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Message: Why would the guages be incorrect?
Changed By: Bruce In Philly (2000 S Boxster, now '09 C2S)
Change Date: March 31, 2015 11:11PM
Why would the guages be incorrect?
Change Date: March 31, 2015 11:11PM
Why would the guages be incorrect?
[quote=MarcW]
Just a word of caution. While coolant and oil temperatures are at nominal operating temperature not all oil is warmed up (and maybe not all the coolant either.) There can be some oil in the sump that believe it or not is really not in circulation and still relatively cold. A large increase in engine RPMs will of course result in a big demand for oil. At this point the oil off to one side of the oil pump intake will get drawn in and this is much colder oil. Granted there is not much of it.
[/quote]
You may have hit on why there is a lag in the oil gauge.... there may not be. If they are pulling the temps from, say the sump or at the pump where it just came from the sump where hot return and the cold pool are mixed, then the oil will read cooler than the water..... there is your lag. I am assuming, I think correctly, that water turnover is faster than oil turnover.
Regarding the coolant... many years ago I ran the engine in my Buick with the radiator cap off and I was amazed at the amount of swirling going on. That water pumped moved some volume. If all cars move water at that rate, there would be consistent temps throughout the coolant volume.
Another variable is how many places does Porsche track a fluid's temps and what do I tick off in the Durametric tool to see them? The tool now has about 4-5 different line items that say "Oil Temperature" but only one will provide values. The sensor feeding the gauge may not be the sensor I am reporting out here. The Durametric tool has virtually no documentation on what the tracking buckets actually are or where the senders are located.
It just doesn't make sense to me that Porsche would go through the expense of creating a laggy oil temp gauge just to mislead us. If the rest of the engine or oil must warm up, then fine, state the OK oil temp in the manual or put a green line directly on the dial. Or, like some manufactures do (BMW so I've been told), limit your RPMs until OK temp is reached. Purposly misleading us is a bot odd...... I've read that there are folks who believe this. Jake Raby noted on more than once that Porsche displays the temps that "they want you to see". Not that I don't believe Jake, but I just don't understand why a maker would purposely dick with gauge readings. I don't see why it would matter.
Peace
Bruce in Philly
Just a word of caution. While coolant and oil temperatures are at nominal operating temperature not all oil is warmed up (and maybe not all the coolant either.) There can be some oil in the sump that believe it or not is really not in circulation and still relatively cold. A large increase in engine RPMs will of course result in a big demand for oil. At this point the oil off to one side of the oil pump intake will get drawn in and this is much colder oil. Granted there is not much of it.
[/quote]
You may have hit on why there is a lag in the oil gauge.... there may not be. If they are pulling the temps from, say the sump or at the pump where it just came from the sump where hot return and the cold pool are mixed, then the oil will read cooler than the water..... there is your lag. I am assuming, I think correctly, that water turnover is faster than oil turnover.
Regarding the coolant... many years ago I ran the engine in my Buick with the radiator cap off and I was amazed at the amount of swirling going on. That water pumped moved some volume. If all cars move water at that rate, there would be consistent temps throughout the coolant volume.
Another variable is how many places does Porsche track a fluid's temps and what do I tick off in the Durametric tool to see them? The tool now has about 4-5 different line items that say "Oil Temperature" but only one will provide values. The sensor feeding the gauge may not be the sensor I am reporting out here. The Durametric tool has virtually no documentation on what the tracking buckets actually are or where the senders are located.
It just doesn't make sense to me that Porsche would go through the expense of creating a laggy oil temp gauge just to mislead us. If the rest of the engine or oil must warm up, then fine, state the OK oil temp in the manual or put a green line directly on the dial. Or, like some manufactures do (BMW so I've been told), limit your RPMs until OK temp is reached. Purposly misleading us is a bot odd...... I've read that there are folks who believe this. Jake Raby noted on more than once that Porsche displays the temps that "they want you to see". Not that I don't believe Jake, but I just don't understand why a maker would purposely dick with gauge readings. I don't see why it would matter.
Peace
Bruce in Philly
Changed By: Bruce In Philly (2000 S Boxster, now '09 C2S)
Change Date: March 31, 2015 11:01PM
Why would the guages be incorrect?
Change Date: March 31, 2015 11:01PM
Why would the guages be incorrect?
[quote=MarcW]
Just a word of caution. While coolant and oil temperatures are at nominal operating temperature not all oil is warmed up (and maybe not all the coolant either.) There can be some oil in the sump that believe it or not is really not in circulation and still relatively cold. A large increase in engine RPMs will of course result in a big demand for oil. At this point the oil off to one side of the oil pump intake will get drawn in and this is much colder oil. Granted there is not much of it.
[/quote]
You may have hit on why there is a lag in the oil gauge.... there may not be. If they are pulling the temps from, say the sump or at the pump where it just came from the sump where hot return and the cold pool are mixed, then the oil will read cooler than the water..... there is your lag.
I am assuming, I think correctly, that water turnover is faster than oil turnover.
Regarding the coolant... many years ago I ran the engine in my Buick with the radiator cap off and I was amazed at the amount of swirling going on. That water pumped moved some volume. If all cars move water at that rate, there would be consistent temps throughout the coolant volume.
It just doesn't make sense to me that Porsche would go through the expense of creating a laggy oil temp gauge just to mislead us. If the rest of the engine or oil must warm up, then fine, state the OK oil temp in the manual or put a green line directly on the dial. Or, like some manufactures do (BMW so I've been told), limit your RPMs until OK temp is reached. Purposly misleading us is a bot odd...... I've read that there are folks who believe this. Jake Raby noted on more than once that Porsche displays the temps that "they want you to see". Not that I don't believe Jake, but I just don't understand why a maker would purposely dick with gauge readings. I don't see why it would matter.
Peace
Bruce in Philly
Just a word of caution. While coolant and oil temperatures are at nominal operating temperature not all oil is warmed up (and maybe not all the coolant either.) There can be some oil in the sump that believe it or not is really not in circulation and still relatively cold. A large increase in engine RPMs will of course result in a big demand for oil. At this point the oil off to one side of the oil pump intake will get drawn in and this is much colder oil. Granted there is not much of it.
[/quote]
You may have hit on why there is a lag in the oil gauge.... there may not be. If they are pulling the temps from, say the sump or at the pump where it just came from the sump where hot return and the cold pool are mixed, then the oil will read cooler than the water..... there is your lag.
I am assuming, I think correctly, that water turnover is faster than oil turnover.
Regarding the coolant... many years ago I ran the engine in my Buick with the radiator cap off and I was amazed at the amount of swirling going on. That water pumped moved some volume. If all cars move water at that rate, there would be consistent temps throughout the coolant volume.
It just doesn't make sense to me that Porsche would go through the expense of creating a laggy oil temp gauge just to mislead us. If the rest of the engine or oil must warm up, then fine, state the OK oil temp in the manual or put a green line directly on the dial. Or, like some manufactures do (BMW so I've been told), limit your RPMs until OK temp is reached. Purposly misleading us is a bot odd...... I've read that there are folks who believe this. Jake Raby noted on more than once that Porsche displays the temps that "they want you to see". Not that I don't believe Jake, but I just don't understand why a maker would purposely dick with gauge readings. I don't see why it would matter.
Peace
Bruce in Philly
Changed By: Bruce In Philly (2000 S Boxster, now '09 C2S)
Change Date: March 31, 2015 11:00PM
Re: Warm Up of Water & Oil Temps - Durametric DataWhy would the guages be incorrect?
Change Date: March 31, 2015 11:00PM
Re: Warm Up of Water & Oil Temps - Durametric DataWhy would the guages be incorrect?
[quote=MarcW]
Just a word of caution. While coolant and oil temperatures are at nominal operating temperature not all oil is warmed up (and maybe not all the coolant either.) There can be some oil in the sump that believe it or not is really not in circulation and still relatively cold. A large increase in engine RPMs will of course result in a big demand for oil. At this point the oil off to one side of the oil pump intake will get drawn in and this is much colder oil. Granted there is not much of it.
[/quote]
You may have hit on why there is a lag in the oil gauge.... there may not be. If they are pulling the temps from, say the sump or at the pump where it just came from the sump where hot return and the cold pool are mixed, then the oil will read cooler than the water..... there is your lag.
Regarding the coolant... many years ago I ran the engine in my Buick with the radiator cap off and I was amazed at the amount of swirling going on. That water pumped moved some volume. If all cars move water at that rate, there would be consistent temps throughout the coolant volume.
It just doesn't make sense to me that Porsche would go through the expense of creating a laggy oil temp gauge just to mislead us. If the rest of the engine or oil must warm up, then fine, state the OK oil temp in the manual or put a green line directly on the dial. Or, like some manufactures do (BMW so I've been told), limit your RPMs until OK temp is reached. Purposly misleading us is a bot odd...... I've read that there are folks who believe this. Jake Raby noted on more than once that Porsche displays the temps that "they want you to see". Not that I don't believe Jake, but I just don't understand why a maker would purposely dick with gauge readings. I don't see why it would matter.
Peace
Bruce in Philly
Just a word of caution. While coolant and oil temperatures are at nominal operating temperature not all oil is warmed up (and maybe not all the coolant either.) There can be some oil in the sump that believe it or not is really not in circulation and still relatively cold. A large increase in engine RPMs will of course result in a big demand for oil. At this point the oil off to one side of the oil pump intake will get drawn in and this is much colder oil. Granted there is not much of it.
[/quote]
You may have hit on why there is a lag in the oil gauge.... there may not be. If they are pulling the temps from, say the sump or at the pump where it just came from the sump where hot return and the cold pool are mixed, then the oil will read cooler than the water..... there is your lag.
Regarding the coolant... many years ago I ran the engine in my Buick with the radiator cap off and I was amazed at the amount of swirling going on. That water pumped moved some volume. If all cars move water at that rate, there would be consistent temps throughout the coolant volume.
It just doesn't make sense to me that Porsche would go through the expense of creating a laggy oil temp gauge just to mislead us. If the rest of the engine or oil must warm up, then fine, state the OK oil temp in the manual or put a green line directly on the dial. Or, like some manufactures do (BMW so I've been told), limit your RPMs until OK temp is reached. Purposly misleading us is a bot odd...... I've read that there are folks who believe this. Jake Raby noted on more than once that Porsche displays the temps that "they want you to see". Not that I don't believe Jake, but I just don't understand why a maker would purposely dick with gauge readings. I don't see why it would matter.
Peace
Bruce in Philly
Original Message
Author: Bruce In Philly (2000 S Boxster, now '09 C2S)Date: March 31, 2015 11:00PM
Re: Warm Up of Water & Oil Temps - Durametric Data
[quote=MarcW]
Just a word of caution. While coolant and oil temperatures are at nominal operating temperature not all oil is warmed up (and maybe not all the coolant either.) There can be some oil in the sump that believe it or not is really not in circulation and still relatively cold. A large increase in engine RPMs will of course result in a big demand for oil. At this point the oil off to one side of the oil pump intake will get drawn in and this is much colder oil. Granted there is not much of it.
[/quote]
You may have hit on why there is a lag in the oil gauge.... there may not be. If they are pulling the temps from, say the sump or at the pump where it just came from the sump where hot return and the cold pool are mixed, then the oil will read cooler than the water..... there is your lag.
Regarding the coolant... many years ago I ran the engine in my Buick with the radiator cap off and I was amazed at the amount of swirling going on. That water pumped moved some volume. If all cars move water at that rate, there would be consistent temps throughout the coolant volume.
It just doesn't make sense to me that Porsche would go through the expense of creating a laggy oil temp gauge just to mislead us. If the rest of the engine or oil must warm up, then fine, state the OK oil temp in the manual or put a green line directly on the dial. Or, like some manufactures do (BMW so I've been told), limit your RPMs until OK temp is reached. Purposly misleading us is a bot odd...... I've read that there are folks who believe this. Jake Raby noted on more than once that Porsche displays the temps that "they want you to see". Not that I don't believe Jake, but I just don't understand why a maker would purposely dick with gauge readings. I don't see why it would matter.
Peace
Bruce in Philly
Just a word of caution. While coolant and oil temperatures are at nominal operating temperature not all oil is warmed up (and maybe not all the coolant either.) There can be some oil in the sump that believe it or not is really not in circulation and still relatively cold. A large increase in engine RPMs will of course result in a big demand for oil. At this point the oil off to one side of the oil pump intake will get drawn in and this is much colder oil. Granted there is not much of it.
[/quote]
You may have hit on why there is a lag in the oil gauge.... there may not be. If they are pulling the temps from, say the sump or at the pump where it just came from the sump where hot return and the cold pool are mixed, then the oil will read cooler than the water..... there is your lag.
Regarding the coolant... many years ago I ran the engine in my Buick with the radiator cap off and I was amazed at the amount of swirling going on. That water pumped moved some volume. If all cars move water at that rate, there would be consistent temps throughout the coolant volume.
It just doesn't make sense to me that Porsche would go through the expense of creating a laggy oil temp gauge just to mislead us. If the rest of the engine or oil must warm up, then fine, state the OK oil temp in the manual or put a green line directly on the dial. Or, like some manufactures do (BMW so I've been told), limit your RPMs until OK temp is reached. Purposly misleading us is a bot odd...... I've read that there are folks who believe this. Jake Raby noted on more than once that Porsche displays the temps that "they want you to see". Not that I don't believe Jake, but I just don't understand why a maker would purposely dick with gauge readings. I don't see why it would matter.
Peace
Bruce in Philly