Results 1 to 4 of 4

Thread: Aftermarket air filters - Engine Damage

  
  1. #1
    Status
    Offline
    mark_dj's Avatar
    AOC Obsessed
    Join Date
    May 2003
    Posts
    4,728
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)

    Aftermarket air filters - Engine Damage

    Well this has made me want to put my standard box and filter back on as a lad left this message on my forum :?

    I worked for race teams for years. One Toyota Atlantic teem I worked on the driver thought the car was lossing power from the start of a race to the end. So we did leak down checks when we got new engines in. 3% leak down- New. At the end of a race we checked it again and we got 29% leak down. So we sent the head to get the valves done and checked the leak down when the head returned. 4%- Leak down. At the end of the next race 31%- leak down. So we put three dabs of grease down streem of the air filter. "K&N" The next engine came in with 3%-leak down new. And at the end of the race 32%- leak down and the dabs of greas were full of grit. So we changed the filter to a oiled fome filter. 3%- leak down new and at the end of the next race? 18%-leak down. Better still not good. So we made a new air box and used a Mustang GT stock air filter. 3%-leak down new at the end of the next race? 1%- leak down yes I said "1%". The rings bed in and the engine seals up. We went from changing a engine at 300 miles with 29 to 34% leak down to. Changing the engine at 800 miles with 7% leak down.

    So the bottom line is. You mite gain a littel more power (1 to 2hp) but it will not last long and befor you know it you will have a LOT less.
    I work on 944s only and when I tare down a 944 engine that has had a K&N filter the cyclenders have a LOT of scores from dirt that got through the filter.
    If you dont beleve me do the grease test your self. Take out the filter and put a dab of grease in the air box. Then put your K&N filter in and dive the car for a few weeks and pull the filter out and check the dab of grease.

    Is it true?

  2. #2
    Status
    Offline
    Iain_Ritchie's Avatar
    AOC Fanatic
    Join Date
    Jun 2003
    Posts
    433
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    It is possible for dirt to be sucked into the engine, thru the air filter... i guess, becuase after market filters let more air in, they dont filter the air as much so some dirt gets past....
    Iain Ritchie
    body kit and new wheels on there way!
    http://uploader.co.uk/images/marv_-_...itchie_sig.jpg

  3. #3
    Status
    Offline
    Keif's Avatar
    Going Topless!
    Join Date
    Jun 2003
    Drives
    Astra 1.8 Twintop, Lotus Carlton, Meriva VXR and Nova
    Posts
    11,742
    Mentioned in
    1 Post(s)
    Quoted
    11 Post(s)
    As i read this, is he talking about a K&N induction kit? Then swapping to a standard airbox/filter.

  4. #4
    Status
    Offline
    pudsey's Avatar
    AOC Regular
    Join Date
    Feb 2004
    Posts
    217
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    OMG!!! :shock:

    That means all that crap k&n say about being better filtration is crap!??

    Is it something to do with the amount of suction thru the filter, if you have a large thruput of air, it could be sucking grit thru, maybe the filter was too small for the application?? :?
    mmmmmmmm, nice try!

Similar Threads

  1. Show me your CONE FILTERS!! (Or aftermarket air filters) on your ZLE*
    By AdamH-SRi-T in forum Turbo Petrol Engines inc. Transmissions
    Replies: 42
    Last Post: 08-05-2012, 00:20
  2. How good are aftermarket filters ?
    By xerodude in forum NA Engines (Non-turbo petrol) inc. Transmissions
    Replies: 11
    Last Post: 30-12-2003, 17:43

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •