Types Of Thermostats Used In A Water Cooled Engine At Ernest Almaraz Blog Engines. 454 crusaders. the general rule in a raw water cooled motor running in salt water is you should run the 140 145* thermostat. with closed cooling the thermostat is usually the 165*. the reason for the lower temp in the raw water cooled motor is to prevent the salt from crystallizing in the water passages, manifolds and risers which it. Many people have different thoughts re: thermostats. keep in mind that salt water starts to crystalize at about 180*. in a raw water cooled motor running a 160 170 degree thermostat is flirting with that way too close. most marine mechanics will tell you run a 140 145 degree thermostat in a raw water cooled motor when in salt water.
Types Of Thermostats Used In A Water Cooled Engine At Ernest Almaraz Blog Re: thermostat yes no with raw water cooling. if the engine was designed to run with a thermostat, it should have the appropriate thermostat fitted. the principle is very simple – a raw water cooled engine has to maintain a fairly cool running temperature to avoid heat precipitation of salts from sea water. but running any engine dead cold is. As a general rule; whether raw water cooled or fitted with a closed cooling system, river or lake water boats should run at 160 180 degrees. raw water cooled engines operating in brackish or salt water should not exceed 145 degrees due to salt chrystalization that occurs at near 143 degrees. engines fitted with a closed cooling system. 195 degree thermostats… all of the naturally aspirated high performance engines which i have run on the dyno, make more power at 220f than they do at 180f… the forced induction engines may start to see some benefits at 180 vs 220… but the problem with 220 is the fragility of the water based cooling system which was just barely addressed. Stuck closed: one common failure mode is when the thermostat becomes stuck in the closed position, preventing coolant from flowing to the radiator. this can lead to overheating and potential engine damage. stuck open: conversely, if the thermostat gets stuck in the open position, the engine may not reach its optimal operating temperature.
Types Of Thermostats Used In A Water Cooled Engine At Ernest Almaraz Blog 195 degree thermostats… all of the naturally aspirated high performance engines which i have run on the dyno, make more power at 220f than they do at 180f… the forced induction engines may start to see some benefits at 180 vs 220… but the problem with 220 is the fragility of the water based cooling system which was just barely addressed. Stuck closed: one common failure mode is when the thermostat becomes stuck in the closed position, preventing coolant from flowing to the radiator. this can lead to overheating and potential engine damage. stuck open: conversely, if the thermostat gets stuck in the open position, the engine may not reach its optimal operating temperature. Engine thermostats play a crucial role in regulating the temperature of the coolant and ensuring optimal engine performance. comprising various components such as springs, hoses, thermostat valves, and temperature sensing bodies, thermostats work by automatically adjusting the flow of water to the radiator based on coolant temperature. Messages. 1,584. oct 18, 2010. #3. re: raw water cooled mercruiser moored in salt water. it's my understanding that converting to closed cooling is most effective when it's done with a new (or almost new) engine. your block will rust with any raw cooling but there's lots of thickness.
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