Originally Posted By: ZeeOSix
Originally Posted By: gregk24
Originally Posted By: Jim Allen
As long as the spring holds the center tube (or cage in this case) tightly against the tapping plate, I don't see why there should be any worried about leakage... regardless of how wavy the media gets
Exactly...I agree. And for a normal OCI, I actually prefer fiber endcaps. I believe they have a better bond with the media. I can see after 10K miles that it might become an issue, but metal endcaps have also been known to separate.
You can use the same argument about the spring holding everything tight together on a filter where the potting material has de-bonded from the metal end cap. The spring pressure will hold it tight so no leakage should occur.
Exactly. And that's why I chuckle when I read the usual Purolator detractors (easily recognized by their regular postings) that attempt to claim that some kind of bypass 'might' take place with the relatively rare endcap separation from potting material upon dissection. An 'extremely' unlikely supposition as long as the retainer leaf spring is functioning properly to hold the element in place firmly holding the adbv against the tapping/base plate. Combine that with the large area and length that a bypass would have to traverse and again it's an extremely unlikely premise.
Contrast that to the many orange cans viewed here that frequently show an exposed metal end of the center tube on dissection (generally bypass/dome end), yet the bypass presumption is not noted by those same posters. The small crimp area also held only by retainer spring pressure over a much thinner and shorter length of fiber (than the potting material on the Puro) over the center tube is all that keeps bypass from occurring in that area. And I've never seen an exposed center tube end either with endcap off or on a Purolator dissection.
Bottom line, can't have it both ways. If it no bypass occurs on the orange can, logic says it doesn't occur on the Purolator either. And, one could make the case that it's actually less likely on the Purolator for the reasons previously mentioned.
