Author Topic: Love this thead  (Read 5687 times)

Offline Trigger

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« Last Edit: January 20, 2018, 07:56:33 AM by Trigger »

Offline royhall

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Re: Love this thead
« Reply #1 on: January 20, 2018, 08:56:53 AM »
I guess they don't bother cleaning the parts after a rebore. The bearings in that engine must be toast. ;D
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Offline Trigger

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Re: Love this thead
« Reply #2 on: January 20, 2018, 09:04:41 AM »
I guess they don't bother cleaning the parts after a rebore. The bearings in that engine must be toast. ;D

The debris on the magnet are from the end of the new rings and the rings scrapping into the crosshatch on the bores  ;)

Offline royhall

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Re: Love this thead
« Reply #3 on: January 20, 2018, 09:17:51 AM »
Point taken Trig, just looks like a hell of a lot of metal in that oil. Maybe that's the magnet trick doing its job well. A lot of that shit may be stuck to the inside of my cases as there was nothing like that amount at first oil change.
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Offline Green1

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Re: Love this thead
« Reply #4 on: January 20, 2018, 11:28:56 AM »
Am I the only one that thinks this is a totally pointless exercise.
Why would you put something within the engine that could potentially brake up or work lose and find its way around the engine?
Doesn't the filter catch the bulk of the debris?
If the magnets worked why can I see so much crap in the oil still?
Shouldn't you change the oil to remove contaminants anyway?
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Offline Rozabikes Tim

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Re: Love this thead
« Reply #5 on: January 20, 2018, 12:02:32 PM »
 Sod the technicalities of magnets and stuff, you can see how Mr T was voted in from some of those gentlemen's theories.....

Wierd the software here would not let me refer to that god like man by name. It   overwrote *** #@%$ free zone *** etc. (Let me do it there though) STEVE?
One day I'll have the time to restore it, not just talk and dream....

Offline royhall

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Re: Love this thead
« Reply #6 on: January 20, 2018, 12:44:08 PM »
Is it usual after a rebore to have that amount of crap in the oil? I have never seen that much before by quite some way. That would worry me.
Current bikes:
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Honda CB350F in Candy Bacchus Olive
Honda CB750F2 in Candy Apple Red
Triumph Trident 660 in Black/White
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Offline SteveD CB500K0

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Re: Love this thead
« Reply #7 on: January 20, 2018, 02:32:53 PM »
Sod the technicalities of magnets and stuff, you can see how Mr T was voted in from some of those gentlemen's theories.....

Wierd the software here would not let me refer to that god like man by name. It   overwrote *** *** This is a #@%$-free zone *** free zone *** etc. (Let me do it there though) STEVE?

I put that in during the election campaign (all 18 months of it)

The US site gets bogged down in politics. You are the first to mention it...   8)
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Offline Trigger

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Re: Love this thead
« Reply #8 on: January 20, 2018, 09:48:06 PM »
Would I take the piss  ;D To be honest, it just shows how much the filter does not trap. The thread is just a alternative to a magnet sump bolt. If the filter is that good, then why do I find loads of crap in most sump pans  ;) When you next do a oil change, drop a powerful magnet in the oil afterwards, you maybe surprized.

Offline Green1

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Re: Love this thead
« Reply #9 on: January 20, 2018, 09:55:40 PM »
I'm not going to worry about a little bit of crap in the oil if its soft it won't damage anything.
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Offline K2-K6

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Re: Love this thead
« Reply #10 on: January 20, 2018, 09:56:50 PM »
The 750 schematic shows the filter housing flooded first and then exit via the filter bolt centre to the pressure galleries.

I can see the logic of having magnet in sump somewhere as it would "if effective" let less ferrous go through the pump first. But as already said,  the filter should be able to stop further circulation just based of its micron rating.



Offline royhall

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Re: Love this thead
« Reply #11 on: January 21, 2018, 08:55:21 AM »
If these bikes are well maintained they do 100,000 miles plus without problems. So why is it 50 years on we now need magnets on the filters. What a load of bull, that's just a fix looking for a problem that doesn't exist . As I said earlier, I have never seen anywhere near that much crap in the oil when it's changed. That guy's engine is eating itself, bet he's talking about rebuilds by spring.
Current bikes:
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Honda CB350F in Candy Bacchus Olive
Honda CB750F2 in Candy Apple Red
Triumph Trident 660 in Black/White
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Offline K2-K6

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Re: Love this thead
« Reply #12 on: January 22, 2018, 07:45:28 AM »
Agree it looks back to front and slightly illogical but the honda illustration definitely shows oil supply from filter bolt into distribution galleries for crank etc.

Isn't the filter pushed against the engine case with a spring to leave the first holes (nearest to bolt head) exposed? The route through those holes into the bolt cavity is the overpressure (blocked filter)  route I thought. Haven't got one in front of me,  so please correct if wrong.

Most filters like this flow inwards as they generally have a cage in the core to prevent collapse. If you blow out through the filter structure it can't be supported to prevent it dismantling itself.  You do see that type but they've normally got a metal "can" with holes in it to allow that pressure direction to be contained.
The filter housing pressure is more or less the same which ever way it's pumped as the whole oil system from pump out to bearings is equal,  maybe a very small pressure drop across the filter material,  but that's all.

Canister car type filters are usually the same,  in through the peripheral holes and out through the centre bolt.

« Last Edit: January 22, 2018, 11:25:25 AM by K2-K6 »

Offline hairygit

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Re: Love this thead
« Reply #13 on: January 22, 2018, 09:59:08 AM »
If the filter becomes clogged, the pressure in the housing builds up, pressing down on the relief/bypass valve in the hollow bolt, allowing unfiltered oil to flow round the engine. The theory being, unfiltered oil is better than NO oil.
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Offline K2-K6

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Re: Love this thead
« Reply #14 on: January 22, 2018, 11:53:09 AM »
Yes, if the filter gets more restrictive through particals, then pressure rises on the outside of element to a point which will breach the pressure set by the blead valve in the bolt.

This has got to be below the oil pump pressure relief valve threshold or it would just go out that way first.

 

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