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'99 & up Upgrades and Aftermarket - 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

Thread: External Engine Oil Cooler for 7.3L Reply to Thread
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  Topic Review (Newest First)
09-25-2018 10:08 AM
ArcticDriver
Quote:
Originally Posted by 79jasper View Post
I wouldn't say mine heated up that much quicker, but did make it feel like your face was melting off.....

Sent from my SAMSUNG-SM-G930A using Tapatalk
I phrased it wrong. Its not that it heats up more quickly. Its just that it does not cool off as fast so it reaches a higher temp sooner.
My 7.3’s have all been cold blooded warming up.
I use the AIC to overcome that.
09-24-2018 10:45 PM
79jasper I wouldn't say mine heated up that much quicker, but did make it feel like your face was melting off.....

Sent from my SAMSUNG-SM-G930A using Tapatalk
09-24-2018 10:44 PM
ArcticDriver The only advantage I can see to a 203* is that in winter weather it has more stored heat and would take longer to cool off...making it easier on the starting system and more importantly it would allow the cab to heat up a bit quicker.

09-24-2018 11:03 AM
79jasper I never saw a problem running one in my obs, but I also cleaned the crap out of my radiator. So much so that I ended up with leaks. Lol

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09-24-2018 10:23 AM
blue99stroker Years of use and input.

It commonly pukes coolant out of the degas during summertime, excessive oil temps while towing.

This forum doesn’t see a lot of new info.

With no additional fuel economy gains their really is no point to it. Unless one likes elevated oil temps
09-23-2018 08:14 PM
Calico5
Quote:
Originally Posted by blue99stroker View Post
It’s proven the 203* just raises temps with no additional benefits.
I would definitely fit the oem thermostat and drop temps.
Proven by whom?
I've heard/read nothing negative... although [granated] the positive is somewhat of a sales-pitch.

According to a popular website, the "original" T444e engines used the higher temp T-stats, but changed to the lower 195/197 'stats in the mid 90's.

Again, if your cooling system is in good shape, there's no harm in running a few degrees hotter, IMHO.

Oil is another story. While you definately want to run above 210-212, once the oil temps start approaching the 240's, oil degradation is accelerated.
09-23-2018 07:34 PM
blue99stroker It’s proven the 203* just raises temps with no additional benefits.

I would definitely fit the oem thermostat and drop temps.
09-23-2018 03:00 PM
Calico5
Quote:
Originally Posted by ArcticDriver View Post
Maybe I am not understanding this but wouldn’t the EOT be higher in an engine with a 203* T-stat than an engine with a 192* T-stat?
Unfortunately, yes...

Since the oil cooler is cooled by the "cold" side of the radiator/cooling system, then theoretically the oil temps would be stable regardless of the cooling system temps (providing your cooling system was efficient). Of course, an increase in ambient temps decreases the delta-T across the radiator, which increases the "cold" side temps a bit, which increases the oil temps. Also, the internal temps of the engine are higher with a 203 T-stat, so then the oil temps are higher within the engine and sump, and since the factory oil cooler can only take away "X" amount of heat, the overall oil temp is increased.

Also, I'm running a dual HPOP system, which are known to increase oil temperatures. This is the whole reason to add the additional, external oil cooling: to augment the factory cooler, and keep the temps down under sustained load. If there was an easy way to increase the size of the factory liquid-to-liquid cooler, that would be optimal. But that's not really possible, so adding an external fin-type cooler is the next best thing.


In reality, you can never have "too much" cooling, only "not enough"... (well, except maybe in Alaska in the winter...LOL)



~Al
09-23-2018 02:42 PM
ArcticDriver Maybe I am not understanding this but wouldn’t the EOT be higher in an engine with a 203* T-stat than an engine with a 192* T-stat?
.
09-23-2018 02:33 PM
Calico5
Quote:
Originally Posted by blue99stroker View Post
Just to be clear you added a water temp sensor?
The pcm readout is false.
Ya the 203 thermostat usually raises oil temps 10 degrees. It doesnít do anything beneficial.
???
Not sure what you're asking...

No, I did not add a water temp sensor. On my truck, the factory ECT sensor is not monitored by the PCM (no PCM input), it only feeds the dash gauge. While this is not a super accurate reading, it does indicate relative temperature, and it is an analog reading, not an on-off sensor like the oil pressure gauge sender.

My oil temp is a sump-temperature reading. It is sensing in a port I added to the front oil-cooler header (while it was off for rebuild). I reads the oil temp leaving the pump. The port near the filter (on the rear oil-cooler header) reads temp post cooler, but the more important reading is the highest temperature, which is the sump (pan) temp.

As far as thermostat rating: Supposedly, the higher coolant temps help with combustion efficiency (according to the sales-pitch, LOL). If you have an efficient radiator/cooling system, then the how "hot" the coolant is really doesn't matter. Heat loss in the radiator is about BTU's, not temperature. Whether you're getting rid of the heat at 180F of 210F (at a given load) doesn't matter, it's still the same AMOUNT of heat (in BTU's).
09-22-2018 11:23 PM
blue99stroker Just to be clear you added a water temp sensor?

The pcm readout is false.

Ya the 203 thermostat usually raises oil temps 10 degrees. It doesn’t do anything beneficial.
09-22-2018 09:17 PM
Calico5
Quote:
Originally Posted by klhansen View Post
A suggested improvement. Move your oil cooler to below the radiator. That will put it down into the airstream when at speed and put the radiator's performance back where it was before getting hot air from the oil cooler. The small (IMO) downside would be a bit worse oil cooler performance at low speed as the fan wouldn't draw air thru it. You might check both ways and see which configuration gives you better overall performance.
Yeah, I'm not locked-in to it's current location. It's mounted at the very bottom of the radiator, behind the A/C coil and below the CAC, but in front of the Rad. The larger 60-row Earl's cooler will be a bit taller and wider, and will encroach up into the front of the radiator a little more, but will still be below the CAC. We'll see what happens...
Quote:
Originally Posted by blue99stroker View Post
The injectors orings donít like high oil temps. The internal ones.
Did you ever swap back to the factory 190-192 thermostat?
The 203+ thermostat does make for crazy temps where itís hot. Thatís why I wonít run one. And this has been the hottest summer in awhile
So far, I haven't seen any change in the coolant temp... and yes, I am still running the higher-temp 203 'stat. However, I'm really thinking I may pull it out and go back to the 195/197 'stat also.
09-22-2018 05:52 PM
blue99stroker The injectors orings don’t like high oil temps. The internal ones.

Did you ever swap back to the factory 190-192 thermostat?

The 203+ thermostat does make for crazy temps where it’s hot. That’s why I won’t run one. And this has been the hottest summer in awhile
09-22-2018 12:46 AM
klhansen A suggested improvement. Move your oil cooler to below the radiator. That will put it down into the airstream when at speed and put the radiator's performance back where it was before getting hot air from the oil cooler. The small (IMO) downside would be a bit worse oil cooler performance at low speed as the fan wouldn't draw air thru it. You might check both ways and see which configuration gives you better overall performance.
09-20-2018 10:36 PM
Calico5
Quote:
Originally Posted by jleedog View Post
Very nice setup. Clean looking install. I cant believe you have not seen a bigger drop in temps even while not towing.
Thanks.
Don't forget, the thermostat opens at 200, so temps will always be above that. Also, the 25-row SUSA cooler is just not big enough, IMHO.
Once I get the trailer on, that'll be the test! And getting the larger 60-row "Earl's" cooler on there will make a great difference, I'm certain.

Quote:
Originally Posted by 79jasper View Post
Cant really beat liquid to liquid for efficiency.
Yes, that's true, liquid-to-liquid is better. But then I would be imparting even more BTU's into the coolant, and then that would require a bigger cooling system radiator. Heat is heat... just gotta get it out! LOL

Quote:
Originally Posted by klhansen View Post
Nice install.
But you really don't have anything to worry about unless your oil temps get up to 300F or so. Even at 250F you aren't really hurting your oil (or your engine). Like 79jasper said, a liquid to liquid cooler is way more efficient than liquid to air.
my 2 cents worth anyway.
Thanks Kevin.

I know 240-245 is not THAT hot, for modern engine oil. But, cooler is always better. My experience with industrial engines and hydraulic systems makes me lean towards keeping everything around 215-230. Oil life begins to drastically shorten once temps reach into the 240 range and above. Even modern synthetics, while much tougher than their predecessors, will begin to degrade much faster as the temperature increases above 240. In the last 30 years of wrenching, I've been through hours and hours of trainings and seminars, on industrial engine and hydraulic systems, and this is what I have gleaned from that.

Modern auto manufactures run the oil much hotter than they used to. It's part of the "designed obsolescence" (IMHO)... after all, they don't want their engines to last TOO long! LOL

And yes, liquid coolers are more efficient, however, in the end, it all ends up in the air (since this isn't a boat!).

Anyway, thanks for the positive feedback. I appreciate it. Time will tell as to how well it works!




~Al
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