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Thread: Here's One for the K&N Doubters...

  1. #1
    Regular Member Jezzy's Avatar
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    Default Here's One for the K&N Doubters...

    Some people say (they've heard) that K&N panel filters allow dirt and dust into the engine. It's always Chinese whisper rather than first hand experience, but I suspect it comes from people who say that you can see through the filter, so it can't possibly be filtrating properly. I've tried looking through it, and I can't see through it - so if you can, it's probably because you've bought a second hand one that the seller washed but didn't bother to re-oil (because he didn't want to buy the K&N oil kit).

    Anyway, I opened up the airbox on my Signum today, to clean the bottom half (the unfiltered side), and took these two pictures. The first picture is of the bottom side, and as you can see, it's quite dirty. The second is of the top half - the filtered side - and it's totally spotless. You can also see the filter itself in the top right corner, in case anyone thinks I've cheated and been using the paper filter instead.










    The eagle-eyed amongst you will spot that I haven't done the "airbox mod" (well, I did for a minute, when I removed the trumpet as part of the cleaning process, but it went back in again). I'm not going to, as it's either there for accoustic reasons (make it quieter) or to smooth the airflow ahead of the MAF, and I'm fine with both of those benefits.

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    Regular Member luke.oldham's Avatar
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    you should do the air box mod mate.

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    Regular Member luke.oldham's Avatar
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    Quote Originally Posted by luke.oldham View Post
    you should do the air box mod mate.
    just read the bottom bit .lol.

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    Regular Member leonvectrac's Avatar
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    I need to do mine as part of my service i done the other day but i ran out of light and energy to do the rest lol. so will see what mines like when i do it hopefully the same.

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    Regular Member byebyeitsagsi's Avatar
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    Quote Originally Posted by Jezzy View Post
    The eagle-eyed amongst you will spot that I haven't done the "airbox mod" (well, I did for a minute, when I removed the trumpet as part of the cleaning process, but it went back in again). I'm not going to, as it's either there for accoustic reasons (make it quieter) or to smooth the airflow ahead of the MAF, and I'm fine with both of those benefits.
    Spot on thats the way i see it aswell.

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    Regular Member Mopar Man's Avatar
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    I see there are mixed opinions, about THE AIR BOX MOD?

    It has been fitted for a reason. Maybe to flow, direct the air to the back of the box, to force feed the trumpet above the filter.
    Still not convinced, that a K&N stops dust particles like a paper one does.
    And see from the VW forum, rolling road test, that there is no gain with a K&N.
    Have heard this rumour elsewhere.

  7. #7
    Regular Member Mopar Man's Avatar
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    Quote Originally Posted by Jezzy View Post
    Some people say (they've heard) that K&N panel filters allow dirt and dust into the engine. It's always Chinese whisper rather than first hand experience, but I suspect it comes from people who say that you can see through the filter, so it can't possibly be filtrating properly. I've tried looking through it, and I can't see through it - so if you can, it's probably because you've bought a second hand one that the seller washed but didn't bother to re-oil (because he didn't want to buy the K&N oil kit).

    Anyway, I opened up the airbox on my Signum today, to clean the bottom half (the unfiltered side), and took these two pictures. The first picture is of the bottom side, and as you can see, it's quite dirty. The second is of the top half - the filtered side - and it's totally spotless. You can also see the filter itself in the top right corner, in case anyone thinks I've cheated and been using the paper filter instead.










    The eagle-eyed amongst you will spot that I haven't done the "airbox mod" (well, I did for a minute, when I removed the trumpet as part of the cleaning process, but it went back in again). I'm not going to, as it's either there for accoustic reasons (make it quieter) or to smooth the airflow ahead of the MAF, and I'm fine with both of those benefits.
    You will not get any dirt on the upside, the suctoin side?
    Any dirt will have been sucked into the engine.

  8. #8
    Regular Member Jezzy's Avatar
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    Quote Originally Posted by Mopar Man View Post
    Have heard this rumour elsewhere.
    Can you think of any subject for which there aren't any rumours? lol

  9. #9
    Regular Member byebyeitsagsi's Avatar
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    Any gain would be small but its all about letting the engine breath better.

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    Regular Member moorlander's Avatar
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    the only gain with a K&N is to save waste! If you are keeping the car for a long time then fine, otherwise quality paper filters will do exactly the same - if not better (& I dont like the idea of putting oil on your filter then putting it anywhere near the engine) your pic is the same as my airbox when I change my filter every 12months!

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