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#4666246 - 02/14/18 08:48 PM Question about Baldwin Filters
twj348 Offline


Registered: 02/14/18
Posts: 7
Loc: Canada
I'm looking at getting an oversized filter for my Subaru, and I've been looking at Baldwin Filters since they're only filters I can find that more or less match the OEM 23psi bypass rating.

I'm considering filter like the Baldwin B161-S or the Baldwin B1425.

If you look at the links, one of the filters is labelled a "Full Flow Lube Spin-on", and the other is just labelled "Lube Spin on". Is there a difference between these? Is the B1425 meant to be used as a bypass filter instead of a full flow filter?

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#4666286 - 02/14/18 09:40 PM Re: Question about Baldwin Filters [Re: twj348]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17225
Loc: PNW
Both are full flow spin-ons. They wouldn't list specific vehicle brand/makes that don't incorporate a by-pass filter if it was meant to be a by-pass filter.

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#4666296 - 02/14/18 09:49 PM Re: Question about Baldwin Filters [Re: twj348]
dave123 Offline


Registered: 01/13/09
Posts: 2265
Loc: wi
Seriously what's wrong with OEM.

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#4666339 - 02/14/18 10:46 PM Re: Question about Baldwin Filters [Re: twj348]
Linctex Offline


Registered: 12/31/16
Posts: 5724
Loc: Waco, TX
Originally Posted By: twj348
I'm looking at getting an oversized filter for my Subaru,


I think the Fram XG7317 is the one you want.
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#4666507 - 02/15/18 07:57 AM Re: Question about Baldwin Filters [Re: dave123]
Gebo Offline


Registered: 09/18/02
Posts: 1991
Loc: VA
Originally Posted By: dave123
Seriously what's wrong with OEM.


Hmmm..what is wrong with OEM? Just trying to find something that may be better?
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#4666514 - 02/15/18 08:07 AM Re: Question about Baldwin Filters [Re: Linctex]
twj348 Offline


Registered: 02/14/18
Posts: 7
Loc: Canada
Originally Posted By: Linctex
Originally Posted By: twj348
I'm looking at getting an oversized filter for my Subaru,


I think the Fram XG7317 is the one you want.


I like the Fram Ultras, but this one has a 13psi bypass. Subaru specs 23psi. Since it is a bit larger than stock, that somewhat compensates for the lower bypass pressure setting, but it'll still be in bypass more often than the stock filter. One of the reasons I want a larger filter is so that the filter isn't in bypass as often. I live in a cold climate and take a lot of short trips with a cold engine, so I think this is kind of important.

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#4666526 - 02/15/18 08:14 AM Re: Question about Baldwin Filters [Re: Gebo]
twj348 Offline


Registered: 02/14/18
Posts: 7
Loc: Canada
Originally Posted By: Gebo
Originally Posted By: dave123
Seriously what's wrong with OEM.


Hmmm..what is wrong with OEM? Just trying to find something that may be better?


The OEM filter is fine, I just like to tinker with things, for better or worse. In theory, a larger filter won't be in bypass as often (can be important for short trips in cold weather), and won't have to be changed as often (I'm considering changing it every second oil change, 6000km OCIs). Supposedly the OEM Subaru filters have gone down in quality since they started being produced by Fram, but I haven't seen any data or specs to support this claim.

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#4666547 - 02/15/18 08:36 AM Re: Question about Baldwin Filters [Re: twj348]
goodtimes Offline


Registered: 12/08/10
Posts: 2671
Loc: california
The Subaru filters are the ones designed specifically for their cars special needs. The others work on a lot of others that have various specs. I had qc issues with Baldwin B37 size. The center tube was cut short with a ragged edge exposed inside the filter, and the opening for the adbv space was only about 1mm for flow. The flow was probably ok but I don't like tinkering that much. So I wasted $11 on two filters I won't use.

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#4667435 - 02/16/18 06:30 AM Re: Question about Baldwin Filters [Re: twj348]
xtell Offline


Registered: 12/13/06
Posts: 506
Loc: ohio
A filter will go into bypass due to very thick oil, very high pressure, etc. The size of a filter has nothing to do with when it will go into bypass.

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#4667652 - 02/16/18 09:56 AM Re: Question about Baldwin Filters [Re: xtell]
bullwinkle Offline


Registered: 10/09/04
Posts: 7486
Loc: Cincinnati, OH, USA
Originally Posted By: xtell
A filter will go into bypass due to very thick oil, very high pressure, etc. The size of a filter has nothing to do with when it will go into bypass.
I disagree-more media surface area means more space, to squeeze more oil through, and even catch more dirt! A bigger filter would definitely go into bypass less often.
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#4667805 - 02/16/18 12:10 PM Re: Question about Baldwin Filters [Re: bullwinkle]
twj348 Offline


Registered: 02/14/18
Posts: 7
Loc: Canada
Originally Posted By: bullwinkle
Originally Posted By: xtell
A filter will go into bypass due to very thick oil, very high pressure, etc. The size of a filter has nothing to do with when it will go into bypass.
I disagree-more media surface area means more space, to squeeze more oil through, and even catch more dirt! A bigger filter would definitely go into bypass less often.


Yes, and aside from the larger media area, the Baldwin filter also seems to have a less restrictive baseplate design (7-hole vs 5-hole), which should give the engine more pressure and flow even when the oil is warm and the filter is not in bypass. My oil pump is a pretty high flow design (17GPM at 6000rpm), so I wouldn't be surprised if there was a large pressure drop across the small OEM filter even with warm oil.

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#4667962 - 02/16/18 03:23 PM Re: Question about Baldwin Filters [Re: xtell]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17225
Loc: PNW
Originally Posted By: xtell
A filter will go into bypass due to very thick oil, very high pressure, etc. The size of a filter has nothing to do with when it will go into bypass.


If you're talking about high engine oil pressure, the filter's bypass valve does not function due to engine oil pressure - only due to the pressure difference across the media. You could have 150 PSI of oil pressure and only 4 PSI of delta-p across the media depending on the oil flow rate, oil viscosity and media flow performance.

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#4667976 - 02/16/18 03:30 PM Re: Question about Baldwin Filters [Re: twj348]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17225
Loc: PNW
Originally Posted By: twj348
... the Baldwin filter also seems to have a less restrictive baseplate design (7-hole vs 5-hole), which should give the engine more pressure and flow even when the oil is warm and the filter is not in bypass.


The base plate and center tube holes don't contribute to much of the total delta-p across the filter. Most of the delta-p (probably ~90% of it) happens across the media. If you do a measurement of all the base plate holes, and all the center tube holes, you'll most likely find their area is more than the area of the ID of the mounting spud the filter spins on to.

Originally Posted By: twj348
My oil pump is a pretty high flow design (17GPM at 6000rpm), so I wouldn't be surprised if there was a large pressure drop across the small OEM filter even with warm oil.


With that much oil flow it will certainly have a higher potential max delta-p since a typical flow vs delta-p curve with hot oil will look similar to the graph below. That's also one reason Subaru OEM filters have a high bypass setting, to ensure the filter doesn't go into bypass due to the high oil flow volume. Keep in mind a filter's bypass valve setting is also determined by the flow characteristics of the filter. In other words, it's possible the Subaru OEM filters are pretty flow restrictive, so Subaru has bumped the bypass valve up to compensate for the expected max delta-p.





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#4668298 - 02/16/18 09:12 PM Re: Question about Baldwin Filters [Re: twj348]
goodtimes Offline


Registered: 12/08/10
Posts: 2671
Loc: california
I am not knocking Baldwin for any reasons, just reporting what I saw on B37. The can is thick, the media thick and plentiful, and a nice bypass valve. But as the picture shows the adbv has a very small space to open, so I wouldn't be so concerned about baseplate holes more than this. I think it is actually enough space to match the inlet holes although doesn't look it. The other defects were center tube cut short(no pic couldn't get it) and a tilted baseplate thread, pictured. The thread is visibly off perpendicular to the baseplate.






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#4668311 - 02/16/18 09:30 PM Re: Question about Baldwin Filters [Re: goodtimes]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17225
Loc: PNW
Dang, not liking the off axis threaded mounting hole. I'd imaging the base gasket would have a hard time sealing once the filter was mounted on the engine.

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