No, 15um(c) was the lowest I went on this one.
Your welcome! Thank you!
Glad to hear you're on the mend back to normal.
Andrew might have data to plot the efficiency vs test run time ... if so, that might show the "hockey stick" shapped curve where the efficiency starts out high and slowly decreases as the filter loads up (delta-p causes already captuired debris to beak loose), and then suddenly get more efficient as the media becomes nearly fully clogged before the bypass valve would open.
Yes, a pre Determined DeltaP determines the end of the test. In our case I choose 8PSID over clean assembly. For the ISO 4548-12 multipass test the average of readings taken every X seconds over a 5 min or 10 min time interval are averaged and reported depending on how long the test takes to reach that Terminal DeltaP.
In this case efficiency did not get significantly better over time and exhibit that behavior. The "Hockey Stick" is demonstrated in the deltaP Curve vs Time. The Medium Test Dust was injected at approximately 2.1-2.2grams every five minutes for each filter.
That would be a marginal improvement, yes.Yeah as much as I want to like the XP filter, I don't have the will power to purchase it seeing how poorly it works, so back to the Boss oil filter I go
Yes, so for AC Delco efficiency dropped off with time/loading. I wonder if that was true for all.
Cool graph! I have the data you need to determine that for the all the others, but it is all in a PDF Format, which I do want to post on here. Send me your email in a private message.
This is exactly how the "hokey stick" efficiency curve starts out. As the delta-p increases, already captured particles in the media start sloughing off and going down steam which the particle counter sees as worse efficiency. I've posted about this many times, but nobody seems to believe it, lol.
It is possible if I choose a higher Terminal DeltaP this could have happened.
At this point, I hope you're OK man!!!
I will message you the full reports, and you can show them that, perhaps it will clear things up a touch.
O no! I hope you get better! My chest definitely does not feel right, but I just figured it was the pneumonia. I understand, it totally wiped me out for a month and it is still getting me pretty good. I got scared when I heard what sounded like rice crispys popping in my chest. They did an X ray and said I had covid lungs real bad.
Years ago Jim Allen posted info HERE he got from an engineer that stated "....the average filter in the average car at the average OCI/FCI is less than 50% loaded when removed. Doesn't apply to everyone, of course, but i you have your inputs under control (mainly a good air filter) then you should fit at or below that average....". I'd say the average bitoger comes nowhere near the holding capacity of any filter they run.
