Oil filter flow and filteration

[shibby6600]

Just a hunch, but I bet the hole design/shape/flow characteristics was given zero thought. The engineers designed a machine to efficiently make holes in a sheet of metal, rolled across a plate/conveyor. Instead of punching a clean hole, it's probably a toothed wheel rolled over the metal sheet so they can manufacture these quickly, and leaves zero waste behind (versus a punched hole). Everyone's getting a little overboard with how these are bad, flow data, etc., but until there is data of any filter with this design causing a failure (or at the very least increased UOA levels) everything is hearsay.

 

[ZeeOSix]

Originally Posted by 4WD
Yeah … the old style punched tube (flat stock) made donut holes … this is just a shear and fold … think the flow regime is not that wild …


Yeah, some oil flow past rough metal edges isn't going to rip metal particles off the edges. Just because metal is rough from punching or forming doesn't mean it's going to tear off at the slightest force put on it. Some people have wild concepts.

 

[Imp4]

Originally Posted by shibby6600
Just a hunch, but I bet the hole design/shape/flow characteristics was given zero thought. The engineers designed a machine to efficiently make holes in a sheet of metal, rolled across a plate/conveyor. Instead of punching a clean hole, it's probably a toothed wheel rolled over the metal sheet so they can manufacture these quickly, and leaves zero waste behind (versus a punched hole).

Um.... No....

Originally Posted by shibby6600
Everyone's getting a little overboard with how these are bad, flow data, etc., but until there is data of any filter with this design causing a failure (or at the very least increased UOA levels) everything is hearsay.

Yes, definitely yes.

 

[ZeeOSix]

Originally Posted by Imp4
Originally Posted by shibby6600
Everyone's getting a little overboard with how these are bad, flow data, etc., but until there is data of any filter with this design causing a failure (or at the very least increased UOA levels) everything is hearsay.

Yes, definitely yes.


Keep in mind that if the louvers are ill formed so they are almost closed like in the examples I showed earlier, that the filter bypass valve will open up and still provide oil flow to the engine ... but it will be unfiltered oil. Any engine will still run (and not explode) with unfiltered oil. But if there's some small amount of added wear because of the bypass valve being open most of the time then you'll most likely never know it. At any rate, I doubt anyone would feel good about unfiltered oil getting by the media most of the time.

Still a good reason to ensure the louvers are well formed and opened up to provide good flow and a low delta-p across the filter so the bypass valve doesn't operate unnecessarily.