Deltas after adding coolant filter

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Jan 31, 2013 | 09:09 PM

altruego

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Deltas after adding coolant filter

I installed a coolant filter yesterday on my 2005 F-350 PSD. No issues with the install. I got a chance to take it out on the open road today and I noticed my EOT/ECT deltas are 2 degrees higher than before installing the coolant filter.
Deltas before the filter install were 6-8 degrees. After the install 8-10 degrees.

Has anyone else seen this? My theory is the the small amount of coolant leaving the block early is lowering the ECTs a few degrees. But I am a little puzzled.

The outside temp was in the high 40's.

Jan 31, 2013 | 09:38 PM

BLADE35

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From: Saratoga Springs,UT

What was ECT at when you took the readings????190*??

Are all your ECT & EOT & TFT the same or within 1 or 2* after a 12 hour cold soak???? At Startup

Feb 1, 2013 | 09:54 AM

altruego

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The cold soak temps are spot on.

The ECT didn't go up to 190. The max I saw was 188 which kind of confirms the fact that the small amount of coolant going around the bypass filter is causing the engine to run a few degrees cooler.

If i get a chance today I will do some tests with shutting the bypass and watch the temps and then open the bypass and see what changes.

Feb 1, 2013 | 10:20 AM

ChrisAU

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Why would the small amount of coolant going around the bypass cause the engine to run cooler? You aren't bypassing the t-stat.

Feb 1, 2013 | 01:35 PM

altruego

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I'm pretty sure the coolant bypass circuit is not bypassing the t-stat

Feb 2, 2013 | 03:04 PM

bpounds

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From: Whittier, CA

Delta temps are constantly changing as engine load changes, outside air temp changes, etc. I don't believe you can really say you have 2° difference after the install. The values are not steady enough to make such a precise determination.

Relax. Don't worry. Be happy.

Feb 2, 2013 | 03:27 PM

BLADE35

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From: Saratoga Springs,UT

I agree with Bill^^^

2* is Nothing

188* ECT is very Common Hell thats where my truck runs

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Feb 2, 2013 | 03:39 PM

bpounds

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From: Whittier, CA

Quote:

Originally Posted by altruego

I'm pretty sure the coolant bypass circuit is not bypassing the t-stat

Actually it does. Your t-stat limits flow to the radiator, so that the engine will warm up and maintain a constant temperature. Your heater core uses coolant directly from the engine, and is not controlled by the t-stat. The coolant filter installs in the heater core circuit.

I don't really think there is enough extra cooling from the filter circuit to make any difference in what you see on a temp gauge. Like I said, the temp is constantly moving up and down, and you wouldn't notice 2°. But theoretically it could make a difference, because it is added coolant flow that bypasses the t-stat.

I also think your t-stat is a bit on the tired side. You could use a few more degrees of running temp. Not a big deal yet, but keep an eye on it.