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Magnet in filter housing. (2015)

Discussion in 'Norton Commando Motorcycles (Classic)' started by Kvinnhering, Dec 6, 2015.

  1. Kvinnhering

    Kvinnhering VIP MEMBER

    Joined:
    Feb 16, 2011
    Hello.
    I changed oil and filter on my Commando tonight and then came this idea up.
    Ring magnet placed in the filter housing. I think this came from the sump on a Chevrolet engine. The magnet is 6,7mm thick, outer diameter is 45 mm and the hole is 19.3mm.
    I see no reason not to use this. Or are there any drawbacks I don't know about?







    Jan-Egil
     

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  2. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    Well it's a good idea as long as it fits. Looks to be a little proud of the filter face.. It should be strong not brittle as you don't want it to snap or break into bits. :)
     
  3. DogT

    DogT VIP MEMBER

    Joined:
    Jan 20, 2009
    Maybe think about getting some rare earth magnets (strong) that are larger than the holes and thinner to go between the holes? I have some in my John Deere transmission filter since the brake lining metal got into the hydraulic system and ate the hydraulic pump to the tune of $700 plus my work. We won't talk about breaking the tractor in half to replace the throw out bearing or removing the rear axles and tires to change the brakes, inboard to the transmission.
     
  4. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    Ewww... Nothing runs like a Deere. Feel for ya.
     
  5. kommando

    kommando

    Joined:
    May 7, 2005
    You can just stick a magnet to the back of the filter as an alternative, no risk of it not fitting and less risk of it interfering with bypass valves as its much further away.
     
  6. travelerjerry

    travelerjerry

    Joined:
    Jul 24, 2003
    Here is a oil filter magnet I put on my oil filter. Whether it works or not remains to been seen. Would have to cut the end of filter with magnet on to see if any particles were attached.
     

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  7. Kvinnhering

    Kvinnhering VIP MEMBER

    Joined:
    Feb 16, 2011
    Thanks for many good point as usual on this forum.

    Yes, the magnet sticking out of the filter, But there is plenty of space for the magnet inside the filter housing.
    The magnet seems to be brittle, but I belive any fragments will be taking up of the filter.

    I will split up the filter and see how by-pass valve is constructed and placed in the filter. And after that I will consider placing a magnet on the outside of the filter.

    Travelerjerry.
    Nice if you show pictures of your filter when you have cut the end of.

    Jan-Egil.
     
  8. Kvinnhering

    Kvinnhering VIP MEMBER

    Joined:
    Feb 16, 2011
    Hello gents.
    Following up this old thread.
    I have not found any negative aspects of having this magnet attached to the filter inside the filter housing. I have used this on my Commando for over three seasons. Have also without a problem put in a magnet in a other Commando I have sorter out.
    The magnet doen’t disturb the oil flow, but it is in the oil stream and draws steel particles from the oil BEFORE it passes through the filter. This gives an early visual alert if something is going on with the engine. And pick up smal steel particles which might otherwise pass the filter.

    The are no problem with bypass valve. In my filter this is on oposit side and are made of plastic.
    35BB81EF-D1A6-4F5B-8EE4-B66FA43FFC45.jpeg

    1346D04E-7B55-4CC0-94CB-388AD06063E9.jpeg
     
  9. oldmikew

    oldmikew

    Joined:
    Jul 25, 2015
    But why not just let the rare earth magnets stick on the oil filler dip stick... the sump magnet on some drsin plugs is surely good ... it pulls stuff out of the oil stream before its gone back through the pump
     
  10. Onder

    Onder

    Joined:
    May 11, 2010
    I think hobot mentioned that it will pick up the ferrous stuff but not all the ally bits that are floating about.
    Rare earth on the outside of the filter are the way I go. Probably doesnt do much but make me feel better.
     
  11. Kvinnhering

    Kvinnhering VIP MEMBER

    Joined:
    Feb 16, 2011
    Yes, there are many different ways to install magnets in the oil stream. I would report that this is also a possible solution.
    What is best, I don’t know, but one thing is certain I will continue with this solution. In addition to my magnet in the bottom plug in the crank case and in the drain plug in the oil tank .
     
  12. Kvinnhering

    Kvinnhering VIP MEMBER

    Joined:
    Feb 16, 2011
    Agree, but I hope that most of the aluminum particles will be filtered out before returning to the engine. Another thing I know is that aluminum is softer than steel.;)
     
    Last edited: Jul 21, 2018
  13. mdt-son

    mdt-son

    Joined:
    Jan 19, 2012
    https://www.nortonownersclub.org/support/technical-support-commando/oil-filters
    http://atlanticgreen.com/oilfilter.htm

    The paper element Crosland 673 filter used in the Commando oiling system is very basic. Typical numbers for paper element filters are filtration levels of 40% at 10 microns, 60% at 20 microns, 93% at 30 microns, and 97% at 40 microns. However, while swarf if normally catched, the harmful soot and sludge residues which concists of particles below 25 microns are not.

    Filtering is about pressure drop and surface area.

    An effective filtering method which will remove swarf, sludge and soot down to less than 1 micron (depending on the design) at minimum pressure drop is by use of a centrifugal filter. Engine oil pressure spins a rotor inside the filter body at 6,000 rpm’s. That force separates the solid contaminates from the main oil supply while slinging the solids to the inside walls of the rotor, which is easily cleaned. Honda uses this filtering method on some of its models. Adoption of this filtering method on our Norton bikes will require a secondary in-line oil pump, or a booster pump for the scavenge line. Centrifugal filters work better than cartridge filters in filtering low viscosity (i.e., cold) engine oil.

    Swarf and sludge may also be trapped in a so-called 5 micron cartridge filter. These filters are larged than the usual paper element filters and they also generate a larger pressure drop, hence they are difficult to adopt on a motorcycle.

    -Knut
     
    Last edited: Jul 21, 2018
  14. Kvinnhering

    Kvinnhering VIP MEMBER

    Joined:
    Feb 16, 2011
    By changing oil regularly, one reduces this. But of course, this costs money, but the same does engine overhaul ;)
     
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