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onargaroberts
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Will a four cycle, internal combustion engine have greater thermal efficiency with a relatively cool jacket water temperature, say 160 degrees F, or a relatively hot water jacket temperature, say 190 degrees F? These specific numbers are only important in as much as they are commonly available thermostats settings.Does the greater temperature difference between hot combustion gasses and the relatively cooler cylinder wall of a system controlled by a 160 degree thermostat drive more heat energy into the cooling system and cause lower thermal efficiency than a system controlled by a 190 degree thermostat? Is any difference likely measureable with commonly available tools and processes.This question assumes that that cooling system has sufficient capacity for the application and at the time being considered, the system temperature is controlled by the thermostat.
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