Thanks to all!!!!!!!!!!!!!!!!!!!!!!!!!!

mark777 · Jul 26, 2005

Dick,

Your correct about water flow....many Winston cup and Bush National cars (NASCAR) run with restrictor washers in the thermostat housing instead of a thermostat. Between "5/8 and "3/4 holes in the plate to restrict flow - slow down the water flow and provide time for the heads, block and radiator to cool. The faster the flow of coolant, the less time for heat exchange to occur.

This is not a new science as people have been doing it for years. As far as the above problem I would concentrate on hoses that may collapse, trash and rust in the block, waterpump impeller wobble... or anything that is restricting the flow of coolant. It would seem any temp gauge that's at 3/4 is too hot.

Mark

pruntyc · Jul 26, 2005

Yes Mark that is another good idea about the hoses collapsing. I've had that happen, they will go just as flat as a pancake, if they have gotten kind of soft. Of course then the water won't flow at all either, so that could be happening also. Its really hard to tell, when one isn't there to see.

scrinch · Jul 26, 2005

"The faster the flow of coolant, the less time for heat exchange to occur."

I believe that an engine might run hotter without a thermostat, but not because there is less time for heat exchange to occur. If an engine runs for a half hour, isn't coolant passing through the head(s), block and radiator for 30 minutes regardless of the presence of a thermostat? To put it another way, isn't there cooling water in the head all the time that the engine is running, so heat exchange is occurring all the time, regardless of water speed? My guess is that a restriction in the thermostat housing causes the water in the block/head to be under slightly higher pressure and therefore minimizes development of a steam layer at hot spots along the wall of the water jacket. Without the steam layer the water makes better contact with the metal and heat exchange is more efficient, and therefore the engine runs cooler.

Maybe this is the right reason and maybe it isn't, but 30 minutes of water contact is still a half hour. /forums/images/graemlins/smirk.gif

thegreatrandini · Jul 26, 2005

What the crud are u talking about?
Yes, closed: no water can get through. Open: water gets through.
What is to think about?
His thermostat being stuck open is not causing his tractor to overheat period. Might be stuck closed but not open.

pruntyc · Jul 26, 2005

I sure wish you were right. For is you were, notice I said were. Then my YM 1700 that doesn't have a water pump would run just as cool as one with a water pump. But it just don't happen. This has been figured out a long time ago, so why do you think you have a new answer, better than the people that have been working with it for many years. Some times by slowing something up it can pick up more, is that hard to understand?? And again its like the fan cools the radiator because more air is going through it, air is going through it anyway, but in this case more air cools it more. Now I didn't figure that out, it has already been done, and I accept that, and it works.

pruntyc · Jul 26, 2005

Yes in case you havn't noticed this forum is not to find fault, just read what I said. He said he ran a water hose into the tractor hose, and the water flowed right in. I said if it were stuck closed the water would not flow into it, as it would stop it. If it were stuck open then the water would flow through it, as it wouldn't be stoped by the thermotat. That is what I said you needed to think about. /forums/images/graemlins/smile.gif

thegreatrandini · Jul 26, 2005

Yes, they do that but not why you said. They don't want them running to cold. But they don't want to risk all on a thermostat either. I just disagree with the science. I can see where units with water pumps may need a thermostat to get the water to circulate but we are not talking about water moving to fast to pick up the heat. I am calling that junk science...Good luck proving me wrong!!!

DavesTractor · Jul 26, 2005

</font><font color="blue" class="small">( At 3/4 its still hot and the fluid is boiling in the overflow. )</font>

A bad headgasket will cause bubbles in the overflow.

thegreatrandini · Jul 26, 2005

Yea, I read that but I am not there to see if water is really going through the block or not. Also some thermostats never close completley....I don't mean to give you a hard time I just don't buy the water moving to fast science.