ENGINE GETS RED HOT

[irvingj]

Say what you want, believe what you will.... after having studied aerodynamics for a number of years, I can tell you there IS such a thing as laminar flow --with any fluid, be it gas or liquid-- and "insulating" ability. Mace Canute has it right on that point.

(Ever wonder why a convection oven cooks faster?)

 

[ctgoldwing]

Removing a t-stat causing overheating is not nonsense. What happens is a t-stat restricts water flow, in the block this allows for faster warmup's and the stat opens and closes slightly to regulate water flow as needed to maintain set temprature.
When a stat is removed, the flow restriction is removed also, Thus coolant can flow through the radiator too fast, without enough time to cool down adaquatly.
One has to remember, the restricted water flow i mentoned above, works two ways, it holds water in the block longer, as well as restricting flow out of the radiator so theres enough time for it to cool properly.

As the water makes more passes will the smaller incremental reductions in temperature equal a large one from a slow pass?

Do the faster passes with less temperature differential mean the engine temperature is more consistent?

This is one of those funny internet threads
There may be many reasons for running a thermostat in the engine but causing overheating by removing it isn't one of them.

Yes with the stat removed there will be more water flow through the entire system (motor & radiator). Moving faster through the motor will result in a smaller increase (rise) in temperature in the coolant. The radiator, on the other hand, will exchange heat based on the temperature difference between the water in it and the air. As the temperature rises the radiator will exchange more & more heat. At some point there will be an equilibrium point (probably lower than the thermostat's original setting, again depending on air temp).

 

[CharlieS]

There may be many reasons for running a thermostat in the engine but causing overheating by removing it isn't one of them.

temp).

If its not possible, then how does one explain that it can happen? My first experience with tstat removal/overheating was on a "C" gleaner. The stat stuck closed, we removed it in an attempt to get through the day without running 30 miles to town for parts. Less than one round in the field and the cooling system was steaming and heat guage pegged. I could cite a few other cases i've seen similar happen also.
Now, its not saying this will happen in every case, and there's alot of variables, ambient temperture, capacity of the given cooling system, airflow through the radiator, to name a few. In cold weather its just as likely an engine wont warm up properly, under the right conditions.
To say it cant happen though? Just because someone has never witnessed the occurance, doesnt mean its not possible.

 

[ctgoldwing]

If its not possible, then how does one explain that it can happen? My first experience with tstat removal/overheating was on a "C" gleaner. The stat stuck closed, we removed it in an attempt to get through the day without running 30 miles to town for parts. Less than one round in the field and the cooling system was steaming and heat guage pegged. I could cite a few other cases i've seen similar happen also.
Now, its not saying this will happen in every case, and there's alot of variables, ambient temperture, capacity of the given cooling system, airflow through the radiator, to name a few. In cold weather its just as likely an engine wont warm up properly, under the right conditions.
To say it cant happen though? Just because someone has never witnessed the occurance, doesnt mean its not possible.

Is it possible, when removing the thermostat, the system became air bound???

 

[wvpolekat]

Is it possible, when removing the thermostat, the system became air bound???

Is it possible, that your theory isn't 100% bulletproof and removing a thermostat can cause overheating?

 

[Eagleview]

I know it wont help but here goes anyway .

 

[doall]

pressure caps really raise the boiling temp 3 degrees f. for every lb of pressure. so a 15 lb. cap would actually raise boiling point to 257 degrees.

Shouldn't try to start another string but couldn't help it.:laughing:

 

[Mace Canute]

Here you go...from Grape Ape Racing. Under "Technical Articles"..."Cooling Systems"..."Coolant Flow" on page 4 of 7. The article is a good read and very informative.

This is from people that successfully campaigned a 1200 horsepower pump gas small-block street car.

"Different coolants require different minimum
flow rates, but contrary to popular belief, you cannot
make the coolant flow too fast. This rumor was started
because people removed the thermostat to gain flow,
because they had an over heating problem, and it only
aggravated the problem. The real reason they ran into
problems is that removing the thermostat also removes
the restriction that builds pressure in the engine, so they
gained flow, but reduced the boiling point of the coolant
in the block.
Running a higher flow thermostat and a higher
volume pump to maintain pressure, will give no such
problems. If you think about it, making the coolant flow
twice as fast will also make it flow though the engine
twice as often, so there will be more even temperature
across the engine.
There has been, and still is, the rumor that of
the coolant flows too fast, it will not have time to pick up
heat. That is nonsense, as long as there is coolant
contact a surface, the rate of heat transfer will be the
same. Coolant that flows twice as fast also flows through
the block twice as often."

And if you think slow flowing coolant is a good thing, read what they say about electric water pumps...

"Many aftermarket companies offer electric
water pumps. Many of these pumps do not flow well or
build sufficient pressure in the block. They are only good
for limited drag racing use, and when used they need a
high pressure cap to help prevent steam pockets. If you
are considering an electric pump, don't settle for
anything that flows less than 35-40 gallons per hour and
that may not be enough. Many of these pumps flow less
than 20gph and cannot keep up with the demands of
street driving."

 

[Eagleview]

:mur:

 

[irvingj]

":mur:"....

..."Because it feels so good when I stop!"