Originally Posted By: ZeeOSix
Originally Posted By: crazyoildude
How can the new Boss flow so well with those small oil holes on the center tube?
As long as the louver slits are bent open pretty good, I doubt the center tube design restricts any flow. There are so many slits that the total area would be well above what's needed.
But, there were a couple of photos of a louvered center tube where the slits were barely opened up, so I'd be leery of that if the slit openings were paper thin.
If they are nearly closed it is an issue. That seems pretty clear. I had a filter I returned to WM that they were almost all closed. Otherwise here is Hastings take on the louvers, they claim more flow than average:
http://www.hastingsfilter.com/ProductsLubeLF115Detail.html
I sure like their dual flow heavy duty filters maybe we car owners will start getting them some day.
The other question I have, for Jay, is what measures do they take to make sure no burr material is on the inside of the center tube? I do see the Frams have quite a bit of burring around the center tube holes. Their own Champ Labs e core filter description make a point of increased cleanliness due to the nylon core tube, so being immersed in the details of oil filter construction, I think it is a fair question to ask.