what is considered "high" deltas??? - Ford Powerstroke Diesel Forum
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post #1 of 25 Old 07-01-2013, 03:45 PM Thread Starter
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what is considered "high" deltas???

Hey everyone. Ive had my 6.0 for about 3 years now and have done A LOT of work to it as preventative maintenance, never had to replace anything because it went bad (besides the black onxy HG's) This weekend i towed about 7k lbs for about 3 hours and my Deltas maintained a difference of 30-35 degrees with the EOT reaching 240-245 and the ECT sitting around 210. When im driving on a regular basis NOT towing my deltas sit around 10 degrees difference. When i had the HG's done about 40k miles ago i also had the oil cooler replaced since it the top of the motor was apart. Im about to drive to Florida (not towing anything) in a month, can i get everyones professional opinion if i should be worried about the oil cooler or does this seem normal while towing?? Also ive had a coolant filter kit on for a few years also. Opinion really appreciated!! Thanks
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post #2 of 25 Old 07-01-2013, 03:57 PM
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Ive heard the guys say that the DELTA 15* rule does not apply when pulling a trailer. So with you running a 10* spread Id say have a good trip!

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post #3 of 25 Old 07-01-2013, 05:28 PM
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In my opinion I'd say you oil cooler is clogged, or at least starting too. From what I've read on forums you can still be in the safe zone as far as deltas are concerned with freeway or moderate driving in town and still have a clogged or clogging oil cooler. I've read that a good oil cooler will have no problem keeping the differences maintained in the safe zone even with loads twice as heavy as yours. Also to be honest 10* delta for daily driving sounds a little high to me. I've read that they should down closer to 4* to 8* difference. Also do you still have the egr cooler on you truck?

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post #4 of 25 Old 07-01-2013, 05:54 PM Thread Starter
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Thanks for the feedback guys, very much appreciated. Still undecided on what to do. The EGR deleted 3 years ago when i had the HG's done the first time. I dont know if it matters or not but in the past 3 yrs (40k miles) the truck has has a R.R. fuel return, powermax turbo, banks intercooler, the coolant filtration as mentioned in post 1, heater core, water pump. Keep the opinions coming guys, very much appreciated!
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post #5 of 25 Old 07-01-2013, 05:59 PM
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From my understanding, the best way to see if your cooling properly, is a wide open throttle test.

Get up to normal temps, go wide open to get the oil hotter than normal, then back down to 60 mph and see if your temps go back to normal quickly.

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post #6 of 25 Old 07-01-2013, 06:29 PM Thread Starter
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ill give that a shot this week and see how it does
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post #7 of 25 Old 07-01-2013, 06:34 PM
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Quote:
Originally Posted by DieselnDrums View Post
In my opinion I'd say you oil cooler is clogged, or at least starting too. From what I've read on forums you can still be in the safe zone as far as deltas are concerned with freeway or moderate driving in town and still have a clogged or clogging oil cooler. I've read that a good oil cooler will have no problem keeping the differences maintained in the safe zone even with loads twice as heavy as yours. Also to be honest 10* delta for daily driving sounds a little high to me. I've read that they should down closer to 4* to 8* difference. Also do you still have the egr cooler on you truck?
I would say false to this. You can't determine this when pulling a load. The delta test should be performed around 55-60 mph on flat ground WITHOUT a load. Above 13 and plan on doing an oil cooler in the future. Search the forum a little more and there are hundreds of threads about this. I think you are fine.

Probably could use a coolant filter. On the interstate using Vivian's Looney tune running 85 mph going from north Ga to Daytona beach Florida last month mine was around 8-12 delta. You should be fine.

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post #8 of 25 Old 07-01-2013, 06:35 PM
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Quote:
Originally Posted by ngaraiderman View Post
I would say false to this. You can't determine this when pulling a load. The delta test should be performed around 55-60 mph on flat ground WITHOUT a load. Above 13 and plan on doing an oil cooler in the future. Search the forum a little more and there are hundreds of threads about this. I think you are fine.

Probably could use a coolant filter. On the interstate using Vivian's Looney tune running 85 mph going from north Ga to Daytona beach Florida last month mine was around 8-12 delta. You should be fine.

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My bad! Just saw you already had a coolant filter

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post #9 of 25 Old 07-02-2013, 08:19 AM
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IIIRC the speed at which the test is done at is between 60 and 65 mph

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post #10 of 25 Old 07-02-2013, 08:22 PM
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I don't want to derail this thread or take away from the OP but Shouldn't the deltas still be relatively in the safe zone even if you are towing a pretty heavy load? To be honest I'm still just trying to get accurate information on this cause from the research I've done it's been a pretty even 50/50 split on how people feel about the deltas when towing. Some say it's fine and other say that it's clogging. I guess it's time to do some more research.

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