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Seabeowner:
CB500 shop manual shows oil flow fairly clearly. Oil enters outside filter and exits via central bolt.
Looking at the centre bolt there are 4 holes that must be exposed above the filter when it is in situ. These are the 4 furthest from the crankcase. There are 4 more holes that must sit just inside the centre of the filter and these are blocked by the valve and spring up the CENTRE of the bolt, so that if excess pressure is built these 4 holes are exposed inside the filter and hence oil flows from the top 4 to the lower 4. The oil has now bypassed the filter, and can then enter the 6 further holes towards the threaded end as normal where it enters the galleries. Crisis averted...maybe. Sorry it's long winded.
Trigger:
A few pics of 750 and 500. The oil leaves the pump and enters the oil filter housing on the outside. The oil enters the four holes at the top of the oil filter bolt, as the pressure builds up the oil pushes the spring down and exits at the next set of four holes.
The 500
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The 750
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K2-K6:
Many different types of filter exit from the centre, it seems more common that way generally.
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As above most car cartridges are that way. Think it's partly because of more surface area outside and so longer interval before blocking becomes a problem. Also, pressure on the outside of a tube is easier to resist than the opposite with the same material's spec, so with both considerations you can reduce the filter size and still maintain the flow required.
Both fuel and air filters usually have outflow from centre generally if arranged in a loop configuration.
Seabeowner:
--- Quote from: Trigger on January 23, 2018, 12:24:58 PM ---A few pics of 750 and 500. The oil leaves the pump and enters the oil filter housing on the outside. The oil enters the four holes at the top of the oil filter bolt.
--- End quote ---
Surely if the oil enters the oil filter housing on the outside it simply flows through the filer. (unless it's blocked). It doesn't need the 4 holes at the top except when the pressure across the filter exceeds the spring setting.
Pressure alone will not open the bypass valve, only pressure drop across the filter.
hairygit:
That's the whole point, if the filter is severely restricted or blocked, the exposed holes allow oil in the force the bypass valve open and flow down the bolt to the engine. If the holes weren't there, and the filter was blocked, how would oil get to the engine??
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