So we agree that ADBVs can impact startup bypassing and that a well functioning ADBV is better than a poorly functioning one
I heard yall like ADBV blow tests
- Thread starter Hatsuwr
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So we agree that ADBVs can impact startup bypassing and that a well functioning ADBV is better than a poorly functioning one
The filter on my car's engine sits vertically, maybe it should have the ADBV on the other side, so gravity doesn't reverse the flow back to the oil pump......
Well of course, but I'd worry more about a bad ADBV actually causing start-up noises that are not normally there when the ADBV does work correctly - like how a short delay in oil pressure can cause chain tensioners to have cam-chain rattle, etc. I wouldn't worry much about the short filter bypass event, as filters can bypass easier than that given all the other conditions the filter sees in use. Someone simply driving off shortly after a cold start-up could be putting the filter into bypass way more than a short bypass blip one might get if the ADBV let some oil leak out of the galleries.So we agree that ADBVs can impact startup bypassing and that a well functioning ADBV is better than a poorly functioning one
Is that crazy high idle still a thing on some cold engines (2k and over I remember reading here)? Mine likes to idle at 1.3k rpm right now just after startup, could be higher come winter.
Some may ... I've never had a vehicle with a cold start idled that high either. With a cold start idle that high, if the oil was cold and thick enough the filter might be bypassing either way dependent on all kinds of things.
Exactly. Further, only part of adbv that could possibly have effect on upstream/dirty oil being bypassed, is if the central "collar" seal area was somehow compromised. The topic blow test does not specifically show that. So as noted 'for me' unlike the flashlight test results with the FE with oil bypass, if I used topic filters, results here would not keep me from continuing.
If you read my reply to that same comment, you should see how the ADBV can affect bypassing.
I prioritize filtration efficiency over ADBV functionality, but, as demonstrated, there can be a significant difference in ADBV functionality between two filters of the same model.
The definition of "Anti" that I found online: Opposed to; against.
So the ADBV works against drain-back but does not always stop it entirely. If they provided a 100% perfect seal should the filter companies name this part a one way check valve?
So the ADBV works against drain-back but does not always stop it entirely. If they provided a 100% perfect seal should the filter companies name this part a one way check valve?
Some of yall are crazy with the strawmen lol. I don't know if anybody has made the claim that ADBVs need to function perfectly down to the drop in order to be effective or worthy of their exalted prefix. Ideally they would, of course, but in the event that they don't, my humble opinion is that less drain back is more gooder than more drain back.
There are test specs for the ADBV performance. ISO 4548 may have a section, and I believe USCAR-36 has a spec. I'd have to do some digging on a differennt device to find the info. The spec is essentially that it can leak somewhat over a specified time frame.
Dug it up ... it's ISO 4548-9. Can't find a full copy of the spec for free to see the details. Here's the scope.
https://www.iso.org/obp/ui/#iso:std:iso:4548:-9:ed-2:v1:en
And here's some USCAR-36 specs that shows the ADBV leak acceptability.
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After hydrostatically and pneumatically testing 1000's and 1000's of systems, I would say that your statement is false. Some systems with leak with water while not leaking with air and vise versa.
To put it frankly, just because the filter leaks with air under whatever pressure does not mean it will leak under it stated use and in its designed environment.
Good video though
One question: what is the purpose of the experiment?
Decent reference point still, thanks for that. I was planning on using 10 ml or so for the bypass leak tests, then using what gets through for ADBV testing. I'll see about upping the amount a bit, but need to be careful about just saturating the media with it. I'll probably use the filter with the least leaky bypass first for the ADBV test to get an idea for how long I should test the others, since if there is a difference in free oil in the cans, that should be the one with the least.
The devil’s advocate in me says completely fill the inverted filter with oil, then apply air pressure to the center hole. Or get crazy & rig up a way to feed low pressure (like 1 PSI or less) pressurized oil into the center hole…
4548-9 only prescribes the test method including measuring and reporting how much leaks out in an hour.
Makes sense because the efficiency test (for example) is also just the method of testing and not a performance limit.
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You are definitely correct about leaking with air not implying leaking with oil, but that's why I brought up the rate the air was leaking. Probably can't judge it from the video, but it's pretty substantial. Hopefully will have time to do the oil test tonight to be sure though.
Purpose is just to experiment with non-destructive filter testing and see what comes up. In another thread I did a vacuum test to see if differences in leaking could be identified (through bad bypass, tears, bad glue, etc.). Also found some debris from the filters when doing the vacuum test. I'll be trying another bypass and ADBV leak test with oil next.
As far as utility, we'll see about the oil tests, but so far I think in the future I will buy filters in pairs, vacuum out debris, test the ADBVs, and compare them on a vacuum test. If one performs significantly worse on the last test, I'd return it, otherwise save it for the next filter change. Might sound excessive, but it should take less than 5 minutes for all of it.
I did a simple ADBV test about 14 years ago on a Purolator PureOne. It sat for a week after I let the initial oil leak out of the center tube for awhile, waiting until no more leaked out of the center tube. I then let it sit for a whole week with the base down (as shown in the funnel) and nothing leaked out. Then I opened up the ADBV with some folded Q-Tips in the base inlet holes and let the oil inside drain out into an empty glass bottle for a day. That ADBV was sealing 100% with the head pressure of the oil on it. Think I did a mouth powered "blow test" on it when new before installing it and tested "good".
LINK TO THREAD
LINK TO THREAD
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That bypass is looking nice these days...
Never mind, already covered.
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