Delta variance
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Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
Delta variance
just wanted to get all your thoughts. on a cold soak I am only seeing maybe a degree and a half difference between the gauges.
first pic shows deltas while driving about 40mph with infrequent stops due to traffic
This is now showing after driving 60mph for about 10mins and then running a mild 25mph due to reaching more city streets, these deltas didn't reduce much more than a degree or two with the city driving.
Now I bought the truck from ford dealership with their 2yr premium warranty, if a cooler needs replaced yet no check engine light is present would/could this fall under warranty replacement.
Truck is stock 07 CC shortbed 4wd with 105k miles currently. I can offer some engine bay shots as well if necessary.
I also wanted to mention when towing my 7500lb trailer over the labor day weekend on a grade I would see 15-20* variance going 50mph , EOT never getting above 230 if I recall. My fan kicks on but the sound isn't consistent. it sounds like it revs up then down then up again, would that dictate a bad clutch fan?
first pic shows deltas while driving about 40mph with infrequent stops due to traffic
This is now showing after driving 60mph for about 10mins and then running a mild 25mph due to reaching more city streets, these deltas didn't reduce much more than a degree or two with the city driving.
Now I bought the truck from ford dealership with their 2yr premium warranty, if a cooler needs replaced yet no check engine light is present would/could this fall under warranty replacement.
Truck is stock 07 CC shortbed 4wd with 105k miles currently. I can offer some engine bay shots as well if necessary.
I also wanted to mention when towing my 7500lb trailer over the labor day weekend on a grade I would see 15-20* variance going 50mph , EOT never getting above 230 if I recall. My fan kicks on but the sound isn't consistent. it sounds like it revs up then down then up again, would that dictate a bad clutch fan?
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
And all the readings are in standard US numbers not Celsius... I can't spell it, but u know what I mean.
Hotshot
Joined: Jul 2005
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From: Middle Tn.
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Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
Likes: 114
From: Tuscaloosa, AL
The proper delta (at least as generally agreed on this forum) is warm it up for 15 to 20 minutes doing 65. Then find a flat streak of road (as much as you can) and run 65 for about 5 to 10 minutes. Only at this steady state do deltas mean much.
I like to drive mine 80 mph for 15 minutes then drop down to 65 for 5 to 10 miles. This way, I can see the temps decrease and stabilize. Then I know i'm at a steady state.
My cooling system is spotless, my water pump has 20k miles on it and my oil cooler has less than 5k on it. Did the work myself so I know its spotless. My deltas measured as above are 6 to 7 degrees.
Deltas when towing can vary quite a bit based on load, grade, speed, etc. Your 230 EOT while towing is good. I push an EOT of 245 while towing, but I run 80 mph and tow a 32 foot TT that is essentially a big wind sale.
I know 245 is too high, but I'm running synthetic and i'm working on getting it down by slowing down and changing thermostats. If that doesn't work, I'll look elsewhere.
I like to drive mine 80 mph for 15 minutes then drop down to 65 for 5 to 10 miles. This way, I can see the temps decrease and stabilize. Then I know i'm at a steady state.
My cooling system is spotless, my water pump has 20k miles on it and my oil cooler has less than 5k on it. Did the work myself so I know its spotless. My deltas measured as above are 6 to 7 degrees.
Deltas when towing can vary quite a bit based on load, grade, speed, etc. Your 230 EOT while towing is good. I push an EOT of 245 while towing, but I run 80 mph and tow a 32 foot TT that is essentially a big wind sale.
I know 245 is too high, but I'm running synthetic and i'm working on getting it down by slowing down and changing thermostats. If that doesn't work, I'll look elsewhere.
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Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
Then I must be lucky....
Oil cooler is 40k and my delta's were 3-5 even on a real hot day.
New water pump and coolant change 2 weeks ago to EC-1, I'm now at 1-3 difference. And towing the boat or camper (8k) I'm at 5-10 difference and it's mid 80-95 heat here.
Until now, I was flushing every 15k and I may still do that.
Fix it guy here, sepelling was not my favorite class, tock tow trys to get out of that class....yuck! Still hate it!
Oil cooler is 40k and my delta's were 3-5 even on a real hot day.
New water pump and coolant change 2 weeks ago to EC-1, I'm now at 1-3 difference. And towing the boat or camper (8k) I'm at 5-10 difference and it's mid 80-95 heat here.
Until now, I was flushing every 15k and I may still do that.
Fix it guy here, sepelling was not my favorite class, tock tow trys to get out of that class....yuck! Still hate it!
Fleet Mechanic
Joined: Oct 2012
Posts: 1,558
Likes: 26
From: Bay Area
I flushed my coolant on a used e350 with extremely dirty coolant compared to any gas Vehicle.
I ran it for 30 minutes at 65-70 mph.
ECT 181. EOT 190. Delta ranged from 6-11.
Seems like the T stat is not working properly.
I am running reverse osmosis water until I flush with restore.
Should I change t stat?
I ran it for 30 minutes at 65-70 mph.
ECT 181. EOT 190. Delta ranged from 6-11.
Seems like the T stat is not working properly.
I am running reverse osmosis water until I flush with restore.
Should I change t stat?
Laughing Gas
Joined: Sep 2013
Posts: 1,031
Likes: 13
The proper delta (at least as generally agreed on this forum) is warm it up for 15 to 20 minutes doing 65. Then find a flat streak of road (as much as you can) and run 65 for about 5 to 10 minutes. Only at this steady state do deltas mean much.
I like to drive mine 80 mph for 15 minutes then drop down to 65 for 5 to 10 miles. This way, I can see the temps decrease and stabilize. Then I know i'm at a steady state.
My cooling system is spotless, my water pump has 20k miles on it and my oil cooler has less than 5k on it. Did the work myself so I know its spotless. My deltas measured as above are 6 to 7 degrees.
Deltas when towing can vary quite a bit based on load, grade, speed, etc. Your 230 EOT while towing is good. I push an EOT of 245 while towing, but I run 80 mph and tow a 32 foot TT that is essentially a big wind sale.
I know 245 is too high, but I'm running synthetic and i'm working on getting it down by slowing down and changing thermostats. If that doesn't work, I'll look elsewhere.
I like to drive mine 80 mph for 15 minutes then drop down to 65 for 5 to 10 miles. This way, I can see the temps decrease and stabilize. Then I know i'm at a steady state.
My cooling system is spotless, my water pump has 20k miles on it and my oil cooler has less than 5k on it. Did the work myself so I know its spotless. My deltas measured as above are 6 to 7 degrees.
Deltas when towing can vary quite a bit based on load, grade, speed, etc. Your 230 EOT while towing is good. I push an EOT of 245 while towing, but I run 80 mph and tow a 32 foot TT that is essentially a big wind sale.
I know 245 is too high, but I'm running synthetic and i'm working on getting it down by slowing down and changing thermostats. If that doesn't work, I'll look elsewhere.
Supposedly, this process was created to give technicians a way to determine oil cooler health. I think it's deeply flawed, simply because of the parameters required. 65MPH yields a different RPM and load with trucks configured with different gear ratios and GVWR. A general speed, such as 65 MPH, is simply not a good parameter to use in a test that can be so crucial to the engine's health. A better procedure would be a set RPM to maintain at a specific GVWR.