Chat & Social > The Bar - General Chat
oil filter magnet
woody:
i have been fancying one of these for a while
has anyone used one
what are they like
which would you recomend as i have seen a few different types
TDi90:
not worth it IMO.
Drift:
Isnt that the point of the filter?
SteveGoodz:
--- Quote from: Drift on August 23, 2009, 10:37:25 ---Isnt that the point of the filter?
--- End quote ---
Yes, but if you made a conventional filter so that it would block particles in the order of 10-20 microns then the oil would also have trouble getting through as its molecules aren't much smaller and the pressure drop across the filter (due to restriction of flow) would become a problem. You can overcome the pressure problem by using filters with much larger surface areas but the closer the filtration size gets to the molecular size of the oil the bigger the areas needs to be.
These magnets may well come under the category of "snake oil" but the theory of having some method of removing small metallic particles from the oil feed is good. Of course, magnets doesn't work on non-ferrous materials (e.g. aluminium isn't magnetic below about 350oC) like the phosphor bronze alloys used in big end shells.
Indeed if all you want to do is filter out magnetic (i.e. ferrous) particles then just use a magnetic sump plug.
woody:
--- Quote from: SteveGoodz on August 23, 2009, 15:07:39 ---
--- Quote from: Drift on August 23, 2009, 10:37:25 ---Isnt that the point of the filter?
--- End quote ---
Yes, but if you made a conventional filter so that it would block particles in the order of 10-20 microns then the oil would also have trouble getting through as its molecules aren't much smaller and the pressure drop across the filter (due to restriction of flow) would become a problem. You can overcome the pressure problem by using filters with much larger surface areas but the closer the filtration size gets to the molecular size of the oil the bigger the areas needs to be.
These magnets may well come under the category of "snake oil" but the theory of having some method of removing small metallic particles from the oil feed is good. Of course, magnets doesn't work on non-ferrous materials (e.g. aluminium isn't magnetic below about 350oC) like the phosphor bronze alloys used in big end shells.
Indeed if all you want to do is filter out magnetic (i.e. ferrous) particles then just use a magnetic sump plug.
--- End quote ---
some good points made there
i like spinner filters like what i had when i worked on scanias
all the heavy particals stuck to the sides
Navigation
[0] Message Index
[#] Next page
Go to full version