Topic: Why would someone NOT do this?

[Whaleman]

I believe this has been talked about before. Every computer hard drive has one or some two small VERY powerful magnets. Stick two together and they are hard to seperate. Junk hard drives are easy to come by at computer repair shops. I got a bunch from the companys IT dept. They are a pain to take apart, but once you know what they look like they are easy to find. I put 3 on the metal part of the oil filter. I have never had large pieces of steel on them but there is always a black film on them. The magnets look like they are custom shaped for a CB750 filter. Thanks for reading. Dan

[ekpent]

Well I guess you guys won't have to put up my my crap anymore because I need to smash my computer to get a magnet. Been fun      I see Dave500 does that also, seems like a good idea if you have the materials.

[flybox1]

Raided the rare earth magnet bin at work and added six 12mm round magnets to my filter.
Inside the oil pan is a good place, too.

[dave500]

in the pan so long as they cant get sucked into the wirring gears?
http://forums.sohc4.net/index.php?topic=103432.0

[Retro Rocket]

in the pan so long as they cant get sucked into the wirring gears?
http://forums.sohc4.net/index.php?topic=103432.0

Put one on the sump bolt....

[70CB750]

I have those on the outside of the spin on, one of these days I will disect oil filter  to see what it does inside.

[Deltarider]

I don't see any advantage at all, but that's just me. Any motors that are standard equipped with this?

[Bailgang]

I don't see any advantage at all, but that's just me. Any motors that are standard equipped with this?

I doubt any short term benefits but it's a plus from a long term point of view. I've seen quite a few automatic transmissions with a magnet setting in it's pan from the factory as well as magnetic drain plugs on manual transmissions and a few engines that were factory installed. I think the point Whaleman is making is simply making good use of something you may already have but aren't using such as in this case the magnet from a junk hard drive. And if you don't have any old hard drives laying around you can always pick up some rare earth magnets at an electronics supply store.

[Retro Rocket]

I don't see any advantage at all, but that's just me. Any motors that are standard equipped with this?

Quite a few  cars have them in the engine sump and in the gearbox sump, Some Lexus models have 3 in the gearbox sump and 2 in the engine sump, there are companies that make them for bikes as well... You don't see the advantage of removing metal from your oil...?

[AJK]

I don't see any advantage at all, but that's just me. Any motors that are standard equipped with this?

Quite a few  cars have them in the engine sump and in the gearbox sump, Some Lexus models have 3 in the gearbox sump and 2 in the engine sump, there are companies that make them for bikes as well... You don't see the advantage of removing metal from your oil...?

+1 what Retro says, but also to add that it serves as a good indicator of what the magnets are picking up. I.e. A general visual on particulates its catching from the motor. I've got them in mine as well and probably extends filter life a bit as well because those bits are not required to be caught by the filter with the magnets present.

[Whaleman]

Thanks everyone for reading. I stand by my title," why would someone NOT do this". It is free. It can't hurt anything. It will grab steel even too small to be caught by the filter. This is the black film I always have on them. Three of these are way stronger than a magnet in the drain bolt. Sure, it won't catch aluminum. It won't fix something that is broken. It will tell you if something is going bad. I think getting out the very very small pieces of steel can have a long term effect on engine wear. These magnets will never fall off the filter. I am sure they catch steel on the inside of the filter also. Need to cut one open to see. Thanks Dan

[Deltarider]

You don't see the advantage of removing metal from your oil...?

I had a magnetic drain plug but abandoned it. It never catched anything that I saw and that made me wonder. There can be quite some movement in the sump pan and I didn't like the idea that collected particles became loose in once and then headed for the oil pump. Magnets on the filter? I don't see the advantage. The filter catches the smallest particles and what is smaller is kept in suspension by the oil.

[Whaleman]

You are correct Deltarider the small particles of steel are kept in suspension in the oil acting as valve grinding compound on everything they touch. Dan

[Deltarider]

You are correct Deltarider the small particles of steel are kept in suspension in the oil acting as valve grinding compound on everything they touch

Boy, you scared the hell out of me. On second thoughts... maybe our definition of suspension differs.

[AJK]

You are correct Deltarider the small particles of steel are kept in suspension in the oil acting as valve grinding compound on everything they touch

Boy, you scared the hell out of me. On second thoughts... maybe our definition of suspension differs.

I got the idea from Dave, thanks Dave.

http://forums.sohc4.net/index.php?topic=103432.0

If you have a look at his thread, they pick up a lot of fine stuff, so without the magnets present, the filter would have to catch it, but the filter won't catch the real small iron particles (sub 10 micron stuff). Installing the magnets on the filter i think gives it pretty good coverage, wheras a sump bolt probably won't catch much.

Sure, the magnets arn't compulsory, but if you have a spare few magnets laying around (or old hard drives), why not.

[Whaleman]

I never saw that thread. I picked up the idea on another forum. That black sludge like inky paint is exactly what I was trying to describe. Dan

[Dream750]

Magnets on the filter? I don't see the advantage. The filter catches the smallest particles and what is smaller is kept in suspension by the oil.

On a CB750, one advantage is collecting magnetic particles when the oil filter element becomes restricted and the pump discharge pressure rises excessively. At 21.3 lbs, +/- 1.5 lbs pressure difference, the oil filter bolt bypass valve opens. This unfiltered oil will bypass the filter element and flow directly into the main oil gallery. The primary magnets will need to be located on the oil filter and/or housing to be the most effective during bypass operation. Having a secondary set of magnets located in the oil pan would also help. Since the all important zinc oil additive is non-magnetic, there shouldn't be any worries by using magnets.
 
I can’t comment on the other SOHC four models and their oil system operation.    

[Whaleman]

wow, I did not know it bypasses at that low a pressure. Does that mean at cruseing speed all oil is bypassing the filter?   OOPS did not see pressure difference. never mind. Dan

[Bailgang]

You don't see the advantage of removing metal from your oil...?

There can be quite some movement in the sump pan and I didn't like the idea that collected particles became loose in once and then headed for the oil pump. Magnets on the filter? I don't see the advantage. The filter catches the smallest particles and what is smaller is kept in suspension by the oil.

As strong as rare earth magnets are, if they were collecting so much debris that there was a risk of some of it dislodging and headed for the oil pump then I think it's fair to say your engine would already have some serious problems and any debris dislodging from the magnet would be the least of you concerns. We're not talking about hooking up to electromagnets from Fermilab or CERN, simply reusing rare earth magnets many of of us may already have in an effort to make our existing oil filters more efficient. You asked about engines that are standard equipped with this and that's been answered but it's still a foolish idea?

[flybox1]

More import right after a rebuild as parts wear-in....

[bjbuchanan]

More import right after a rebuild as parts wear-in....

I agree. The mating of parts is where it really comes in handy. After a while, in theory atleast, it shouldn't be collecting basically any shaving because it should be worn together and relatively friction free

Lots of manufacturers use them, you see them more standard in auto trannys. That is that fine black sludge on it, shavings. It can't hurt, but who knows how much it could help.

[Whaleman]

At a cost of $0.00 it really does not have to help much to pay for the investment. Dan

[Deltarider]

You asked about engines that are standard equipped with this and that's been answered but it's still a foolish idea?

Who said it is a foolish idea?
Let me redefine my question. The motorcyclemarket nowadays is all about image and marketing. There are some expensive brands that like to profile themselves as the non plus ultra perfectionists. Do they mount magnets? It's just a question and I'd like to learn.

[Don R]

The Allison transmission in my duallie has a creamic magnet between the filter and the trans, I suspect it would fit other filters too. The magnet on the drain plug of my dragster caught a loose bolt, It had already done damage but it did stay on the magnet once it got there.   I also found rocker arm needles from the bearings on a magnet.
 I  am totally sold on the idea, so is Moroso Race components and the allison division of
General motors.

[Bailgang]

You asked about engines that are standard equipped with this and that's been answered but it's still a foolish idea?

Who said it is a foolish idea?
Let me redefine my question. The motorcyclemarket nowadays is all about image and marketing. There are some expensive brands that like to profile themselves as the non plus ultra perfectionists. Do they mount magnets? It's just a question and I'd like to learn.

I apologize for making that assumption and just so you know I don't have any magnets on my 750 at the moment either but that's mainly because I don't have a junk hard drive laying around and my local electronics shop doesn't have the ones I want. I have tried the idea before on my 550 but the hard drive mags I had were still on the filter of the 550 when I sold it.