What is this?
- Thread starter ks68
- Start date
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life2short
New Member
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- Surrey / London
Worrying!
life2short
New Member
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- 131
- Location
- Surrey / London
*Any liquid-cooled car engine has a small device called the thermostat that sits between the engine and the radiator. The thermostat in most cars is about 2 inches (5 cm) in diameter. Its job is to block the flow of coolant to the radiator until the engine has warmed up. When the engine is cold, no coolant flows through the engine. Once the engine reaches its operating temperature (generally about 200 degrees F, 95 degrees C), the thermostat opens. By letting the engine warm up as quickly as possible, the thermostat reduces engine wear, deposits and emissions.
If you ever have the chance to test one, a thermostat is an amazing thing to watch because what they do seems impossible. You can put one in a pot of boiling water on the stove. As it heats up, its valve opens about an inch, apparently by magic! If you'd like to try this yourself, go to a car parts store and buy one for a couple of bucks.
The secret of the thermostat lies in the small cylinder located on the engine-side of the device. This cylinder is filled with a wax that begins to melt at perhaps 180 degrees F (different thermostats open at different temperatures, but 180 F/82 C is a common temperature). A rod connected to the valve presses into this wax. When the wax melts, it expands significantly and pushes the rod out of the cylinder, opening the valve. If you have read How Thermometers Work and done the experiment with the bottle and the straw, you have seen the same process in action. The wax happens to expand a good bit more because it is changing from a solid to a liquid in addition to expanding from the heat.
If you ever have the chance to test one, a thermostat is an amazing thing to watch because what they do seems impossible. You can put one in a pot of boiling water on the stove. As it heats up, its valve opens about an inch, apparently by magic! If you'd like to try this yourself, go to a car parts store and buy one for a couple of bucks.
The secret of the thermostat lies in the small cylinder located on the engine-side of the device. This cylinder is filled with a wax that begins to melt at perhaps 180 degrees F (different thermostats open at different temperatures, but 180 F/82 C is a common temperature). A rod connected to the valve presses into this wax. When the wax melts, it expands significantly and pushes the rod out of the cylinder, opening the valve. If you have read How Thermometers Work and done the experiment with the bottle and the straw, you have seen the same process in action. The wax happens to expand a good bit more because it is changing from a solid to a liquid in addition to expanding from the heat.
Station House
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As 'Life Probably Dead by Now' says, it's a thermostat for the cooling system
Soloby Rob
Banned
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Not true, if the water pump, in this case, spins constantly, the coolant is pumped around the engine but not through the radiator
jamesmartin
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you tell that to ricc he dont believe meNot true, if the water pump, in this case, spins constantly, the the coolant is pumped around the engine but not through the radiator
Vagrent
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Hi
Was cleaning out the 110 I just got and came across this,
What is it?
Sorry for daft questions as I am totally new to car mechanics
Tx
Have you seen batterys not included?
you tell that to ricc he dont believe me
What's not to believe?
Ask him what the water pump by-pass hose is for :rofl:
crashbox
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You are all wrong. Its Zebedee's feet from the Magic Roundabout..
....of course it is :doh:
