Originally Posted By: ZeeOSix
Originally Posted By: mr_diy
Originally Posted By: KCJeep
Good videos. At 3:10 on the first Fram video, you can see why the filter pleats at the media seam are typically larger at the seam, its the way the machine is holding the media when it slides onto the center tube.
I zeroed in on this too. The problem as I see it is with some pleats spread, it leaves others compressed so they don't appear to leave a path for oil to flow thru, thus reducing the media area in play. Cartridge filters don't seem to have this issue, and must have an addition process to re-space pleats. Wire backed media also solve the spacing.
I doubt they are so compressed that oil restriction occurs. Keep in mind that with a positive displacement oil pump, the pump will force the exiting volume through the filter & engine even if there is a hair more restriction in the filter - as long as the pump isn't in pressure relief (at like 70 ~ 80 PSI). A few "tighter looking" pleats really shouldn't make any real impact to flow IMO.
I wasn't implying filter flow restriction, just that oil will take the least restrictive path of single layer media. Thus the bulk of the compressed pleats will not be effective. Stop the video when the end of the media is visible and can see tightly compressed pleats.
Originally Posted By: mr_diy
Originally Posted By: KCJeep
Good videos. At 3:10 on the first Fram video, you can see why the filter pleats at the media seam are typically larger at the seam, its the way the machine is holding the media when it slides onto the center tube.
I zeroed in on this too. The problem as I see it is with some pleats spread, it leaves others compressed so they don't appear to leave a path for oil to flow thru, thus reducing the media area in play. Cartridge filters don't seem to have this issue, and must have an addition process to re-space pleats. Wire backed media also solve the spacing.
I doubt they are so compressed that oil restriction occurs. Keep in mind that with a positive displacement oil pump, the pump will force the exiting volume through the filter & engine even if there is a hair more restriction in the filter - as long as the pump isn't in pressure relief (at like 70 ~ 80 PSI). A few "tighter looking" pleats really shouldn't make any real impact to flow IMO.
I wasn't implying filter flow restriction, just that oil will take the least restrictive path of single layer media. Thus the bulk of the compressed pleats will not be effective. Stop the video when the end of the media is visible and can see tightly compressed pleats.