Oil filters have had center tubes with holes for decades. Louvers aren't adding anything worth mentioining performance wise. It's an easier way to made center tubes with no waste - ie, no punched hole scrap metal to deal with.
What about these louvers?
- Thread starter Freischneider
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These louvers are perfectly fine. People are going overboard nuts on this.
Why? There is nothing wrong with your filter man.
I believe these are sheet metal on rolls to start, the louvers are formed then spiraled into coils to the proper diameter and cut to length. The ends of the new tubes are shaped and in this process OR when the ID metal endcap portion is pressed on - there is some contact with the end rows. Perfectly normal and again there is plenty of ability to flow.
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- Jul 19, 2021
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Okay thanks. I just don't get I warm and fuzzy feeling about these louvers.
Why not? Warm and fuzzy? I think we found the problem!
- Joined
- Jul 19, 2021
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I should have done my homework and researched if it had louvers before I purchased it. I just prefer holes or the E-Core design. There's been a lot of wailing and gnashing of teeth about the louvers and I guess I'm caught up in the hysteria haha.Why not? Warm and fuzzy? I think we found the problem!
You are not being logical, and you are trying to make sense. This just doesn't work for critical thinking and solid, precise and accurate decision making in tribology and things mechanical.
Good luck. Choose what you want.
Science. It's not what is was prior to 2020.
Like said earlier, it's a visually subjective inspection, and people need to calibrate their louver reading ability. It's becoming a fine art, lol.
I see nothing wrong with people posting photos and asking what others' take is on their "louver read". If filter makers weren't all over the map and just made them right all the time, then there wouldn't be all this concern in the first place. It would be like looking at a center tube with all kinds of barely opened or half punched through holes, or missing half the holes. People would be concerned about that too.
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I would venture that even if ten percent of the louvers were inadequate the flow through the rest would equal a center tube with holes.
It would be interesting to measure all the louver openings and see how that compares to the holes.
I've done it on a louvered filter once ... very tedious work.
Thanks! The whole batch is like this. I'm just worried that in the dead of winter these may cause lots of by-pass events.
If you want some tedious analysis, count up the total number of louvers and the avg opening area. Then measure the inside dia of the threaded base outlet hole and reduce it to ~70% to account for the mount spud wall thickness. Then compare the total flow area of the louvers to the total flow area of the base outlet hole. Isthe louver total flow area equal to or greater than the base outlet hole?
Don't forget when you look down that hole you're only seeing half the story!
Mopar M0-041 looking solid!
Except for the louver design shown in post #37 (not typical).
If louvers are mere slits on the visible side, they will also be mere slits on the non-visible side.
I guess my experience with a 51040 I posted recently was a bit difference. Sorry for the bad pics, don't have the best phone but I think my point will come thru.
Looking down the hole you can see one row was good the rest no so much.
Torn apart looking the other way they all appear to be good to go.
Hope this helps.
I'm sure it's possible to have some "bad rows", but what I'm saying is if one louver is open when looking down the center tube, then that same exact louver will most likely be open in the other direction.
Bottom line is if I look down the center tube and don't like all the louvers I can see, then it's a reject. I'm not going to assume that if all the louvers I can see looking down the center tube are mere slits, that they are all wide open facing the other way - the chances of that are pretty nill.
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