Yet Another EOT/ECT Question
Lead Driver
Joined: Feb 2011
Posts: 8,241
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From: L.A. (Lower Alabama)
That sounds like a blast! Great way to have fun with the kid(s) also. What kind of speeds/times are you running?
Posting Guru
Joined: Oct 2011
Posts: 1,076
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From: Las Vegas, Nevada
Im glad this was brought up. Since I have started monitoring mine, I usually stay within 10*traveling at highway speeds,(194 EOT and 185 ECT . During driving around town,they stay within 5-7* with the EOT being in the 188-189 range. Seems pretty good to me, what do you pro's think?
As I recall, the correct test is the engine at operating temp. ECT at 190* and steady 65 mph for about 10 miles; EOT temp. should be less than 205* (less than 15* difference)
Senior User
Joined: Aug 2012
Posts: 163
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From: Chester, Va
Those temperatures are the same as my Excursion after I changes the oil and egr coolers and it has been installed about 15,000 miles no matter what the outside temperaturep. The EOT does sometimes get above 220* when the speed is above 80 mph and ECT temp. stay within 13* or lower. The delta also get above 15* for short period of time when going up incline and winding road at speed above 80 mph but cool down within minutes after the road level out.
As I recall, the correct test is the engine at operating temp. ECT at 190* and steady 65 mph for about 10 miles; EOT temp. should be less than 205* (less than 15* difference)
As I recall, the correct test is the engine at operating temp. ECT at 190* and steady 65 mph for about 10 miles; EOT temp. should be less than 205* (less than 15* difference)
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Cargo Master
Joined: Apr 2010
Posts: 3,236
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From: Shelbyville, Indiana
Some of the aftermarket oil coolers have larger-but fewer passages. The idea being it's harder to clog them up but I've read several posts where the EOT runs higher with that design. I looked on the Sinister site (MKM) but really couldn't tell how their's is made.
Either it's one of those designs, or possibly there is still trash in the coolant system and the new cooler is clogging.
Either it's one of those designs, or possibly there is still trash in the coolant system and the new cooler is clogging.
I'm also curious if a little bit of oil residue in the coolant could reduce the heat transfer in the oil cooler, even if the cooler isn't plugged?
If the flow is "too" good through the oil cooler, could the EOT be going up? i.e. the oil and the coolant aren't in the cooler long enough to actually cool the oil all the way?
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
So what you're saying is my deltas might be the result of the oil cooler design or it might be plugged again?
I'm also curious if a little bit of oil residue in the coolant could reduce the heat transfer in the oil cooler, even if the cooler isn't plugged?
If the flow is "too" good through the oil cooler, could the EOT be going up? i.e. the oil and the coolant aren't in the cooler long enough to actually cool the oil all the way?
I'm also curious if a little bit of oil residue in the coolant could reduce the heat transfer in the oil cooler, even if the cooler isn't plugged?
If the flow is "too" good through the oil cooler, could the EOT be going up? i.e. the oil and the coolant aren't in the cooler long enough to actually cool the oil all the way?
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Cargo Master
Joined: Apr 2010
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From: Shelbyville, Indiana
Hmmmm...I wonder if I could test that theory with an orifice in the oil cooler coolant out line...has anyone tried that?
Senior User
Joined: Aug 2012
Posts: 163
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From: Chester, Va
What about using another inline cooler like a trans cooler with a temperature controlled fan? Bad idea? Or just too much going on.
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Really, two issues at happening in that situation. Coolant flows quicker so less time for heat transfer and there is less surface area if the plates are fewer.
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Cargo Master
Joined: Apr 2010
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From: Shelbyville, Indiana
Since I see the coolant temperature change between the new thermostat and the old thermostat and I see the exact same change with in the oil temperature, I've determined that it is safe to assume that the oil cooler isn't plugged.
Now to determine the most cost effective next step.
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Cargo Master
Joined: Apr 2010
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From: Shelbyville, Indiana
So slowing the coolant should improve the heat transfer...
Certified Thread Hijacker
Joined: Aug 2001
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That has crossed my mind.
Since I see the coolant temperature change between the new thermostat and the old thermostat and I see the exact same change with in the oil temperature, I've determined that it is safe to assume that the oil cooler isn't plugged.
Now to determine the most cost effective next step.
Since I see the coolant temperature change between the new thermostat and the old thermostat and I see the exact same change with in the oil temperature, I've determined that it is safe to assume that the oil cooler isn't plugged.
Now to determine the most cost effective next step.
Josh
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Cargo Master
Joined: Apr 2010
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From: Shelbyville, Indiana
Sounds interesting...except I don't have an EGR cooler on the engine anymore and the one in the box on the shelf in the garage has a hole in it somewhere...I'm keeping it just incase I ever have to plug it and dummy it into the engine in the future.
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Just need to get my hands on one of those remote filter setups to see how the hardlines are attached etc to figure out the new oil lines will work.
Josh
Senior User
Joined: Jan 2008
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We only run 300ft, if we went asphalt, we would be running 1/8 mile. Mine runs in the 3.9 sec range at around 81mph, my daughters is in the 4.4sec range. Lots of fun and money. Lol. I started her doing it when she was 12yo, she is 22 now.
In comparison,to your new coolers and temps, it seems as though mine is fairly healthy, and that makes me and my truck happy. However, I have a new Ford oil cooler that I got for free, so im gonna go ahead and install it when I do the EGR delete and a few other things.
In comparison,to your new coolers and temps, it seems as though mine is fairly healthy, and that makes me and my truck happy. However, I have a new Ford oil cooler that I got for free, so im gonna go ahead and install it when I do the EGR delete and a few other things.
Senior User
Joined: Jan 2008
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I think that's generally true, except for some diesels. I used to push my GTO through the staging lanes by hand and it was a street car! I tried to launch at 150* or less. It took a full tenth of the 1/8 mile time from 190*. Later in the night (if I was still in the running 
) there wasn't enough time to cool off good between rounds even spraying down the radiator, it would slow down a little unless the ambient temps dropped a lot or I "compensated" 
.
Sorry OP
) there wasn't enough time to cool off good between rounds even spraying down the radiator, it would slow down a little unless the ambient temps dropped a lot or I "compensated" .Sorry OP
. Just curious about yours. Do you still have it?