donaldson Air Filter
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Senior User
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donaldson Air Filter
does anyone know the specifics of the stock donaldson filter? Is it multi stage?
I have a few creases in the back side of the filter "dirty side" The mesh pattern is slightly damaged. I wonder if this is a issue, i.e. should I replace the filter because the creases?
I have a few creases in the back side of the filter "dirty side" The mesh pattern is slightly damaged. I wonder if this is a issue, i.e. should I replace the filter because the creases?
Lead Driver
Joined: Nov 2007
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I don't know much about them except it's a big roll of cardboard with some blue stuff on it. I can't see how creases would hurt a thing since eventually it'll be replaced.
I took one apart and the roll must've been at least 50' long.
I took one apart and the roll must've been at least 50' long.
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Senior User
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What do you mean eventually it will be replaced? you mean when I replace it?
Any idea how many layers of media the air has to pass through? there can't be just one layer... I just want to make sure any small tears will not let dirty air though.
Lead Driver
Joined: Nov 2007
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It doesn't really have layers. Imagine a piece of cardboard rolled up with the corrugated ridges running the length of the filter, in the same direction of airflow. The corrugation creates the airgaps between the rolled layers so you don't end up with a solid roll of paper. The filtered air never actually passes through anything. The dirt just gets stuck to the insides as it goes by. You can see daylight right through a new one..
Hotshot
Joined: Jul 2005
Posts: 13,834
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From: Middle Tn.
It doesn't really have layers. Imagine a piece of cardboard rolled up with the corrugated ridges running the length of the filter, in the same direction of airflow. The corrugation creates the airgaps between the rolled layers so you don't end up with a solid roll of paper. The filtered air never actually passes through anything. The dirt just gets stuck to the insides as it goes by. You can see daylight right through a new one..
Thread Starter
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Senior User
Joined: Jan 2010
Posts: 434
Likes: 0
It doesn't really have layers. Imagine a piece of cardboard rolled up with the corrugated ridges running the length of the filter, in the same direction of airflow. The corrugation creates the airgaps between the rolled layers so you don't end up with a solid roll of paper. The filtered air never actually passes through anything. The dirt just gets stuck to the insides as it goes by. You can see daylight right through a new one..
Post Fiend
Joined: Jul 2005
Posts: 6,127
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Not quite so simple.
he principle of HEPA filtration is not to restrict the passage of particulate by the gap between fibers, but by altering the airflow streamlines. The airflow will slip around the fiber, but any higher-density bioaerosols or particulate matter will not change direction so rapidly and, as a result of their inertia, will tend to impact the fiber. Once attached, most particulates will not be re-entrained in the airstream.
That is the simplest description of the mechanism.
But in fact, there are more mechanisms at work:
Molecular diffusion
Inertia
Gravity
Interception
Attachment
Straining
London van der Waals
Forces involved include Inertia, London van der Waals, Electrostatic, Viscous, Gravitational and Thermal
Inertia
Gravity
Interception
Attachment
Straining
London van der Waals
Forces involved include Inertia, London van der Waals, Electrostatic, Viscous, Gravitational and Thermal
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Posting Guru
Joined: Feb 2009
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From: Moyock, NC
I believe you're fine with the creases...
PowerCore®Air Filters
Donaldson premium air filters that utilize PowerCore™ filtration technology for Ford 6.0L Diesel PowerStroke™ and GM H2 Hummer 6.0L Vortec™ plus other applications listed below. The rugged structure of PowerCore™ filters features an innovative, layered, fluted filter media, which allows air to enter an open flute while forcing it out an adjacent flute, allowing only clean air into the engine. Dirty air is effectively filtered and cleaned in only one pass through the media.
PowerCore®Air Filters
Donaldson premium air filters that utilize PowerCore™ filtration technology for Ford 6.0L Diesel PowerStroke™ and GM H2 Hummer 6.0L Vortec™ plus other applications listed below. The rugged structure of PowerCore™ filters features an innovative, layered, fluted filter media, which allows air to enter an open flute while forcing it out an adjacent flute, allowing only clean air into the engine. Dirty air is effectively filtered and cleaned in only one pass through the media.
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Lead Driver
Joined: Nov 2007
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Like I posted earlier, I don't know much about them. AFAIK they're magic filters.
Actually, when we cut one apart, I do remember the engine side being much more solid than the inlet side. That must be where the air passes through the adjacent flutes like Moyock posted.
Actually, when we cut one apart, I do remember the engine side being much more solid than the inlet side. That must be where the air passes through the adjacent flutes like Moyock posted.
Post Fiend
Joined: Jul 2005
Posts: 6,127
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Like I posted earlier, I don't know much about them. AFAIK they're magic filters.
Actually, when we cut one apart, I do remember the engine side being much more solid than the inlet side. That must be where the air passes through the adjacent flutes like Moyock posted.
Actually, when we cut one apart, I do remember the engine side being much more solid than the inlet side. That must be where the air passes through the adjacent flutes like Moyock posted.
A top quality filter like that one will have a lot of "black magic" in it.
Carefully blended fibers to generate static electricity with air flow, mix of fiber densities, etc.
Coatings to tweak it.
None of this they will tell you --- nor is it obvious in a simple examination from cutting it apart.
If it is so easy, you would have the market flooded with Chinese made clones for $5 a filter.
Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 25
From: Middle Tn.
Like I posted earlier, I don't know much about them. AFAIK they're magic filters.
Actually, when we cut one apart, I do remember the engine side being much more solid than the inlet side. That must be where the air passes through the adjacent flutes like Moyock posted.
Actually, when we cut one apart, I do remember the engine side being much more solid than the inlet side. That must be where the air passes through the adjacent flutes like Moyock posted.
