Specs for wix bypass filter / Amsoil Eabp

[dukeisok]

I have three vehicles with Amsoil bypass filters, all for different reasons.

I went to buy new EaBP filters from Amsoil and they are all on extended backorder.

Amsoil recommends using a Wix WL11042 filter.

Amsoil doesn't have any filtration specs that they will share, and Wix doesn't either (I called both). The Wix website lists this as a filter made specifically for Amsoil bypass systems and gives no more info. The filters are cheaper than eabp filters, and rock auto has them for $34.

I suspect they don't reach the 2 micron rating of an EaBP filter. In my searching, I found some eabp filters at a lawnmower supply place (apparently dixie choppers used them from the factory and lists them as their part 60119, though for $100 each

I'm sure I am worrying about nothing, but I would prefer to have the amsoil level of filtration. Getting a filter for 1/3 the price is appealing though.

At this point I'll probably run the filters I have until they stop up, then see if Amsoil then has stock.

Any other thoughts?

 

[BobsArmory]

I can't say but the wix and amsoil filters maybe be the same thing just with different paint on the outside.

 

[dukeisok]

that was my initial thought, but Amsoil specifically will not confirm that these meet the same specs and they don’t look identical online. Wix doesn't offer three separate sizes either. there’s probably no way to know given the secrecy around supplier agreements.

 

[Dutchy491]

For $34 each I’d suggest buy 3. Especially in today’s craziness. Likely better than running the EABP filters until they’re plugged solid. Run them a little longer, sure, but how would you know when they’re plugged?
Cut them open and compare as you replace them…

 

[dukeisok]

My assumption was that bypass filters become more effective as they fill up with particulates. When they finally plug, they no longer get hot as oil is no longer entering the filter. Then you just have the primary filter, which I change on schedule anyway. I suppose I could rig up a temp gauge on the bypass base, or more likely just put a hand on it every time I fill up with fuel.

 

[kschachn]

My assumption was that bypass filters become more effective as they fill up with particulates. When they finally plug, they no longer get hot as oil is no longer entering the filter. Then you just have the primary filter, which I change on schedule anyway. I suppose I could rig up a temp gauge on the bypass base, or more likely just put a hand on it every time I fill up with fuel.

@ZeeOSix

 

[ZeeOSix]

^^^ Hard to say without some ISO testing if a super high efficiency bypass filter loses efficiency as it loads up. Reason I say that is because they are relatively large in size, and the flow volume rate through them is pretty low compared to a full flow filter. The large media area and small flow rate may make them act more like an air filter as they load up. I'd like to see some official efficiency testing on some of them. We know per ISO 4548-12 efficiency testing that full flow oil filters do lose efficiency as they load up. If the oil flow volume through them was a trickle, they might show a different reaction.

 

[dukeisok]

That is odd to me. I would think that the particulate loading in a filter without a pressure relief bypass would actually increase efficiency as the captured particiulates themselves add to a matrix that blocks flow of additional particulates. I wonder if the loss of effeciency for full flow filter is due to increased flow through a pressure relief bypass due to increased pressure differential across a full filter. By the same token, a bypass filter that is getting full may filter the oil that comes through it more completely, but less oil comes through it due to increasing resistance? My truck is a chevy 3.0 LZO that uses an electrically controlled belt driven oil pump and gas an in-block bypass for the full flow filter. It keeps the pressure low at interstate speeds, 18 psi or so on 0w20 oil at 1700 rpm. The pump ramps up quickly to 30-40 psi if you accelerate or put it in tow-haul mode. That isn't much pressure to drive filtration thru a bypass. Regardless, it's all a theoretical mental exercise at this point

Amsoil said they don't have lead time but are hoping for a month or two. I can probably just wait.

 

[ZeeOSix]

That is odd to me. I would think that the particulate loading in a filter without a pressure relief bypass would actually increase efficiency as the captured particiulates themselves add to a matrix that blocks flow of additional particulates. I wonder if the loss of effeciency for full flow filter is due to increased flow through a pressure relief bypass due to increased pressure differential across a full filter.

No, the loss in efficiency of a full flow filter is due to the media not being able to retain all the captured debris. Oil filters do not behave like air filters as they load up with debris. The oil flow velocity through the media makes debris shed and go downstream which is why the efficiency decreases. The more the filter is loaded, the higher the shedding rate. It's seen in the ISO 4548-12 test and has been discussed in many threads in this forum.

Read this post and beyond.

D

Post in thread 'Would you all like to see ISO 4548-12 Oil Filter Lab Testing Comparison, Efficiency & Capacity, Pressure vs Flow, Bubble Point, and Burst?'

Jun 4, 2021

Interestin

Yes, a pre Determined DeltaP determines the end of the test. In our case I choose 8PSID over clean assembly. For the ISO 4548-12 multipass test the average of readings taken every X seconds over a 5 min or 10 min time interval are averaged and reported depending on how long the test takes to reach that Terminal DeltaP.

What you see here in the previous graphs is an average taken from each time interval reading the entire time of the test and averaged. You can look at each time interval and see how it changes over time.
Here is an example of the AC-Delco time interval report...

• Davejam

• 

Here's more ISO 4548-12 testing where all of these spin-on filters lost efficiency as they loaded up. Some pretty badly. Below the link is a summary of a couple to show what the efficiency was new and at the end when they were loaded pretty good.

https://www.kitplanes.com/oil-filter-testing/

By the same token, a bypass filter that is getting full may filter the oil that comes through it more completely, but less oil comes through it due to increasing resistance?

Yes, like I mentioned above if the flow rate through the bypass oil filter is very low then it may not lose any efficiency ... only an ISO test would show what it does as it loads up. But plenty of ISO data shows normal full-flow filters lose efficiency, some pretty badly. Keep in mind that the ISO efficiency test is the average efficiency from new to nearly loaded, so a filter with a high ISO efficiency doesn't shed much debris as is loads up. An oil filter with a low ISO efficiency is going to be a bigger debris shedder than one with a much higher ISO efficiency.

My truck is a chevy 3.0 LZO that uses an electrically controlled belt driven oil pump and gas an in-block bypass for the full flow filter. It keeps the pressure low at interstate speeds, 18 psi or so on 0w20 oil at 1700 rpm. The pump ramps up quickly to 30-40 psi if you accelerate or put it in tow-haul mode. That isn't much pressure to drive filtration thru a bypass. Regardless, it's all a theoretical mental exercise at this point

The fact that oil filters can lose efficiency isn't theoretical ... it's proven by testing.

 

[oil pan 4]

I have three vehicles with Amsoil bypass filters, all for different reasons.

I went to buy new EaBP filters from Amsoil and they are all on extended backorder.

Amsoil recommends using a Wix WL11042 filter.

Amsoil doesn't have any filtration specs that they will share, and Wix doesn't either (I called both). The Wix website lists this as a filter made specifically for Amsoil bypass systems and gives no more info. The filters are cheaper than eabp filters, and rock auto has them for $34.

I suspect they don't reach the 2 micron rating of an EaBP filter. In my searching, I found some eabp filters at a lawnmower supply place (apparently dixie choppers used them from the factory and lists them as their part 60119, though for $100 each

I'm sure I am worrying about nothing, but I would prefer to have the amsoil level of filtration. Getting a filter for 1/3 the price is appealing though.

At this point I'll probably run the filters I have until they stop up, then see if Amsoil then has stock.

Any other thoughts?

If it's not 2 micron or less it's a waste of time. Most of the particles I observe in clean oil under a microscope are 1 and 2 micron.
As it turns out just running a decent oil filter cleans the oil really well.
If it's not a nano filter I wouldn't bother.