Mann group buys WIX

[Sayjac]

Quote:
...The Chinese can build stuff to any quality from excellent to terrible, and to any rating....

My post expressed no specific concern about build quality, it was about not having published ISO efficiency rating for those that prioritize it in a filter. And while I have little doubt they 'could' build to an ISO efficiency rating, as a rule haven't seen that done in those posted here. Otoh, some made in S Korea spin on filters, do have such a rating.

More importantly though, with the multiple readily available spin on filters at reasonable prices made here, no reason 'for me' to chase the made in China spin on filters.

That said, what others choose to use is their choice and fwiw, ok with me.

 

[ZeeOSix]

Originally Posted By: Sayjac
Quote:
Thats ok if they have to do that to slow the flow and stop the tearing its fine with me because i dont use them anymore.....

I wasn't aware that the topic filter, Wix had tear issues, hadn't seen them posted. Or even that it's proven yet they have gone to the louvered design across the line.

As for the "slow the flow" assumption, not what louvered filter maker Clacor Hastings says in their literature. Says "Louvered Centertube adds strength to resist pressure surges. The louvered design has 40% open area compared to the standard 15%, maximizing flow through, while maintaining strength."


I don't think I've ever seen a metal center tube with the standard round holes have any strength issues (ie, imploded tubes). I'm thinking the reason some manufacturers are going to the louvered center tube is because it may be stronger (or just as strong) while using less/thinner material per center tube (ie, material cost cutting). Plus a louvered design seems like it would be easier to manufacture (no waste hole punches to control).

And "if" the louvers are bent open well, then I can see that there would be an increase in total flow area, and a better flow distribution through the media. All positive traits "if" they are manufactured correctly (ie, opened more than the thickness of a piece of paper). It almost seems like there are growing pains with the louvers for some manufacturers like there was for the eCore plastic center tubes.

 

[Sayjac]

Originally Posted By: ZeeOSix
....I don't think I've ever seen a metal center tube with the standard round holes have any strength issues (ie, imploded tubes....

I haven't either. However, response was specifically to the assertion/implication was that louvered center tube design was 'strictly' to "slow the flow". Entire Hastings quote included to provide proper context for the reply.

Beyond that could be Hastings marketing, but their statement would appear to counter the "slow the flow" assertion.

 

[AuthorEditor]

Quote:
I don't think I've ever seen a metal center tube with the standard round holes have any strength issues (ie, imploded tubes).

Would never happen if there was a functioning bypass valve. In other words, if the holes were too small you might never know since the bypass would just open all the time.

 

[ZeeOSix]

Originally Posted By: Sayjac
Originally Posted By: ZeeOSix
....I don't think I've ever seen a metal center tube with the standard round holes have any strength issues (ie, imploded tubes....

I haven't either. However, response was specifically to the assertion/implication was that louvered center tube design was 'strictly' to "slow the flow". Entire Hastings quote included to provide proper context for the reply.

Beyond that could be Hastings marketing, but their statement would appear to counter the "slow the flow" assertion.


Theoretically, if there are way more louvers/slits in the center tube to make up more total flow area, then that would mean the flow is split up and distributed more evenly over the area of the center tube. It would also mean the velocity of the flow through each louver would be slower than if going through many less of larger holes in a center tube. So overall, the flow velocity through the center tube would indeed be 'slowed down' if the flow volume was the same in both cases.

 

[ZeeOSix]

Originally Posted By: AuthorEditor
Quote:
I don't think I've ever seen a metal center tube with the standard round holes have any strength issues (ie, imploded tubes).

Would never happen if there was a functioning bypass valve. In other words, if the holes were too small you might never know since the bypass would just open all the time.


Agreed ... good point.