I thought most of the new ones had louvers. After a quick search the really wavy ones had holes and no wire backing.
When they first nefariously switched media they kept the frame the same. Granted eliminating the wire screen gave room for more media, & with it more densely packed, less likely to tear. I think they put the larger diameter louvered tube in to make shorter pleats & further strengthen the media against wavyness possibly leading to tearing.
The price difference between an XG or FE is not much …
Well, was a tactical flashlight used?
Only one way to know ... cut the filters open and inspect for any leakage gaps or not after an official ISO test is done. If filters with leakage have worse efficiency than the same ones without leakage, then you'd know the effect on efficiency. Bring lots of money!
You missed the whole logic of inspecting for leakage gaps after efficiency testing to see if the cause of a low test efficiency can be detected. If you tested 10 filters of the same brand and model, and 4 of the 10 had lower efficiency and were also the only ones with visible leak path gaps, then you could conclude the leakage effected the efficiency. Simple testing logic.
Getting into the weeds here....This isn't about quality control of a specific filter.
It was the burn test months ago on the anti drain valve now it is the flashlight.....
Well the comparison will be skewed if one of the filters had a faulty bracket (spring). If this is a production flaw with some bad, some good, no way to tell until the autopsy (much like rabies).
You're deflecting and changing the focus of the conversation. The point is, if there's a gap where dirty oil can leak through, the only way to know if that gap leakage effects the efficiency is to correlate a lower than expected efficiency (ie, compared to a filter with no leakage) is to cut the tested filter open for a visual inspection to look for leakage paths. Unless you have Superman with X-ray vision working in the ISO efficiency lab, lol.
You’re getting into quality control issues and there’s no evidence that they ( Fram Endurance for example) has one.
It's already been shown that putting a lot of force on the leaf spring ears will not close the gap. The area of the leaf spring around the center tube will not deflect by putting force on the ears, it's too stiff in that area. If a gap is seen when the filter is inspected after cutting it open and a decent force is put on the ears, it will also have the same gap if assembled and never cut open.
As I've pointed out multiple times, who knows if the actual filters used to determine the ISO efficiency rating had a gap and leaked or not. Could be they were not leakers at the time they were tested, and now the manufacturing quality has gone down and they do have leaky gaps as seen. Again, you'd have to conduct a controlled test program to verify if the gap effects the efficiency to any degree. It's simple testing protocol.
You don't think bad manufacturing and quality control that can cause dirty oil leakage can't have an effect on efficiency?
Can you prove it's not, lol.
