New Oil Cooler, but EOT/ECT delta is high!? - Ford Powerstroke Diesel Forum
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Old 04-25-2011, 11:00 AM
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New Oil Cooler, but EOT/ECT delta is high!?

I just got my truck done after installing the sinister EGR delete, a new ford oil cooler, and ARP studs and flushing and using EC-1 and Mitch's instructions.

I did not have the Edge Insight to monitor anything before we tore the truck apart, but now that its back together there is a pretty solid 10 deg delta when cruising around. We did not flush the coolant prior to pulling everything apart, but afterwards flushed it over and over and over until all the flush was out and it was clear.

Are there certain circumstances where it is ok to have a larger delta? I have not really done a long highway cruise yet. Tonite I have to go for a drive, so if I set the cruise at 70 for 20 minutes or so, would the numbers I am getting then be meaningful?

This has got me pretty frustrated.
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Old 04-25-2011, 11:07 AM
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What are your temps, and wondering if you put in a new themostat when you did the flush?
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Old 04-25-2011, 11:17 AM
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good question, no I have not put in a new T stat.

The temps sit about 182 ECT and 192 EOT. Around town driving it averages about 10 degree delta. On occasion I have noticed it within 2 or 3 degrees, but most of the time its about 10 degrees difference with city driving.
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Old 04-25-2011, 11:27 AM
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If you drop in a new T-stat and get your ECT up around 190 you will be better off. You EOT will also go up but maybe not quite 10 degrees delta. 10 is not bad, although should be lower with new oil cooler. I don't know if removing the EGR normally raises or lowers the delta. I'd do the T-stat and monitor it.

It seems to be normally recommended that you run for about 2 minutes at about 65 MPH to get a good temp delta reading. Driving styles can dictate lower delta than what you'll see there, just like running a bunch of boost for an extended period will make them grow, and even spike past 15 degrees. With city driving I would expect it to be lower
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Old 04-25-2011, 12:38 PM
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I agree with changing the thermostat. Your ECT should be around 192*. 10* delta at 70mph is no reason to get concerned. When putting around it should be around 4*-6*.
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Old 04-25-2011, 12:56 PM
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So under a lot of load, the delta will be bigger, correct? My commute is over a mountain pass and I am not the worlds most passive driver.
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Old 04-25-2011, 01:17 PM
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Quote:
Originally Posted by emperorjordan View Post
So under a lot of load, the delta will be bigger, correct? My commute is over a mountain pass and I am not the worlds most passive driver.
Correct. You can see it working harder on what would seem to be a pretty flat stretch of road by watching the EGTs. They move around as the load changes much quicker than the oil temp.
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Old 04-25-2011, 01:48 PM
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I will do some intense monitoring this evening as I cruise down the coast! Thanks guys for all the input!
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