DEGAS PRESSURE

roamaround · 2019-05-18 15:57:32

https://cimg7.ibsrv.net/gimg/www.ford-trucks.com-vbulletin/603x500/_rev_x_analysis_8a8da76f9b9fe203d87bee09ff7c68cd1b092c0f.jpg Rev-x analysis

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May 18, 2019 | 06:32 PM

#16

bismic

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Rev-x analysis

May 18, 2019 | 07:24 PM

#17

roamaround

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Quote:

Originally Posted by bismic

Rev-x analysis

This is amazing information. I assume this is a a straight analysis of Rev X? May I show this to Webscope labs. They can now not freak me out anymore. Maybe I should change labs.

May 18, 2019 | 08:23 PM

#18

bismic

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feel free to do so

May 18, 2019 | 09:09 PM

#19

roamaround

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Quote:

Originally Posted by bismic

feel free to do so

Thank you👍

May 23, 2019 | 03:10 PM

#20

roamaround

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Quote:

Originally Posted by bismic

15 psi should hold for at least 4-5 hours, but leak free it should easily hold overnight.

Concentration just needs to be close to 50/50. A few percent either way isn't going to be an issue.

That looks like a decent cold fill level.

Basically if you fill the degas bottle too full, the pressure will go up. If the concentration is significantly weak, the pressure will go up. If you have a slight leak, the pressure may be falsely low. Sounds like you are ok. Personally I wouldn't be worrying assuming your system is relatively leak free.

On earlier test it was slowly leaking out degas cap cold tests.

Replaced Degas cap then 24 hour test. I put in 14.75 psi. At 6pm. Ambient temp 60 degrees.
Dropped to 13.5psi over night @ morning ambient temp 50 degrees. Then back up to 14psi at 6pm after hottest part of the day. Ambient temp was 75 degrees. Thoughts on good holding. Seems it is good. Who knows might be higher now while driving. Of course I will release pressure before I start truck and check psi. I did take cap off while hot after drive last week, Put it back on never got above 2.5 to 3psi. Does this generally mean no cracked heads or HGs issues?

Not even sure if this reading could tell HG issues or cracked head. Thinking it may need to be hot and pressure from combustion to push under HGs. with a starting HG problem.

May 23, 2019 | 03:21 PM

#21

bismic

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You are supposed to vent it completely when fully hot and THEN drive it again to see if it rises again. Did you do that?

It does sound like it is holding fine now.

May 23, 2019 | 03:49 PM

#22

roamaround

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Quote:

Originally Posted by bismic

You are supposed to vent it completely when fully hot and THEN drive it again to see if it rises again. Did you do that?

It does sound like it is holding fine now.

I did do this. Pulled cap off slowly when hot. Drove again and held between 2 and 3psi depending on throttle. I would think it would get back to higher psi if cracked head or HGs.

Cap off and back to 0 psi while hot is just a test right? Not supposed to continue it's life like this correct? It'd always have a vacume when cold then.

May 23, 2019 | 04:22 PM

#23

bismic

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The way it is designed is that pressure develops as the liquid expands as the coolant heats up. If you vent it when already hot, it should not develop much pressure after that .... UNLESS you have leaking head gaskets or a leaking EGR cooler.

Sounds like you do not have an issue.

.... and you are correct, you do not want to drive around w/ a vacuum in the degas bottle. It needs the 8-12 psig for boil-over protection.