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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: how cool is too cool?
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Fri, 18 February 2005 05:22
 
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| dingaling wrote on Thu, 17 February 2005 23:24 |
"you also need to match your grade of oil (the hot number, ie 40, 50, 60 etc) to your operating temps.."
Can you clarify that bit of info, that's very interesting what you say there, But i'm pretty sure you don't mean to match your operating temp of say 80C to an oil raing of 80?
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oil (and most other liquids) viscosity is a function of temperature.. thats why there is a cold and hot rating on oil. higher number for h8igher operating temp, and no, don't match the numbers 
as for the opening thing, i used an LM35CZ precision temperature sensor with a pico ADC16 datalogger
it definitely begins to open very close to the rated temp, sometimes 1 or 2 deg under, and sometimes a couple over, but not more than 1 or 2...
with my fan on all the time, i had vastly changing temps.. (the thermostat is before radiator inlet, and temp sensor is just below thermostat. temp would sit at 82 for a while and slowly creep up , but then would start to increase faster.. this would take a couple of minutes.. and then temp would go down to 82 in about 3 seconds.
i attribute this to a thermostat that is sealing too well. the water was not circulating much, and so the temp reading and thermostat temp didn't rise quickly... initially, block water is stationary. temp warms up, tiny amount of water escapes past thermostat and temp appears to rise slowly, but the water in block is getting heated. then thermostat opens slightly, the hot block water starts escaping, and the thermo opens more, letting more hot water escape.. hence the faster temp rise... during this time, the water in the radiator was cold, and it gets let into the block... so eventually, when water is exiting fastest thru the thermostat, cold water is rushing in... when the cold water hits the thermostat, the temp suddnely drops, and the thermostat suddenly closes....
so long long story short, i drilled a 3mm hole in the thermostat and now the temp changes aremuch more gradual.
Cya, Stewart
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| | Subject | Poster | Date |
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how cool is too cool?
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RAV-GT4 | Thu, 17 February 2005 05:52 |
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Re: how cool is too cool?
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RobST162 | Thu, 17 February 2005 06:03 |
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Re: how cool is too cool?
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RAV-GT4 | Thu, 17 February 2005 10:43 |
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Re: how cool is too cool?
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dingaling | Thu, 17 February 2005 12:24 |
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Re: how cool is too cool?
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oldcorollas | Fri, 18 February 2005 05:22 |
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Re: how cool is too cool?
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EldarO | Thu, 17 February 2005 06:04 |
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Re: how cool is too cool?
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NAMDAMAMI | Thu, 17 February 2005 07:20 |
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Re: how cool is too cool?
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oldcorollas | Thu, 17 February 2005 07:52 |
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Re: how cool is too cool?
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CrUZsida | Thu, 17 February 2005 13:24 |
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Re: how cool is too cool?
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V8_MA61 | Thu, 17 February 2005 13:33 |
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Re: how cool is too cool?
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dingaling | Thu, 17 February 2005 14:06 |
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Re: how cool is too cool?
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V8_MA61 | Fri, 18 February 2005 00:10 |
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Re: how cool is too cool?
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river | Thu, 17 February 2005 20:36 |
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Re: how cool is too cool?
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bbaacchhyy | Thu, 17 February 2005 22:06 |
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Re: how cool is too cool?
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rob_RA40 | Thu, 17 February 2005 21:58 |
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Re: how cool is too cool?
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gianttomato | Thu, 17 February 2005 22:03 |
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Re: how cool is too cool?
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Hunty | Thu, 17 February 2005 22:41 |
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Re: how cool is too cool?
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CrUZsida | Fri, 18 February 2005 01:21 |
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Re: how cool is too cool?
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Bugman | Fri, 18 February 2005 02:11 |
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Re: how cool is too cool?
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CrUZsida | Fri, 18 February 2005 02:13 |
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Re: how cool is too cool?
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berad | Fri, 18 February 2005 02:17 |
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Re: how cool is too cool?
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Bugman | Fri, 18 February 2005 02:17 |
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Re: how cool is too cool?
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CrUZsida | Fri, 18 February 2005 02:31 |
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Re: how cool is too cool?
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SupraPete | Fri, 18 February 2005 02:54 |
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Re: how cool is too cool?
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Bugman | Fri, 18 February 2005 02:35 |
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Re: how cool is too cool?
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SupraPete | Fri, 18 February 2005 02:47 |
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Re: how cool is too cool?
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CrUZsida | Fri, 18 February 2005 02:55 |
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Re: how cool is too cool?
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SupraPete | Fri, 18 February 2005 02:57 |
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Re: how cool is too cool?
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CrUZsida | Fri, 18 February 2005 02:59 |
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Re: how cool is too cool?
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SupraPete | Fri, 18 February 2005 03:00 |
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Re: how cool is too cool?
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SupraPete | Fri, 18 February 2005 06:00 |
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Re: how cool is too cool?
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oldcorollas | Fri, 18 February 2005 06:03 |
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Re: how cool is too cool?
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river | Fri, 18 February 2005 06:52 |
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Re: how cool is too cool?
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river | Fri, 18 February 2005 08:59 |
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Re: how cool is too cool?
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Bugman | Fri, 18 February 2005 20:27 |
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Re: how cool is too cool?
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oldcorollas | Fri, 18 February 2005 23:01 |
