Originally Posted By: rustypigeon
Originally Posted By: dnewton3
Of course, that's Wix current approach to white-washing all the data. They started that a few years ago. They've pretty much put that throughout the whole product line, save for a few stragglers.
If you want to see the real numbers, hop over to FleetFilter and they still have the archived older beta data that is unique to each filter. At some point, I suspect that will disappear as well, but until then it's our last bastion of hope.
I would think that if the same media type is used on each filter, the beta ratio would be the same. Yeah the smaller one would get more efficient faster as it starts to collect particles, but in the beginning, they should be the same. Right?
Theory is that with a larger filter it has more media surface area, and therefore less delta-p across the media with the same oil volume flowing through it during beta testing.
A later delta-p can cause some particles to be pushed through the media that would have normally been trapped if the delta-p was lower. So theoretically, a larger filter using the same exact media as a smaller filter would have a slightly better beta ratio (efficiency). That's one reason you see the filter manufacturers reference a pretty large filter with their ISO efficiency rating. Also a theory on why the 4 smallest Purolator spin-on filters are rated at 40 microns instead of 20 microns in their advertised efficiency.