Aq125a thermostat

do you really need one?

do you really need one?

Yes.

Yes.

"just wondering why,, thought

"just wondering why,, thought it was for heat.. would think without it the engine would run cooler?"

"There are many reasons. An en

"There are many reasons. An engine transform thermal energy (heat) into mechanical energy (power); therefore, the more thermal energy you eliminate in the exhaust, cooling water, etc, the less energy is left to be transformed into power (in other words, your fuel consumption will increase with a cooler engine) . Of course, the limit is the boiling temeprature of water, which is 212 ºF at normal atmospheric pressure but higher than that if the water is kept under pressure (this is why a "radiator cap" has a spring to keep the water pressurized up to approximately 10-15 psi). Also, matter expands when you add heat and contracts when you remove heat. Keeping the temperature as constant as possible means engine parts are contracting and expanding less. Sudden contraction or expansion can lead to fatigue cracks and seizure of parts in motion. On the other hand, you have to keep metals without reaching too high temperature (or they would fail) and the oil, if heated too much, will loose its viscosity, which will bring a decrease in oil pressure which will lead to bearing and piston failure due to metal to metal contact. Oil also breaks down and burns above certain temperatures.

Summing it up, an engine should be kept as hot as it is safe to do, the main limiting factors being the oil viscosity and the temperature the metals can take without failing.

Hope this will give you an idea of how important is to have the right thermostat for your engine."

Thank you very much... It was

Thank you very much... It was nice to have someone explain it to me....Thanks again for your help.