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-   -   What's inside that MANN oil filter? Taking it to bits... (http://www.peachparts.com/shopforum/diesel-discussion/349769-whats-inside-mann-oil-filter-taking-bits.html)

Mölyapina 01-12-2014 01:19 AM

Quote:

Originally Posted by mikeyfev1 (Post 3269793)
I don't know why that struck me as so funny, but thanks for that. :D

Sure! It just seemed like the best way to describe it :D.
Quote:

Originally Posted by vstech (Post 3269797)
the pleats are for coarse filtering of the main oil flow, the cotton only gets oil through the tiny bypass orifice. the cotton packing absorbs soot, and lets the oil pass through. it's at very low pressure, and very low volume, but it filters much finer than the paper.

I can understand the cotton totally, I just don't get why it's got dirt in it. That seems counterproductive to me... I don't mean sawdust or twigs, I mean plain ol' dirt (granted there isn't a lot). I'm still going to use the one I have left (broke teenager syndrome), but I don't get why a dirty filter would be better that a clean one (as long as it is very well packed).

tjts1 01-12-2014 09:56 AM

What you call 'dirt' is part of the cotton as it comes off the plant.. In order to separate it out you would also have to separate the cotton fibers which would reduce their density and ability to filter. None of it can get into your oil system and all of it works to filter your oil.

You're freaking out about nothing. Mann is still the best filter you can use.

my123ca 01-12-2014 11:17 AM

Fram cotton is better than mann if thats what the mann cotton looks like.

funola 01-12-2014 11:35 AM

Quote:

Originally Posted by Jooseppi Luna (Post 3269764)
Maybe I'll take apart a MANN fuel filter apart tomorrow.

[EDIT]Looked at it tonight and it looks too tough for me to take it apart. The metal is much thicker. However, upon inspection, it appears that it is filled with that orange cartridge, so at least it's not filled with dirty cotton.[/EDIT]

Didn't you just take apart a MANN filter?

funola 01-12-2014 11:39 AM

Quote:

Originally Posted by vstech (Post 3269797)
the pleats are for coarse filtering of the main oil flow, the cotton only gets oil through the tiny bypass orifice. the cotton packing absorbs soot, and lets the oil pass through. it's at very low pressure, and very low volume, but it filters much finer than the paper.

Is the cotton the bypass filter section? I've read that soot is too small for most oil filters. The only kind that are effective on soot is the toilet paper type bypass filter.

vstech 01-12-2014 12:04 PM

Quote:

Originally Posted by Jooseppi Luna (Post 3269764)
Maybe I'll take apart a MANN fuel filter apart tomorrow.

[EDIT]Looked at it tonight and it looks too tough for me to take it apart. The metal is much thicker. However, upon inspection, it appears that it is filled with that orange cartridge, so at least it's not filled with dirty cotton.[/EDIT]


Quote:

Originally Posted by funola (Post 3269892)
Didn't you just take apart a MANN filter?

notice the highlighted word...

vstech 01-12-2014 12:06 PM

Quote:

Originally Posted by funola (Post 3269895)
Is the cotton the bypass filter section? I've read that soot is too small for most oil filters. The only kind that are effective on soot is the toilet paper type bypass filter.

yes, the cotton is the "bypass" section... it is more effective than the paper is.

funola 01-12-2014 12:12 PM

Quote:

Originally Posted by vstech (Post 3269906)
yes, the cotton is the "bypass" section... it is more effective than the paper is.

So the filters without the bypass cotton section like the Wix (100% pleated?) is less effective?

gsxr 01-12-2014 12:14 PM

Quote:

Originally Posted by my123ca (Post 3269882)
Fram cotton is better than mann if thats what the mann cotton looks like.

Fram is notorious for making some of the worst spin-on filters on the market. I would never use a Fram filter on any of my cars. Period.

The larger top section of the filter which is filled with cotton is the primary filtration, or "bypass"... the FSM refers to this as "finely filtered oil" which goes back to the oil pan. The lower pleated section of the filter is the "full-flow" section, this goes out to the main oil gallery in the engine block. See FSM Group 18 for details.

http://www.w124performance.com/image...iagram_60x.jpg

gsxr 01-12-2014 12:15 PM

Quote:

Originally Posted by funola (Post 3269910)
So the filters without the bypass cotton section like the Wix (100% pleated?) is less effective?

Yes.

:boat:

OM617YOTA 01-12-2014 12:29 PM

Quote:

Originally Posted by tjts1 (Post 3269861)
What you call 'dirt' is part of the cotton as it comes off the plant.. In order to separate it out you would also have to separate the cotton fibers which would reduce their density and ability to filter. None of it can get into your oil system and all of it works to filter your oil.

You're freaking out about nothing. Mann is still the best filter you can use.

Did you even look at the pictures? The cotton field mowing aren't even sealed into the filter. There is a direct path for dirt to get into your engine.

gsxr 01-12-2014 12:48 PM

Quote:

Originally Posted by OM617YOTA (Post 3269917)
Did you even look at the pictures? The cotton field mowing aren't even sealed into the filter. There is a direct path for dirt to get into your engine.

What are you talking about? You make it sound like you can shake a new filter and have dirt fall out of it.

:rolleyes:

oldsinner111 01-12-2014 12:54 PM

I buy STP filters which have mahnn stamped on them

tangofox007 01-12-2014 01:12 PM

Quote:

Originally Posted by gsxr (Post 3269911)
Fram is notorious for making some of the worst spin-on filters on the market. I would never use a Fram filter on any of my cars. Period.

Except for coming in an orange box, the Fram CH2930 filter has no relationship whatsoever to Fram spin-on oil filters.

Quote:

Originally Posted by gsxr (Post 3269911)
The lower pleated section of the filter is the bypass section, this goes out to the main oil gallery in the engine block.

In that case, what is being "bypassed?"

tjts1 01-12-2014 01:24 PM

Quote:

Originally Posted by OM617YOTA (Post 3269917)
Did you even look at the pictures? The cotton field mowing aren't even sealed into the filter. There is a direct path for dirt to get into your engine.

Anything that passes through the bypass filter goes into the sump and is then refiltered by the paper section of the filter before going into the engine.

I'm not sure people have a good understanding of how the MB bypass filter works. Maybe that's the real problem.

Do we really need 2 active threads on this subject?


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