New Castrol CAS6607 oil filter cut open

[Oil filter fan]

I wanted to see what's inside a Champ made filter and how good it is as couldn't find any useful and detailed info.

A flashlight test. Pretty significant dirty oil leak according to my calculations. It's like having a 5x5 mm hole. I'd guess 1-2% of oil gets past the medium unfiltered.

The ADBV valve doesn't seal well.

The bypass pressure is 1.1 bar.

Thick and strong medium which is unlikely to collapse under pressure but very small amount of 380-390 sq.cm.

Lots of synthetic fibres.

 

[Zee09]

Same as the modern K&N select
Very thin ADBV

 

[ZeeOSix]

A flashlight test. Pretty significant dirty oil leak according to my calculations. It's like having a 5x5 mm hole. I'd guess 1-2% of oil gets past the medium unfiltered.

If the leak gap was really equivalent to a 5x5 mm hole it would leak way more than 1-2%.

 

[Oil filter fan]

The hole is about 0.5% of the total medium surface. It really hard to evaluate how much oil would leak without knowing the coefficients of flow resistance though the medium and through a slot of only 0.3 mm wide. Likely the oil flows a lot easier through an equivalent square hole of 5x5 mm.

 

[ZeeOSix]

The hole is about 0.5% of the total medium surface. It really hard to evaluate how much oil would leak without knowing the coefficients of flow resistance though the medium and through a slot of only 0.3 mm wide. Likely the oil flows a lot easier through an equivalent square hole of 5x5 mm.

Some pretty in depth analysis was done on this filter in the link below (look at post #1 in that thread) that had two 0.75" x 0.020" gaps which equals 0.03 sq-in (19.4 mm^2). That one calculated out to leak 16% of the flow. Yes, the open gaps will flow much easier than the media, therefore it will flow more than most people think. Flow needs to be modeled and calculated, super hard to judge flow by looking at things like gaps, orifices, etc.

This is a big wild thread about leak gaps, etc. It jumps to the post about how the leakage percentage was modeled.

Post in thread 'Fram Endurance Flashlight Test in canister'

Sep 8, 2024

The rectangular calculation is treating it as a section of pipe, not an orifice, and does not account for the constriction entering the narrow slot and the expansion leaving the narrow slot (i.e. what an orifice actually experiences). If the online calculator cannot do a rectangular orifice, for a correct comparison, do the round orifice as a single piece of pipe, not an orifice, and see what that says.

After digging some more, I agree that the on-line flow/dP calculator for the square pipe isn't accounting for entrance and exit effects like with an orifice. It's just calculating...

• ZeeOSix

• 

 

[GW.]

Champ Labs made which is now out of business. Typical bad QC with internal leak.

 

[Fair enough]

Not that it matters on filters that may no longer be made, but the black dot in the gap is the side protrusion on the spring that lifts up the spring where it bends out a little. Gap is worse than just ruffles. Just a badly designed leaf spring on these, not designed by someone with experience in basic mechanical things.
Toyota Denso has the leak issue too which is surprising, not the protrusion but the seal is not perfect.

 

[Sayjac]

Basically it's the now discontinued SuperTech MP series filter, or Champ Labs made STP XL in regions where AZ stores sell those. It's too bad about the seal area leak, because otherwise a decent looking element. Fwiw, last MP 7317 I c&p off neighbor's Civic had same seal area finding. As Champ Labs now going bye bye, thinking Castrol will be looking for another supplier.

Thanks for c&p.

 

[JohnnyJohnson]

Data says 99%+ direct removal efficiency at particles larger than 20 microns so it does not filter at the 20-micron level. 22.49 each on Amazon.

 

[ZeeOSix]

Data says 99%+ direct removal efficiency at particles larger than 20 microns so it does not filter at the 20-micron level.

A particle that's 20.001u is larger than 20u, so when a spec is written that way it essentially means at 20u and larger.

 

[Oil filter fan]

I tried to evaluate how much oil gets bypassed under different conditions and in the worst case scenario when the medium is totally blocked/loaded with the dust. First I tried to calculate myself. The result I got was suspicious. I checked again and again. Then I tried the Pressure drop online calculator. To my surprise I got the same number: if the delta P across the medium equals to the bypass setting of 1.12 bar than the flow though the gap is 38 l/min. This means that you never need a bypass valve because the oil pump cannot pump more oil than escapes though the gap. Basically 100% of oil is unfiltered. Of course this the extreme case which will never happen but it's frustrating. I am still a little skeptical but it is what it is.

 

[ZeeOSix]

I tried to evaluate how much oil gets bypassed under different conditions and in the worst case scenario when the medium is totally blocked/loaded with the dust.

That's not a good way to evaluate the internal leak by assuming the media is totally blocked. The gap is going to leak any time there is a dP across the media and the leak gap.. I went through some detailed analysis and explained how it was approached in a few threads, so I'd have to go dig that up again to get the details.

 

[malibuguy79]

Looks like a decent basic filter. What does the flashlight test look like with some actual pressure on the spring?

 

[Oil filter fan]

No pressure on the spring. I doubt that applying pressure would close the gap even by 0.1 mm. The spring is tight inside the cartridge (because of 4 indents on the cylindrical surface) and doesn't move easily.

 

[Oil filter fan]

I tried to do an unscientific test to see what gives higher air flow resistance: either the cylindrical surface or the flat surface. First I assembled the spring and the cartridge in such a way that there was about 0.5-1 mm clearance to the flat surface. The air escaped like there was no resistance at all. Than I pushed the spring part deeper inside the way it came from the factory with some inevitable gap. The air resistance became a few times higher. No doubt the flat surface is supposed to provide the seal. To be honest I thought it was the opposite.

 

[ZeeOSix]

^^^ The flat surface (left arrow pointing to it in photo above) is suppose to be the metal-on-metal "sealing" surface. The protruding "nubs" prevent it from sealing where the right arrow is pointing to because the "nubs" leave a big air gap the size of the distance the "nubs" stick out.

 

[JohnnyJohnson]

Boy are they proud of those little babies $19 and $22 and change on Amazon. Thanks but no thanks.