[glamis_dave]

hey now.got a friend building a mustang stroker motor,cant rember hoe we got on the cooling subject,but we are divided on thermstats and cooling...i maintain that without a thermstat,and running it hard you will over heat,reason being is that the coolant doesent have sufficent time to be in the radiator to cool down,he thinks more air means more cooling,anybody care to chime in with a link that would prove one of us right.....along with this most people will argue with me when i say you can die from hypothermia in 90 degree water,but it's still true...

 

[444-4D]

i maintain that without a thermstat,and running it hard you will over heat,reason being is that the coolant doesent have sufficent time to be in the radiator to cool down,

You are wrong.

 

[thehammer69]

You are wrong.

:stupid:

Hammer

 

[THEDIESELMAN]

I have ran a SBC without a t-stat and it never even got hot so I would have to say it will stay cooler without a t-stat.

 

[Diezel Dawg]

if u run a vehicle without a tstat in winter, it will never get warm enough to warm the vehicle up. thats pretty much it.

 

[glamis_dave]

my real world experence says something different,both times thermstat failed in road,2 different vehicles,both times ran it mild 55-75 mph no problems,both times thought well no problems lets run it like i like to..80-90mph 3 min later overheating,,slow down and it cooled off....hhhmmmmm

 

[THEDIESELMAN]

When a t-stat fails it usually stays closed so it heats everything up.

 

[69W900A]

I've run most of my engines with no T-stat, but you need something to control coolant flow. Especially if it's a race engine that will see high RPM and high coolant flow situations. I just used washers that have the correct OD to fit in the housing and then changed the ID until I get the desired flow.

If the engine is used in a driver the only thing you will notice is the coolant will take a bit longer to warm up, but after that the temps will be much more constant. You should have some device to control coolant flow, whether static or dynamic, in the system.

 

[glamis_dave]

are you guys really thinking ???? with no thermastat..running it hard,hard it will overheat.....

 

[444-4D]

are you guys really thinking ???? with no thermastat..running it hard,hard it will overheat.....

A lot of things will cause an engine to overheat. Coolant flowing too fast thru the radiator isn't one of them. Wasn't that the original question?

 

[THEDIESELMAN]

are you guys really thinking ???? with no thermastat..running it hard,hard it will overheat.....

If you run anything hard enough it will overheat is that what you want to hear because your not really listening to what anyone is telling you.

 

[gregrob]

If you run anything hard enough it will overheat is that what you want to hear because your not really listening to what anyone is telling you.

I haven't heard anyone give him an explanation so far.

 

[THEDIESELMAN]

Well if you don't have a t-stat the coolant is not in the block long enough to get hot and the coolant doesn't have to get to a certain temp for it to flow threw the radiator to cool it down so it will stay cooler because it just doesn't have time to get really hot.

 

[glamis_dave]

Well if you don't have a t-stat the coolant is not in the block long enough to get hot and the coolant doesn't have to get to a certain temp for it to flow threw the radiator to cool it down so it will stay cooler because it just doesn't have time to get really hot.

my point exactly,but that situstion reverses,whey you run it hard,it gets hot ant is moveing through the radiator so fast it cant scrub the heat away,but really it's kinda a pointless thread,the ansers arnt ready available,to anser my friend,so i'll just concede....but i still maintain you can die of hypothermia in 90 degree water...........

 

[THEDIESELMAN]

I've run most of my engines with no T-stat, but you need something to control coolant flow. Especially if it's a race engine that will see high RPM and high coolant flow situations. I just used washers that have the correct OD to fit in the housing and then changed the ID until I get the desired flow.

If the engine is used in a driver the only thing you will notice is the coolant will take a bit longer to warm up, but after that the temps will be much more constant. You should have some device to control coolant flow, whether static or dynamic, in the system.

my point exactly,but that situstion reverses,whey you run it hard,it gets hot ant is moveing through the radiator so fast it cant scrub the heat away,but really it's kinda a pointless thread,the ansers arnt ready available,to anser my friend,so i'll just concede....but i still maintain you can die of hypothermia in 90 degree water...........

Read the post above from 69W900A and that is how you get it so cool you have to control the flow. So tell your friend that if you run no t-stat and control the flow of the coolant you will have a cooler runnig car even when running it hard.

 

[racehauler]

My experience with thermostats, restrictors, and so on in racing applications (high RPM circle track engines) is this:

I have run engines with a thermostat (160* high flow Mr. Gasket) and have no cooling issues. I have run the same engine, water pump and everyting with no thermostat or restrictor in the system with no cooling issues. I have never run a restrictor of any sort but I would assume the results will be the same as running a thermostat except it would warm up slow like not running a thermostat.

For the explanation of why in some cases adding a restrictor (when there was no thermostat in the system) is that the restrictor does just as it is named, it restricts coolant flow. When you restrict coolant flow you add pressure between the water pump and restrictor (this pressure would be added on top of the pressure that you radiator cap holds on the system) When you increase pressure water's boiling point rises, thus reducing the amount of steam that can be created in the engine.

The perfectly designed cooling system would have the correct size of restrictor in the water outlet to get enough pressure in the engine and enough coolant flow to properly cool the engine.

The theory of water moving too fastly through the radiator to properly cool is totaly false.


Another suggestion: If you are having cooling problems in racing applications you need to make sure you have a properly balanced water pump. This applies to water pumps that feed water into the block in 2 places (like most popular hi-perf gas engines have)
Edelbrock Victor Series water pumps are a very good pump. They flow pleanty of water and are extremely well ballanced.