Is there anything we can buy that would tell us oil temp and intake air temp?.?The blue light is to advise of low coolant temp, is that what you mean? (i.e. it's not advising on oil temp?)
An Ultragauge or an Aeroforce Interceptor will be able to tell you coolant temp and IAT, but unfortunately not oil temp.Is there anything we can buy that would tell us oil temp and intake air temp?.?The blue light is to advise of low coolant temp, is that what you mean? (i.e. it's not advising on oil temp?)
The oil is warmed up and at operating temperature before the coolant is. The only concern over oil at startup is whether it has gotten into all the bearings. It's temperature is of no real concern. Oil temperature concerns are after the engine has been running a long time under stress. Overheated oil can be an issue.doesnt mean the oil is fully warmed up...Right. So we should still take it a little easy,
Until we know the oil is fully flowing correctly...
Right???
Cyberbill
Incorrect. The thermal conductivity (W/m K) of water (and ethylene glycol) is higher than oil, which means water can absorb (and release) heat a lot faster than oil; that, and in an automotive application it's thermostatically controlled.The oil is warmed up and at operating temperature before the coolant is...
Thermal conductivity is not the relevant property. Heat capacity is. It takes much more heat to raise the temperature of water than a similar amount of oil. There's also twice as much water as oil, so the water in general heats up much more slowly.Incorrect. The thermal conductivity (W/m K) of water (and ethylene glycol) is higher than oil, which means water can absorb (and release) heat a lot faster than oil; that, and in an automotive application it's thermostatically controlled.
The general consensus is that it takes engine oil approximately 20 minutes to reach operating temperature.
Thermal conductivity is not the relevant property. Heat capacity is. It takes much more heat to raise the temperature of water than a similar amount of oil. There's also twice as much water as oil, so the water in general heats up much more slowly.
It's all in thermal equilibrium since they're circulating within close proximity in the same engine. Therefore, the oil temperature is held back by the more slowly heating water. By the time the water is hot, the oil is plenty hot.
Heat capacity is only relevant insofar as to explain why water (even in an ethyl glycol mixture) is a better coolant than mineral oil...Thermal conductivity is not the relevant property. Heat capacity is.
That is true, all else being equal (which is to say, in isolation).It takes much more heat to raise the temperature of water than a similar amount of oil.
You've omitted the fact that a decent portion of that "twice as much water" is held within the radiator and associated hoses, the flow into which is thermostatically controlled.There's also twice as much water as oil, so the water in general heats up much more slowly.
A cursory search confirms most disagree...It's all in thermal equilibrium since they're circulating within close proximity in the same engine. Therefore, the oil temperature is held back by the more slowly heating water. By the time the water is hot, the oil is plenty hot.
OK, I stand corrected on the temperature differences. Nonetheless, the thermal conductivity is irrelevant. The main difference seems to be that the coolant is thermostatted, while the oil isn't.Heat capacity is only relevant insofar as to explain why water (even in an ethyl glycol mixture) is a better coolant than mineral oil...
That is true, all else being equal (which is to say, in isolation).
You've omitted the fact that a decent portion of that "twice as much water" is held within the radiator and associated hoses, the flow into which is thermostatically controlled.
A cursory search confirms most disagree...
http://www.i-club.com/forums/afterm...ines-62/what-heats-up-first-oil-coolant-1499/
https://bobistheoilguy.com/forums/ubbthreads.php/topics/2573049/1
https://forum.miata.net/vb/archive/index.php/t-103493.html
Tom is correct. The oil does not need to be hot. That is why a hybrid car can switch from electric drive to gasoline drive instantaneously without harm to the engine, even on really cold days.Thermal conductivity is not the relevant property.
Looking at this interesting thread from a layman's perspective, I guess that an engine's " full operating temp" measured in the coolant is one sign of it's efficient operation. By that time the cylinders have warmed enough to promote combustion and oil has thinned sufficiently to ease friction. When the blue light is on this efficiency is absent.The engine itself is the most important temperature consideration, moving parts and their interaction with stationary parts. The best measure of that temperature is the coolant, assuming that measurement is taken from the engine block and the thermostat is working properly.
So I gues I'll keep it under 3,000 rpm until 15 to 20 minutes, and make sure I put a 1/2 quart of Lucus Full Synthetic oil treatment with each oil change, to be safe,..the conversation made me think of the monty python skit
https://www.youtube.com/watch?v=w8Rn_f75UHs
To be extra safe, keep it in the garage - heated - until outside temperature is 71.2 with a relative humidity of 56.666 (recurring). Then only drive it between the hours of 7 and 8pm...So I gues I'll keep it under 3,000 rpm until 15 to 20 minutes, and make sure I put a 1/2 quart of Lucus Full Synthetic oil treatment with each oil change, to be safe,..
Cyberbill
I see you've conveniently changed the topic; having both initally stated the oil came up to operating temperature before the coolant. Tom has accepted that, with the proviso that despite being incorrect it really doesn't matter.Tom is correct. The oil does not need to be hot. That is why a hybrid car can switch from electric drive to gasoline drive instantaneously without harm to the engine, even on really cold days.
Those of you who think the oil temperature needs to warmed up before heading out to work should let your engines idle in the garage for twenty minutes each morning.
For those not alert enough to get it, this is sarcasm.Tom is correct. The oil does not need to be hot. That is why a hybrid car can switch from electric drive to gasoline drive instantaneously without harm to the engine, even on really cold days.
Those of you who think the oil temperature needs to warmed up before heading out to work should let your engines idle in the garage for twenty minutes each morning.