51 replies to this topic

[nicklouse]

The magnet trap for the back of the box is the single worst thing for the oil system.

[Macming]

I've used this for 15 years plus in all my engine changes,After the first one or two oil changes, and after dismantling and cleans it pick up very little extra particles.

 

Peter

 

http://www.magnom.co...200-600-700.pdf

 

 

[Guess-Works.com]

I'm not a fan of the magnetic plug on the back of the gearbox either... Of those which I've removed from boxes... they have all been clean and free from particle.. which either means either there's nothing to trap, they are not trapping anything or what is being trapped is getting washed off...  IMO, they are a disaster waiting to happen.. much like badly designed central oil pickups which hoover the bottom of the gearbox case, but that's another gripe altogether...

[tiger99]

Well when I was doing very high mileage in Minis, much of it flat out, I only changed the oil every 6000 miles and used Castrol GTX. Engine life between reconditionings was always about 120k miles. We have better oils now, and I would suggest that 6000 miles would still be more than adequate for an engine in a mild state of tune.

And nothing except the proper magnet in the place where Alec put it, the sump plug. That what all the crud comes out every oil change.

Edited by tiger99, 31 October 2016 - 05:48 PM.

[neal]

The magnet trap for the back of the box is the single worst thing for the oil system.

Been thinking to what you guys are saying with mixed answers and can see this is quite a hot topic, the thought of a lump of filings letting go and to get chopped up by the oil pump sounds very feasible and quite frankly worrying , minispares sell HPS5 with a filter and HPS6 without and minisport?

I wonder if Simon(minispares)can comment on the product, maybe offer assurance or shed light on it from a manufacturers point of view, I would assume testing has taken place, I don't think I would purchase HPS6 without a filter but then HPS5 with a filter looks like it would trap swarf (how much and for how long maybe another question but they do say regular cleaning, also, would the filter drastically reduce oil flow putting additional workload on the pump?)

I'm thinking twice about the whole idea now, this is not necessarily a bad thing as there are good points from all,...but looking at this from different perspectives.

[nicklouse]

Good that you are thinking.

A collector in an oil flow I hate more so one where the flow rate changes. The one shown on the industrial engine will be used in a constant flow situation.

So back to the magnets around the filter. Where are they holding the metal? They are holding it before the filter element so the filter would catch them any way.

And again the most common damage to the bearings is through low oil pressure not metal contamination.

[mini13]

a few thoughts on this,

 

 

getting any metal out of the oil can only be a good idea, and there will be some due to the gearbox, as these ultra stron magnets are readlily available these days it makes sense for a start to stick on on the oil drain, they are so stron it will stay there and boost the magentism a lot.

 

the filter is another easy place to stick one, personally I would stick it on the radiatior side of the filter, as this is out of the most direct flow,

 

I would never stick one on any main metal part of the engine (block crank etc) as you'll attract metal to that, also watch out for parts interlinked with steel bolts that will transfer magnetism, ie stick to the gearbox casing, and oil filter ( which is isolated by the aluminium adaptor..

[neal]

Good points Nick and mini13, I'm now looking at oil filter paper/media specifications and wondering which manufacturer offers the best protection.



http://www.fram.com/...ort/tech-specs/ check out Understanding Fluid Filter Rating (PDF)

http://www.synlube.com/oilfilters.htm

https://www.bobisthe...t&Number=330243

[nicklouse]

And people wonder why I run a filter before the pump.

to be honest any of the big companies will be fine.

[neal]

And people wonder why I run a filter before the pump.

to be honest any of the big companies will be fine.

Tell me about the filter before the pump, I have heard of this somewhere before.

Edited by neal, 01 November 2016 - 12:51 AM.

[nicklouse]

Look through my build thread.

Note I would not do it on a road engine. Or a standard car space and heat issues.

[neal]

Look through my build thread.

Note I would not do it on a road engine. Or a standard car space and heat issues.

Will do, as for oil filters...I'm going to avoid buying the ones at £2.99 ish after what I've read, unless they can give me filtration details then I'm not interested, It's really surprising what crap is out there sitting on a shelf for someone who think they're getting a real good deal.

If I'm prepared to buy top notch oil for my engine and gearbox to bathe in, then I won't be buying a cheapo filter that's for sure!

Edited by neal, 01 November 2016 - 01:07 AM.

[Spider]

IMO, they are a waste of time.

 

Nothing lost by fitting them to your filter and I guess if it helps you sleep better at night, then fit them by all means.

 

The Oil Filter not only holds too great a volume of oil but is also too big in section for the magnets to have any meaningful effect, also, the viscosity of the Oil won;t allow the any magnetic particles to travel through it quick enough for the through flow rate to capture all the bits flowing by.

 

Of what it may capture, once the magnetic 'print' from the magnet is filled with magnetic particles, few more to none will be held in any case. Magnets work like an electrical circuit, once a magnetic path is closed from north to south of the magnet, any further extending magnetic field is finished.

 

Also, I think you'll find there's WAY more non-magnetic contaminates in going in to the filter in any case.

 

The term 'gimmick' springs to mind and is in the same class as fuel polarisers and flux capacitors.

Edited by Moke Spider, 01 November 2016 - 07:07 AM.

[Northernpower]

IMO, they are a waste of time.

 

Nothing lost by fitting them to your filter and I guess if it helps you sleep better at night, then fit them by all means.

 

The Oil Filter not only holds too great a volume of oil but is also too big in section for the magnets to have any meaningful effect, also, the viscosity of the Oil won;t allow the any magnetic particles to travel through it quick enough for the through flow rate to capture all the bits flowing by.

 

Of what it may capture, once the magnetic 'print' from the magnet is filled with magnetic particles, few more to none will be held in any case. Magnets work like an electrical circuit, once a magnetic path is closed from north to south of the magnet, any further extending magnetic field is finished.

 

Also, I think you'll find there's WAY more non-magnetic contaminates in going in to the filter in any case.

 

The term 'gimmick' springs to mind and is in the same class as fuel polarisers and flux capacitors.

I think your comment is tinged with a touch of jealousy simply because you haven't got a working flux capacitor.

[Spider]

 

I think your comment is tinged with a touch of jealousy simply because you haven't got a working flux capacitor.

 

 

 

OK, I give up - busted - caught red handed