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Old 07-02-2013, 05:41 AM   #21
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Originally Posted by Wxx3 View Post
Oh I forgot

the whole issue of standard deviation and what that raelly means in the manufacturing process
Not to mention the hysteresis loop - you must allow for the hysteresis loop....

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Old 07-07-2013, 11:33 AM   #22
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A couple of observations, one is the temp sensor isn't all that accurate in some cases. I use an infrared thermometer that I shoot at the output of the heat exchanger. It generally reads about 170F while the temperature gauge reads 182 or so. I have looked at other portions of the block and cooling system and the temps are consistent. The second observation is as rpm increases so does the flow rate of cooling water. So in addition to the thermostat allowing more water through more water is being pumped through the system. Some outboards actually use a spring loaded valve to control cooling at high rpm as the increased water pressure opens the valve allowing more water through.


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Old 07-07-2013, 12:43 PM   #23
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Don't forget to consult your "book" for proper op temps as internet musings can be erroneous dependent upon year and engine mfr. On an idle comment basis, there are some engines that have more than one thermostat. A point to be remembered too is oil temperature best be in the 175- 180 F (or higher) range to keep the oil from becoming fuel (aka volatiles) and water contaminated.

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