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- Feb 5, 2023
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If they had the old completed end cap that Champion had, this would not be a problem. Add unnecessary engineering adds potential for problems to appear.
List of oil filters with 99% efficiency at 20 microns.
- Thread starter Bill7
- Start date
Here’s a picture of the top. Also a picture of a leaking leaf spring vs a non leaking leaf spring.
We have particle counts worse than the Boss, visual evidence, and calculations of efficiency drop. As well as a @ZeeOSix graph. I measured the two gaps at .75” x .020” each. There’s a monster thread all about the leaks.
Ok thanks, I am going to the store this afternoon to return 4 filters, good thing I saw this on time.
Have to look at it from the side like in @Glenda W.'s photo to see the gap size.
On a high efficiency filter, the calculations basically show that if there is 15% volume leakage, then the impact on efficiency is a 15% drop. If it was a 5% leak, then the efficiency drops by 5%. This was calculated simply by looking what the effect of the leakage would be based on upstream vs down stream particle counts. The leakage was estimated to be 15% on the gaps measured by @Glenda W.'s mentioned in post 204. So a 99% @ 20u filter with a 15% volume leak past the media would drop the efficiency to 84% @ 20u.
If a filter with a metal-on-metal leaf spring to end cap interface was flat and smooth then the leakage would be minimal and the efficiency impact would be very small. But based on some of the photos of that seal area showing big gaps there's definitely some leakage going on, and it will vary with the level of leaf spring ruffles and flatness. Some people may not care, thinking that the leaking dirty oil will get cleaned up with more trips through the filter, which is true, but the leak is constant and like having the filter in partial bypass all the time, and makes the filter less efficiency than it should be.
You would have to see the efficiency vs particle size graph based on an actual ISO efficiency test to know for sure. But from the ISO graphs seen, I'd say that 95% @ 20u and 99% @ 30u are pretty close being on the same curve and not enough difference to worry about. Here's an example from Ascent's efficiency testing. Look at the AC Delco curve.
Great work. I later found the other suggested thread.
Well, here´s my new combo for the Vette. There shouldn´t be any leaking on this filter. And 95% at 20 microns is better than other brand´s premium filters that do 99% at 30 microns, by my estimation. I´m going to get a filter cutter to look at the Endurance that comes off the Vette soon. It will have about 6k miles on it, or maybe a little more. Then, next year, I´ll cut this Extra Guard open and we´ll see how it looks.
Patman
Staff member
The Carquest Premium is 99.5% at 20 microns though…
Who makes it? I hope not Purolator, but I don´t think it would be that efficient if made by them.
Found it at AA for $10, so that is a great value.
Thank you!
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Premium Guard Inc.
Any known issues with those?
It’s the Official BITOG Flavor of the Month…….
Patman
Staff member
Not as far as we have seen, which is why they are very popular here. And they are so easy to find too, since there are so many PG made filters under different labels.
Might last longer than that since PGI made filters seem to not have changed construction for years. Filter buyers want stability, not playing the monthly Whack-A-Mole game.It’s the Official BITOG Flavor of the Month…….
I am going to pick a few up at AA. With a discount code and Rakuten, they'll be about $7.84 each, which is a bargain for that level of performance. My fiance's Jeep 2.4 uses the same filter, too.
