cooling question
07-04-2003, 02:47 PM
#16
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This is the second time that I have seen these figures, and I am still puzzled that the lower radiator hose is shown as being hotter than the upper. I don't understand that.
07-04-2003, 03:21 PM
#17
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I still have yet to lose my "Worry wart" feeling, I recently had my radiator fixed. I noticed the redline is 10-20 degrees lower than most. Is the Alusil more sensitive to overheating?
07-04-2003, 05:06 PM
#18
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Hi Wally,
I was puzzled too initially but it is consistantly so.
I believe that it has to do with the heat "sink" working - with the thermostat closed/light cycling - certain other German vehicles are the same too. Where the true volumn of coolant activity is within the heads/block until a "sweet point" is reached. Not like a normal cooling system at all
If this is so it raises a question about the use of 75C thermostats I suppose
The measurements are accurate and I would like somebody else to replicate my tests to confirm
I measure about 1" up the bottom hose and 1" from the radiator on the top hose
My BMW has what we call a "normal" coolant flow system - hot top/cool bottom hose. My '01 VW Golf ( and other VWs I/ve owned ) operate similarly to the 928
I would appreciate some other testing too - my next "Oil Condition Report" ( No 3 ) is due this month and I will publish the up-to-date temperature figures then too. Of course it is our winter here now
As you know Wally and you are indeed more experienced here that I, the 928's cooling system is very complex and of course is air flow, coolant and oil based in a mattrix of interdependant activities. Boiling is virtually unheard of here, and they do not seem to overheat unless a real problem exists
Regards
I was puzzled too initially but it is consistantly so.
I believe that it has to do with the heat "sink" working - with the thermostat closed/light cycling - certain other German vehicles are the same too. Where the true volumn of coolant activity is within the heads/block until a "sweet point" is reached. Not like a normal cooling system at all
If this is so it raises a question about the use of 75C thermostats I suppose
The measurements are accurate and I would like somebody else to replicate my tests to confirm
I measure about 1" up the bottom hose and 1" from the radiator on the top hose
My BMW has what we call a "normal" coolant flow system - hot top/cool bottom hose. My '01 VW Golf ( and other VWs I/ve owned ) operate similarly to the 928
I would appreciate some other testing too - my next "Oil Condition Report" ( No 3 ) is due this month and I will publish the up-to-date temperature figures then too. Of course it is our winter here now
As you know Wally and you are indeed more experienced here that I, the 928's cooling system is very complex and of course is air flow, coolant and oil based in a mattrix of interdependant activities. Boiling is virtually unheard of here, and they do not seem to overheat unless a real problem exists
Regards
07-05-2003, 12:43 PM
#19
Burning Brakes
According to my GT's Owner's Manual (page 41) the first (considered Priority II) Engine Temp. "too High" warning comes on at 246F./118C. The second (considered Priority I) Engine Temp. "Too High" warning comes on at over 250F./120C.
I don't know about your threshold level for worrying, but atemp gauge reading of 210F. is well below my threshold level for concern. Clearly, YMMV. Perhaps you should consider changing your paradigm before you give yourself a stroke. :^(
I don't know about your threshold level for worrying, but atemp gauge reading of 210F. is well below my threshold level for concern. Clearly, YMMV. Perhaps you should consider changing your paradigm before you give yourself a stroke. :^(
