. Or

A steady increase in temp when idleing or crusing slowly. This would indicate that there's not enough air blowing through the radiator.


good explanation


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Re: how hot is too hot of an operating temp? [Re: roe] #894169
01/02/11 12:05 PM
01/02/11 12:05 PM
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Suffolk,VA
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Is this a new build? If so they tend to run hotter for awhile. Also you can use a laser temp gun to find how accurate your gauge really is. Lastly make sure you have no air pockets in the cooling system.

Re: how hot is too hot of an operating temp? [Re: ireland383] #894170
01/02/11 12:21 PM
01/02/11 12:21 PM
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Coram, NY
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I know I don't know as much as many members here, but I just don't like 200 for our cars. I know that new cars run that hot but they are designed to run safely on the edge. EFI, knock sensors, computer spark control to retard timing, etc..

Personally, I don't want mine going over 180 if I can help it. I took my big block charger on a road trip this summer, sat in 3 hours of stop and go traffic to get a total of about 20 miles. It got to 210 in stop and go. No, it didn't puke and overheat, but I still didn't like it. I'm trying to come with some solution to get it to run cooler at idle. as soon as the car moves, even 20-30 mph, the temp drops right to 170 where my temp sensor is set (electric fans running off sensor)

Re: how hot is too hot of an operating temp? [Re: Pool Fixer] #894171
01/02/11 12:44 PM
01/02/11 12:44 PM
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Lincoln Nebraska
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Quote:

I'm trying to come with some solution to get it to run cooler at idle. as soon as the car moves, even 20-30 mph, the temp drops


the tried/true setup of a MP thermal clutch fan spaced ~2/3 into a shroud does work good and check the dia of your WP pulley and might be able to source a smaller dia one to speed up the fan/pump and pull the pump to tack on an anti cav plate on the vanes to make it more efficient. EDIT (re)read & missed that you're running electric fan(s)

Last edited by RapidRobert; 01/02/11 01:05 PM.

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Re: how hot is too hot of an operating temp? [Re: RapidRobert] #894172
01/02/11 01:19 PM
01/02/11 01:19 PM
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Coram, NY
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Quote:

Quote:

I'm trying to come with some solution to get it to run cooler at idle. as soon as the car moves, even 20-30 mph, the temp drops


the tried/true setup of a MP thermal clutch fan spaced ~2/3 into a shroud does work good and check the dia of your WP pulley and might be able to source a smaller dia one to speed up the fan/pump and pull the pump to tack on an anti cav plate on the vanes to make it more efficient. EDIT (re)read & missed that you're running electric fan(s)




yes, dual spal fans (1300cfm each) but due to total lack of room between WP pulley and the rad core(two row aluminum Fluidyne) the fans are mounted up high on the rad. bottom third of rad isn't getting air pulled through it. I think that's my problem. I don't know if I should create some sort of shroud to cover that part of the rad and leave fans where they are or maybe go with the feets mercedes fan that would cover more of the core (I am a bit short on clearance even for that though so i'd have to get creative)

I was running a flowkooler wp with the plate tacked on and I switched it out for a parts store stock replacement. There was no change in performance.. but enough of a hijack here. As much as I'd love to get my issue resolved, it's this guys thread...If you have any suggestions though, please please PM me. Thanks so much. Kevin.

Last edited by dkn1997; 01/02/11 01:20 PM.
Re: how hot is too hot of an operating temp? [Re: 1_WILD_RT] #894173
01/02/11 01:23 PM
01/02/11 01:23 PM
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Pendleton NY
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Quote:

FWIW Ford doesn't even turn on the electric fan on cars so equipped till 221 degrees..




FWIT...that ford must be a newer car...old iron was in the danger zone at 210 plus...I don't understand why anyone would run old iron motors at 230 and wait for 250......195 to 200 nis ok...I prefer to see it around 190 for My Bee and GTX...both 440 motors

Re: how hot is too hot of an operating temp? [Re: roe] #894174
01/02/11 01:27 PM
01/02/11 01:27 PM
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IL . usa
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I run a seven blade flex fan 17 in dia with stock shroud on a 26 inch
3 core stock brass type radiator .
with a 160 t-stat the eng would run to cool for school , never even got to 180 unless very warm out side . the eng has aprox 600 hp.
had to switch to 195 t stat to correct some air fuel distributon issiues and car still runs 195 on hyway will creep to 210 if sitting in trafic to long but still ok .
I have a friend with a all alumnum 850hp hemi that runs stock seven blade fan with the viscus thermo clutch and keeps cool and says that he has tried every fan out there and none can beat the factory seven blade pulls about 4000 cfm so he says . try to find electric fans that will fit on a 26 in radiator and pull like that ! very dificult !


1969 Dodge Charger 1969 Dodge Superbee
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