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Old 25-01-2010, 11:40   #1
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Most Efficient Temperature for Kubota Engine

Well I think I have solved the overheating problem with my Phosaor engine ..... maybe even over solved it! I installed a small second heat exchanger in line with the original heat exchanger. I can now run the engine at full throttle and and the engine will heat up only to about 155 or 160 degrees F. The Phasor came with a 150 degree F (don't know if they did that because the knew the engine was going to overheat or not). I have heard that a small diesel engine is most efficient when operated at about 190 degrees F (don't know exactly where I heard that). If in fact that is true, wouldn't I be better off to replace the 150 degree F with a 180(?) degree F thermostat?

Any thoughts would be appreciated.

Bill A. S/V Mobetah

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Old 25-01-2010, 13:16   #2
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Its a compromise. The hotter an engine runs, the greater its efficiency. On the other hand, running an engine too hot thins the oil and of course has the potential of boiling the coolant.

Check the manufacturer to see which temperature thermostat they recommend for their engine. There is no need to guess.
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Old 25-01-2010, 16:50   #3
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with closed cooling you should run at 180*F
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