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Message: <blockquote data-quote="astroboy" data-source="post: 375965" data-attributes="member: 4527">No matter what combustion temperature the engine designer wish to run, they are always limited to the boiling point of the pressurized ethylene glycol-water mix coolant.As we all know H2O boiling point is 100C and with combustion chamber temperature running at above 500C, H2O can't cope with those temperature and will start to boil pretty fast and once they boil, they will vaporise and vanish themselves from the cooling system, which is not a good thing to the engine.Apart from serving as a lubricant, anti freeze and anti rust, the ethylene glycol raise the coolant boiling point, the same with the pressurized cooling system, so that our coolant will not boil and vaporise at above 100C but by how many degree more?Standard water temperature gauge available in the market max out at 120C, so your thermostat better open way before that and I would think that for performance engine, thermostat better open quicker.<img src="http://www.stackltd.com/analog_gauges_web/ST3307.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />Here's another one which tells u what is the blue zone and red zone.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /><img src="http://ensautoservice.com/images/Water_Temperature_Gauge__with_Sender_.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />A friend's Lotus Elise has overheating problem because wrong thermostat was used. The rear engine Elise radiator is actually mounted to the front section of the car, if thermostat opens at 93C, by the time the water reach the radiator, cool down and return to the engine, the engine temperature has already blown over the roof! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek!    :eek:" loading="lazy" data-shortname=":eek:" /> Took them very long to trouble shoot.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /></blockquote>

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