When You Do And Do Not Need A Thermostat
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- Опубликовано: 4 ноя 2018
- When do you need to use a thermostat, when do you not, and what are the benefits of using a restrictor for racing applications? Engine Power hosts, Mike and Pat will run through the answers.
To start, what doe s a thermostat do? When the engine is cold, the thermostat is designed to block the flow of coolant from the engine to the radiator until the coolant is up to the thermostat's temperature rating. At that point, the thermostat slowly starts to open allowing hot coolant to enter the radiator to cool off.
Most engine wear occurs when the engine is cold. So a thermostat aids in getting the engine temperature up faster to prevent cold wear. Keep in mind that changing a thermostat out to a cooler rating isn't going to make your engine run cooler but instead, the thermostat is going to be open all the time at temperature allowing a steady rise in temperature until the engine eventually overheats. The only way to fix that is a better radiator or other cooling system components.
This demonstration shows you just how a thermostat works. All you need is a propane camping stove, a pot of water, a gauge to measure temperature, and a 160-degree thermostat.
Start by lighting the burner, then put on the pot of water and place the thermostat in it. This represents a warm-up from a cold start. With the thermostat closed, it's allowing the coolant and engine to heat up. Once the water hits the thermostat's temp rating it will slowly open which will let coolant enter the radiator. After the engine is shut off and the coolant loses heat, the thermostat slowly returns to its closed position.
When the Engine Power team runs an engine on the dyno they never run a thermostat in the water neck for a specific reason. The dyno takes care of the temperature control by a thermostatically controlled switch on the bottom of the cooling tank. Running a thermostat in this situation would restrict water flow and lead to inaccurate control over the temperature. And of course, temperature control is very important.
Specific size restrictors are available to tailor to your engine's operating range and cooling system capacity. It impedes flow at a very specific rate to get the proper temperature for what your engine was designed to operate in. Any time you suspect a faulty thermostat, you can always test it by heating it in water until it reaches operating temperature.
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Авто/Мото
Thermostat delete does not make an engine overheat. But it makes the engine take a longer time to reach operational temp.
What you mean with "delete"?
@@chicogozosodecabellosedoso by deleting, i mean removing the thermostat and replacing it with a dummy cap that doesnt have a thermostat inside.
@@chicogozosodecabellosedoso or replace it with a straight pipe if it is possible.
@@khmerghost Thank you 👍
This is real simple when you do replace your thermostat used a fail safe type that when fails open completely so no damage to engine have fun
Where do they sell those at
an open thermo is not assuring a good engine,,,you engine can fail if over heated or under heated
Some Dirt bikes are water cooled and don't have a thermostat or a fan so I don't get WY you would damage your engine taking it out
Changing out to a cooler thermostat won't make your engine run cooler? Gee that's funny because I switched to a 160 from a 195 and the temp went from 195 to 160.
Do I need a thermostat in the tropics? Does hot weather provide enough heat to the engine regardless of thermostat? Does thermostat lead to engine overheating in hotter climate? When you need and not need a thermostat was not answered please!
can you use a restrictor in stock applications ? especially since auto parts store are sell crappy cheap thermostats? and what wasent mention was what colored restrictor is for what temp range ???
Thanks
Restriction in system is to increase the pressure in the block and heads to stop localized boiling usually around the exhaust valves. The radiator efficiency and airflow and of course HP being used are all factors , etc etc.
makes no sense what yor talking about...
you give more pressure your going to make it boil sooner.thast how we cook
if people knowshit about mechnics they should stip telling bullshit
Hello. What is the difference between a thermostat in the cylinder head or at the bottom of the engine?
How would a lower temperature opening cause overheating? More flow means more opportunity to cool, and racecars, though restricted, have constant flow as well?
Less heat transfer from the block to the coolant. Flowing too fast. Coolant temp will show low but the engine block will be hot
These guys are idiots and have no idea what they are talking about. I've always bought lower temp ones and my cars have ran cooler on all 5 of my turbo cars on my srt4 back in 06 I took it out completely and it ran perfect and never got hotter than 140 sitting in traffic or on the highway. What that guy said makes no sense whatsoever
@@yamslam7083 nobody measuring coolant temp anymore nowadays. Not 1 sensor is on my radiator for sure.
@@yamslam7083 ahaah waht a crap... shut up please.
@@yamslam7083 That's interesting.
You're right about heating a thermostat up in water to check and make sure it is in working order, but for $15-$20 for a new one, if you have taken the time to pull out the order one - you might as well swap it out - I mean, your eight there.
Yes, you are most likely swapping it out. But you're also checking if the thermostat is the actual problem for your cars symptoms.
$15-$20 here $15-$20 there, at the end of the year it's one month off I take off work or if I like working, it's a new apartment every now and then
In an engine used for road racing use, you spend a lot of time in the paddock and pits, then a pace lap and then all out racing and then more pit and paddock driving. Would you want to use the thermostat designed for that engine or go without one to make sure the engine never overheats?
i live in a place where it doesnt snow and the temp never gets above 90, which temp thermostat would keep it cool all the time or no thermostat?
LIKE YOUR ADVICE
This is the dumbest thing I've ever heard they wouldn't sell lower temp thermostats if they were going to eventually over heat you car. They are made so your car runs cooler. This is coming from a mam that's owned 5 turbo cars and always bought lower ones on my srt4 back in 06 I took it out completely and had no problem
I don't understand their logic with the cooler running thermostat. Water temp reached 160 f. Flows into radiator. Engine black heats up cool water, opens thermostat and repeats cycle. Why would it over heat??
Most coolant (factory) systems aren't efficient enough to return coolant to the engine less that 160 degrees. So as the outside temp goes up, or the airflow through the radiator goes down, ( stop and go, standing still ect) the temp going back into the engine, is almost the same as what came out. The temp starts to climb, and hot days makes it climb very fast, bingo overheat. It only takes 30 degrees to get you into trouble, runaway temperature control. The stat and radiator/fan ect are out of sync.
Because these guys are idiots and they don't know what they're talkin about
Never have tested a thermostat like that. Usually they fail open. I take the car for a steady cruise down the highway at 60 mph and watch the coolant temp. If it’s dropping below the thermostat temp rating, more than likely the thermostat has failed. Usually overheating issues are low coolant, no flow(bad pump), cooling fan not working or not Adequate, or head gasket failure.
Exactly not because you bought a lower temperature thermostat it supposed to make the motor run cooler these people have no idea what they're talking about. One yard took my thermostat completely out and it rained colder than it ever had
Which Pump were you referring to?
@@nickotasla3091 water pump
If you overheat by running wide open, yeah your radiator is too small. But that also means you'd have overheated faster with the right thermostat
depends on the design. In mini cooper classics for instance, thermostats help coolant to flow to cylinders 3 and 4. Without a thermostat those cylinders will overheat much faster.
for me i live in a coastal city, i dont have thermostat in my car , my car doesnt do highway runs , i only drive it in town and short periods with lots of stop and go...after 5 minutes my car always reaches working temp and stays there ..so having the risk of a blown head gasket cause of a stuck thermostat doesnt make it up for only 5 minutes that my car takes to warm up from cold start...even in winter here wich i wuldnt call winter...inside the engine is hot whatever cold outside could be here
Hey pat.. do you need another pen?
this is useless info,,i am trying to find out if my thermo is no good without having to remove it from the housing,,that is the whole point,if there is a way to find out that can possibly spare me having to do that if it's working fine,,so what should i be checking for ,a check eng light? hot or cold radiator hose? etc etc ,,my eng light has been comming on and off for many years now,,had a diagnosis and was told it was either the thermo or a gas cap
Just shake up your magic 8 ball and it will tell you...bro you have to diagnose a vehicle to see what's wrong with it... A thermostat is held in place by 2 bolts...
@@jacquelynberry2789 yes but there is a smarter way of doing things instead of working harder sometimes
Learned absolutely nothing new... 😒
Runs hotter as you sit still such as traffic
Well that's good to know, l thought that a lower degree one would cool the engine down to whatever temp T-stat you were you using lol
This is nonsense.... You're making bold oversimplified statements. The things you say, CAN be true sometimes, but not ALWAYS... You're talking like it's a 100% done deal.... it's probably closer to 50%
The more you know.🌈
Ha!, classic.....
A lot about nothing .
ytb garbage