Other Stuff > Tricks & Tips
Love this thead
Trigger:
Nope, the oil is under pressure from the oil pump (where the first pressure valve is) to the outside of the filter and if there is too much pressure then the oil under pressure enters the holes in red and exits through the next set of holes by compressing the valve and spring ;)
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K2-K6:
There's always a pressure drop as you go through the system else the oil wouldn't flow.
The leak down via crank bearings and cam supply etc is what allows space for the oil pump to push volume, it's only pressured because the bearing design allows for a controlled leak down as the engine's designer wanted, which in turn (combined with pump capacity) gives the desired replenishment rate to each bearing location and type.
The oil will simply take the path of least resistance. If the oil bolt blead valve is set above the resistance offered by a filter in good condition, then the oil's easiest route is through the filter material. If that becomes more restrictive to the point it exceeds the blead valve resistance then the easiest path is that through the emergency bolt holes.
The above has to be lower than the oil pump's own relief valve though as you'd get a non supply through that route being opened.
It's the same as any pressure relief valve though, in that you can design it pointed in either direction. This one is just used as an exit from the filter housing as it exceeds the spec it's designed to if the normal operation is impeded by the filter material being blocked.
It's right to say that it is going to a low pressure area though as the bearings are inheritently leaky so if supply slows down, the pressure will drop accordingly. That's why the oil light would come on if you reduced supply volume.
Trigger:
Can we all agree that the magnets will work ;D ;D ;D
A magnetic oil filter bolt would work much better than a magnetic sump bolt, me thinks ;)
K2-K6:
Oddjob, as you say it's something that's so reliable you never really have cause to do anything with it other than when you replace the filter during service.
Trigger, I'd say sump was preferable just so anything you catch hasn't had to go through the oil pump, both sides of it and also expose the leak back valve, plus possibly the pressure relief valve to bits that may degrade their operation.
You're going to get most of it during run in of new bores as you've pointed out "sump marzipan" (well that's what it feels like) which is going to diminish fairly quickly when rings etc have completed lapping.
Less interaction on the 400/500/550 though.
royhall:
OddJob has an engine with 263,000 miles on it without problems. Just how would magnets enhance that. We have managed nearly 50 years with nothing other than a magnetic sump plug to help things, and loads of engines go over 100,000 miles without issues. Surely that's why we change the oil so often, so with magnets we can go 5000 miles between oil changes then. I think not. I'm not really sure what problem this fix is fixing. ;)
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