There are a few things to gain from a larger filter:
1) consolidation of filter stock
2) more capacity for cooling
3) more capacity for holding contamination
4) greater efficiency from slower volumetric flow
I can see some context of hope for the first issue; it may make things easier. But just how many filters does one really have, and is one so limited for space that a few "correct" filters would make the seams of your garage or storage shed literally burst open? The convenience of a few less filters is minor, when you really look at reality.
As for cooling, I would agree it helps. It helps to such an infitessimally small degree that you could NEVER, EVER hope to prove it in reality. I don't care about your theory; SHOW ME the PROOF that this actually happens. Remember, most always we're talking about liquid cooled, thermostatically controlled engine temps here ... And by the way, that "extra" cooling in summer is actually working against your warm up in winter, however super-duper tiny small it really is. So someone please post up the actual temp data from several successive trials, along with your averages and standard deviation norms, so that we can actually believe a can that hold perhaps 10% more is really that efficient in cooling down your entire lube system. And make sure to discuss your ANOVA points and show conclusively that you can manipulate the temp of the system to a level larger than all the other inputs such as thermostat, ambient temps, dirt cake, etc ...
As for holding capacity, I'll ask to see anyone's proof that the current state (OEM properly spec'd filter) is actually going into bypass with regularity, indicating that the OEM filter design is maxed at capacity for your FCI duration. SHOW ME the DATA that you can conclusively indicate that the OEM filter is overwhelmed to a point where the media is blinding off, or even close to doing so at the end of your FCI. Please post up your dP tracking observations where the bypass is clearly going into relief. To the best of my knowledge, the only member here that ever had real-world data to this effect is Jim Allen, and he's shown filters essentially NEVER go into bypass but under uber-cold, high rpm bursts and once the oil warms up, the media dP is only a few psi. Additionally, if capacity is your concern, how is it that top-tier products (high-capacity cellulose/syn blend and full syn media) don't offer enough capacity in the RARE event that you actually could blind off the media of a "regular" filter. Somehow, a "bigger" filter would hold the extra dirt, but the added capacity of the properly sized FU won't???? You would have to essentially double the size of the filter, because the FU holds 2x more than typical filter application. I have run "normal" filters to 10k and 15k miles, and the media was still in excellent shape and not coated to a bypass condition. So I ask, just how far are you pushing the OEM spec'd filter, really and can you PROVE what you claim?
As for efficiency, you will likely gain some by slowing the lube flow through the media. Probably roughly on par with the %shift in flow? So perhaps at 2,000 rpm, you might be able to slow the surface flow from 3.0000000 gpm to 2.99999999 gpm for each square inch of media????? I have no idea what the actual figures are, but I'm confident that they are really paltry. Really, really stupidly low, in terms of efficiency shift. It's more likely to see a dE %shift from product to product than that of flow variance.
And don't forget this ...
the downside is that no filter maker I'm aware of will warrant your home-grown choice of "non-stock" application. First, you have to understand how the FTC limited warranty provisions work. Then, you'd understand that the burden of proof shifts from the filter maker to YOU, and you have a LONG, HARD, EXPENSIVE road ahead of you to prove that your selection was "better" against all their data, engineers and lawyers in the arbitration hearing or small claims court. It is correct to say that the OEM cannot deny warranty, should their product be proven to be the root cause of failure. But it is also correct to say that once you stray off the reservation, they have the right to defer any payout until YOU can PROVE that YOUR SELECTION was sound. You and your hunch against their reams of data and team of experts. Good luck with that.
So, by all means, go ahead. You'll sleep better knowing a bigger filter is on there, despite there is no credible evidence that such small changes actually amount to any tangible gain, and that you are able to slay the corporate dragon with complete assurance, should the unthinkable happen.
But if you want to convince me, I'm a data driven person.
I'll bow to your concern for garage stock; I cannot hope to assuage you of the concern for too many filters on your shelf.
But when it comes to cooling, capacity and efficiency, puh-leeeeezeeee show me the data that any of this actually manifests into reality. Show me your temp data tracking, your UOA evidence and your PC analysis that clearly indicates the logic to the quest. I don't what to hear theory; I've got that covered. Shoe me PROOF it makes a difference.
Show me that the risks, however remote, are usurped by the rewards.
Please, show me, anyone.
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