Interesting very dry and wondering if this flex hose is blocked, getting OEM in meantime and will check flow
https://imgur.com/a/Ey7Iydh
New Engine Build And Now Getting 120 Psi On Oil Pressure
Started by
postve
, Jun 29 2025 10:04 AM
Best Answer Spider , 29 June 2025 - 06:51 PM
I think your gauge is wrong and leading you on a goose chase.
The Oil Filters are only rated to 100 PSI. At around 120 - 130 PSI the can deforms and will eventually rupture. Even at 100 PSI, you can feel it ballooning. I'd say here too that the 120 PSI is likely all that the sender will allow and if it was able to measure the problem - assuming there really is one - then the pressure will be higher.
If you have a high oil pressure problem, a very common cause for it being this high is the plug on the front of the block has been fitted too deep and it is blocking off the vent port at the back of the Oil Pressure Relief Valve. This one has a slot head plug fitted, but depending on your engine, this is usually a brass plug or a blind pop rivet
If that is in too deep, it will block off the passageway behind it and your oil pressure will be sky high, way over 150 PSI. At these pressures it's a race between the oil filter can blowing up, the oil pump gasket blowing out or depending on the oil pump, the drive for it shearing off.
One test for this is to leave the engine for a day or 2, so the oil will drain back, then remove the spark plugs and crank it over, at first, it will crank quickly, but wehn it gets 'wet' again, it will slow to a crawl, like hitting a brick wall.
BUT
I suspect your gauge is leading you up the garden path here.
Try a known mechanical gauge first before doing anything else. See what that's showing and we can do some more fault finding before going too far.
If you need to change the Valve, as Nick has mentioned do not use the Ball type, they are not suitable for road use;-
https://www.theminif...huttle-vs-ball/
61 replies to this topic
#17
postve
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#20
nicklouse
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Posted 29 June 2025 - 02:11 PM
All the same image.
#21
postve
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Posted 29 June 2025 - 02:16 PM
Ahh try these as will
Post separate
https://imgur.com/a/GZhbY8j
https://imgur.com/a/DGhFHwT
https://imgur.com/a/keU8tmE
Post separate
https://imgur.com/a/GZhbY8j
https://imgur.com/a/DGhFHwT
https://imgur.com/a/keU8tmE
Edited by postve, 29 June 2025 - 02:17 PM.
#23
postve
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Posted 29 June 2025 - 02:25 PM
Nick, Ethel, now I do have a steel ball and mini spares recommends replacing the cup and or plunger with the ball - I am assuming the massive putting on the cup may be part of the issue? Hopefully you can see the last image?!
#24
imack
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Posted 29 June 2025 - 02:59 PM
My mistake, of course the oil pressure is measured in the main gallery after the filter.
A stuck shuttle could account for high oil pressure, but I still don't understand why the filter had "little to no oil" in it.
If you install the ball bearing (not recommended by some) you're likely need to shortened the spring by a few coils as they will give a longer overall fitted length than the shuttle and cause high oil pressure.
A stuck shuttle could account for high oil pressure, but I still don't understand why the filter had "little to no oil" in it.
If you install the ball bearing (not recommended by some) you're likely need to shortened the spring by a few coils as they will give a longer overall fitted length than the shuttle and cause high oil pressure.
#25
postve
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Posted 29 June 2025 - 03:06 PM
Strange as one of the images seems to show the filter okay but anyways , I am not too keen to cutting the spring unless you have a recommendation of how many rungs (two rungs ya think??) here’s image of. Ball I have
https://imgur.com/a/VvsV9sf
https://imgur.com/a/VvsV9sf
Edited by postve, 29 June 2025 - 03:07 PM.
#26
imack
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Posted 29 June 2025 - 03:52 PM
Might just be your photo, but that ball bearing looks very small.
This is one I bought from minispares a long time ago.
It's trial and error shortening the spring until you reach your desired oil pressure.
This is one I bought from minispares a long time ago.
It's trial and error shortening the spring until you reach your desired oil pressure.
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#27
postve
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Posted 29 June 2025 - 03:56 PM
Will check tomorrow when I get back home
#28
postve
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Posted 29 June 2025 - 04:28 PM
Ima k, the one you show me was the exact measurements
#29
imack
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Posted 29 June 2025 - 04:58 PM
Just the photo making it look small then.
#30
postve
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