Yes it is. Unfortunately Subaru requires a 27 psi bypass valve pressure. And that is stated in that thread. The cost to replace the engine out weighs the cost of a oil filter.
Oil filter shortage
- Thread starter Bearguy69
- Start date
I haven't yet seen any design changes in the construction quality of the XP/Platinum, only the cellulose filters. That said, they've never been "real nice" as far as being a high-efficiency filter; WIX won't even publish the filtration efficiencies it's so lackluster.
The louvers help create what is known as the Venturi effect allowing for oil to flow through the media at a faster rate. Creating a negative pressure inside the core and the laws of physics happen. Where things of higher pressure migrate to things of lower pressure. And so the theory is better filtered oil at a faster rate.
No, it would be accurate to say that the bypass spring in Subaru's OEM oil filter is set to 1.6 bar or 23.2 psi. This has been an ongoing source of endless speculation since 2009. No one really knows if that bypass spec only applies to the OEM oil filter or to all oil filters so to be able to function as expected on an applicable Subaru engine.
You make a great point. The Tokyo Roki is at 27 psi and the blue fram is at 24 psi so my guess is a psi between 23-27 is what one wants.
A negative pressure?
Yep I
yes the pressure on the intake side of the media is higher than the out flow side of the filter. It’s basic science.
Right just wondering about that whole negative pressure thing. As in -1 psia or something.
Venturi effect - Wikipedia
I have a hard time believing the Venturi effect has any measurable impact in an oil filter, considering that the entire thing is at the same pressure, and there are hundreds of louvers to allow plenty of flow.
Everything I’ve seen about louvers was strictly a cost-savings measure; louvers do not create millions of little steel circles to errantly end up in the filter or be disposed of. Simply punching a slit is more efficient than stamping a hole. Same thing with plastic cages; there’s already plenty of flow, but plastic cages are cheaper than steel tubes regardless if it’s holed or louvered.
I’m from Missouri here- show me a documented test that shows louvers increase velocity thru the media, please. 👍🏻
Everything I’ve seen about louvers was strictly a cost-savings measure; louvers do not create millions of little steel circles to errantly end up in the filter or be disposed of. Simply punching a slit is more efficient than stamping a hole. Same thing with plastic cages; there’s already plenty of flow, but plastic cages are cheaper than steel tubes regardless if it’s holed or louvered.
I’m from Missouri here- show me a documented test that shows louvers increase velocity thru the media, please. 👍🏻
My money is on the "no waste" theory
Yes.Venturi effect - Wikipedia
en.wikipedia.org
The chances of your motor blowing up from incorrect bypass PSI is slim to none. Saying other wise is being over dramatic. Check the specs on what fits and what the bypass is-it's not that great a difference.
Get a Champ XL PH2867XL, for all intents and purposes it is the exact same construction with blended media instead of full synthetic media. 99% @ 20 microns for up to 15,000 miles.
I run a larger Fram FS10575 on my Subaru Crosstrek. It's rated at 16-28psi bypass, even though I feel this whole Subaru bypass rating thing has been way overblown online. The filter media in these filters flow very well and seeing I'm running a larger one with even more filter media it will only reduce the time the bypass valve may be active.
www.fram.com
FRAM TitaniumTM OIL FILTER
FRAM Titanium™ advanced high-flow synthetic oil filters offer ultimate engine protection for up to 20,000 miles. Coated with a rough non-slip textured surface, Total Grip™ allows for easy install and removal. The silicone anti-drain back valve ensures saf
www.fram.com
That is a 22mm filter. Not sure what year you have, but all the ones I know of use a 20mm filter, as being discussed in this thread.I run a larger Fram FS10575 on my Subaru Crosstrek. It's rated at 16-28psi bypass, even though I feel this whole Subaru bypass rating thing has been way overblown online. The filter media in these filters flow very well and seeing I'm running a larger one with even more filter media it will only reduce the time the bypass valve may be active.
FRAM TitaniumTM OIL FILTER
FRAM Titanium™ advanced high-flow synthetic oil filters offer ultimate engine protection for up to 20,000 miles. Coated with a rough non-slip textured surface, Total Grip™ allows for easy install and removal. The silicone anti-drain back valve ensures saf
winner! I was wondering how long it would take. Didn't take long. 🤣 I have an anti-siphon adaptor installed which allows me to use a larger filter.
Not long. Tell me more about this. I assume some sort of standpipe?