I ran across this:
I wonder if that's the reason PureOne uses a string around their center?
I guess if going with paper, the thicker/denser the better(less flex).
I don't know about a big difference in engine life, but I do think the desorption of contaminates due to media flex seems logically probable.quote:
"The following information is not specific to the PF35L, but I'm hoping that it applies. A few years ago, we were working with a filter manufacturer that was promoting synthetic (glass fiber) powertrain oil filters. They had extensive data on the difference between that type of filter and a conventional paper filter. While the synthetic filter is rated for smaller particle collection, that is not the only significant advantage. When filters are rated, they frequently do a so-called "multi-pass" test. I don't remember all the particulars, but contaminated oil is circulated through the filter, under constant flow, a number of times, and the amount of particle removal or collection (cannot remember which way it is tested) after a specified number of passes, determines the micron rating. All the dirt is not removed in one pass. This standard steady state test, with a constant flow, does not tell the whole story, however. What this filter company demonstrated was that when a filter is subjected to pressure or flow surges (such as when starting with cold oil, or even as the flow changes), the filter media will flex. Paper media will then tend to release some of the contaminants back into the flow stream, in a process termed "desorption The standard multipass test will not show this to be a problem, but the release of the contaminants was very significant, and negated much of the advantage of the filtration. The glass fiber media was much more resistant to desorption than the paper media. It also took out more of the contamination in the first pass. But was also considerably more expensive. My employer, Caterpillar, then co-developed a filter with a patented spiral wrap strap around the media to prevent flexing and desorption. So, lacking the ability to use a Caterpillar filter (I don't yet have one of our 10.2 liter diesels in my 93 T/A, I'm using the PF35Ls with great confidence that they will make a big difference in engine life."
{Terry Quinn}
I wonder if that's the reason PureOne uses a string around their center?
I guess if going with paper, the thicker/denser the better(less flex).
