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Old 09-26-2017, 04:25 PM   #1
Oleg B
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Default Bypass oil filter: pros & cons

Hello Suba fans,
What do you think about topic?
Please mark your comments as "Pros" or "Cons"
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Old 09-26-2017, 04:31 PM   #2
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Your car already does this automatically when giving higher percentages of throttle.
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Old 09-26-2017, 04:53 PM   #3
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What possible "pro" could there be for not filtering the oil?

Although yes, there is a bypass, in the filter. When the oil pressure across the filter is high enough (20-30psi) it opens. That's not engine oil pressure, but the pressure from one side of the media to the other. This probably occurs on cold starts especially with a higher viscosity oil, and after the filter has been on for awhile.
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Old 09-26-2017, 05:53 PM   #4
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He is probably asking about an additional filter system (bypass the stock system) that has much better filtering than the stock system. The pro I see is better filtering, con being expense, and extra plumbing / failure points down the road.

http://www.amsoil.com/shop/by-produc...?code=BMK23-EA

http://www.amsoil.com/lit/databulletins/g2552.pdf
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Old 09-27-2017, 02:06 AM   #5
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Quote:
Originally Posted by cnstman View Post
He is probably asking about an additional filter system (bypass the stock system) that has much better filtering than the stock system. The pro I see is better filtering, con being expense, and extra plumbing / failure points down the road.

http://www.amsoil.com/shop/by-produc...?code=BMK23-EA

http://www.amsoil.com/lit/databulletins/g2552.pdf
Yes, exactly.
How-it-works
Strange, that such systems are not popular in Suba world.
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Old 09-27-2017, 07:58 AM   #6
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Default Bypass oil filter: pros & cons

This is probably the most detailed thread about installing a bypass system in a Subaru I've seen. I haven't checked lately but the OP was running fairly thin Amsoil SSO 0W30 at 15,000 mile intervals in his Legacy GT and also gained two quarts additional capacity.

Have fun!

http://legacygt.com/forums/showthrea...ons-81741.html
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Old 09-27-2017, 09:08 PM   #7
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In their terrible diagram, how do they restrict the oil pressure drop from the filter teeing into the oil system?

I'm familiar with this from diesel truck things, where they are inline (but parallel) with the system. It allows it to passively clean the oil.
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Old 09-28-2017, 08:53 AM   #8
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Im interested in the idea....
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Old 10-09-2017, 09:55 AM   #9
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Recently I had Manley H-Beam connecting rod broken in my Forester, so the engine built is in progress.
Config will be similar to my previous engine (Darton sleeves, JE pistons, nitride treated crank) + Manley I-Beam rods, APS DR-65 BB turbo (Garret 3582 CHRA), Kelford 272, Manley valves/springs/retainers, 12 mm oil pump, etc.
I bought Frantz Bypass filter with Frantz Synthetic Filter Media and will try to install it (as minimum planning to keep it for break in period).
Regarding pressure drop: Frantz bypass filter has input orifice of 0.9 mm and output orifice of 0.4 mm, so pressure drop should be not an issue with 12 mm oil pump, however, I have oil pressure Defi sensor in the gallery plug and can monitor oil pressures after install.
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Old 11-05-2017, 08:46 PM   #10
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Quote:
Originally Posted by Oleg B View Post
Recently I had Manley H-Beam connecting rod broken in my Forester, so the engine built is in progress.
Config will be similar to my previous engine (Darton sleeves, JE pistons, nitride treated crank) + Manley I-Beam rods, APS DR-65 BB turbo (Garret 3582 CHRA), Kelford 272, Manley valves/springs/retainers, 12 mm oil pump, etc.
I bought Frantz Bypass filter with Frantz Synthetic Filter Media and will try to install it (as minimum planning to keep it for break in period).
Regarding pressure drop: Frantz bypass filter has input orifice of 0.9 mm and output orifice of 0.4 mm, so pressure drop should be not an issue with 12 mm oil pump, however, I have oil pressure Defi sensor in the gallery plug and can monitor oil pressures after install.
Finally installed Frantz bypass oil filter in my Subaru Forester:



















Last edited by Oleg B; 11-06-2017 at 03:37 AM.
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Old 11-05-2017, 08:47 PM   #11
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Old 11-07-2017, 07:31 AM   #12
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Where da pics at?
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Old 11-07-2017, 11:33 AM   #13
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Ron, I see all the pics.
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Old 11-07-2017, 12:52 PM   #14
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Anybody else can't see the pictures? Please let me know.

@Unabomber, I uploaded them and even some more to Google Drive (no registration required for view and/or "download all"): Bypass oil filter installed (Oleg B)

Last edited by Oleg B; 11-07-2017 at 01:01 PM.
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Old 11-07-2017, 03:38 PM   #15
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I hate photobucket. The forums are now jacked because of them.

Does anyone else have a good pic server option?
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Old 11-07-2017, 04:24 PM   #16
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CON

Unnecessary cost and complexity (increased probability for issues).

The OEM filters go down to 5 microns. My personal opinion is the difference between 2 and 5 microns in regards to a Subaru oiling system, performance, and longevity are meaningless. If there were ever evidence of small particulate issues on these engines, I'd be fully on board with your cause. I just don't see a measurable benefit.

Although, I am definitely in to be proven wrong with a back-to-back oil analysis
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Old 11-07-2017, 06:18 PM   #17
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Quote:
Originally Posted by KillerBMotorsport View Post
CON
...The OEM filters go down to 5 microns.
Do you have any proof of this info?
Which Beta Ratio/Efficiency do you mean?
The best Beta Ratio (declared by manufacturer) which I found was for reusable Pure Power 8415, K&N SS-1008, K&N-SS1004 and K&N SS-1010 - 100% @ 22 microns.
Purolator PSL14612 - 99.0% @ 25 microns
K&P Engineering S1 - 100% @ 35 microns
Purolator Pureone PL14612 - 99.9% @ 40 microns
Source: Subaru oil filter comparison
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Old 11-10-2017, 05:02 PM   #18
Oleg B
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Quote:
Originally Posted by KillerBMotorsport View Post
CON
The OEM filters go down to 5 microns.
Do you have any proof of this info???

Last edited by Oleg B; 11-10-2017 at 05:24 PM.
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Old 11-10-2017, 09:12 PM   #19
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Quote:
Originally Posted by Oleg B View Post
Do you have any proof of this info???
Proof of a phone conversation with someone in the know? No. I have several pages in my engineering notepad detailing specs from conversations with several manufacturers. SAE data as well. You being a spectator of the internet don't have to believe a word of it. I have no dog in this fight as we're not profiting from OEM filter sales, but our reputation is based on at least giving somewhat decent knowledgeable advice.
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Old 11-10-2017, 11:47 PM   #20
Oleg B
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Quote:
Originally Posted by KillerBMotorsport View Post
Proof of a phone conversation with someone in the know? No. I have several pages in my engineering notepad detailing specs from conversations with several manufacturers. SAE data as well. You being a spectator of the internet don't have to believe a word of it. I have no dog in this fight as we're not profiting from OEM filter sales, but our reputation is based on at least giving somewhat decent knowledgeable advice.
What is Beta Rating/Efficiency of OEM filtering to 5 microns?
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