How do you know? You don't without a sophisticated fluid dynamics flow model and the results of that flow model. Even if it did improve the flow "distribution" field some, it's not going to make the filter perform any better in terms of making the oil go through the media. It all goes through the media one way or the other - it's naturally always looking for the path of lease flow resistance. And the oil flow field will naturally distribute regardless of the holes it goes through in the base plate. Look at the OG Ultra that Ascent tested. It has relatively "small" base plate holes (and also relatively "small" holes in the center tube, but a lot of them) and it still smoked the competition in the ISO 4548-12 efficiency test. And it's overall dP vs flow was right there with the best of any other in that test. Those "small" base plate holes worked just fine.I wasn’t talking about baseplate pressure changes. The oil is dispersed more evenly and directed at the pleats more square on with slots or oval holes or plenty of any shaped holes. Much better imo.
BTW - you do realize that the flow also has to go around the ADBV, which is never fully out of the way in operation. That resulting change in flow direction will disrupt the flow field coming through the holes, so another reason the shape of the holes really isn't that important.
Well yeah ... that's what I said before. It won't make much if any difference in dP vs flow across the base plate unless there's actually more flow area in the holes.There are so many fittings and pressure changes in an engine, base plate change in pressure isn’t going to be one they worry about. In fact many oil filters meet the base plate spec, all of them actually. It only needs total holes to be bigger than the outlet pipe and there is no problem.
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