400 Four Oil filter - "genuine" or "aftermarket" ?

[McCabe-Thiele (Ted)]

Doubtful Ken the pump pressure beats gravity by a helluva lot

I assume when you say gravity you mean standard air pressure at sea level - it's about 14.7 psi or 34 ft of water in a manometrer pretty sure most pressure gauges already take this into account?
When you check your tyres at a garage & the reading is 30 psi that is not absolute pressure but the differance between the atmosphere & your tyre so its relative pressure.

With regards to oil flows fluid mechanics are pretty complicated as we tend to assume fluids are not compressible we make assumptions about changes in viscocity & density that change with temperature. Not to mention none Newtonion Fluids or one of my favourite subjects powders that can act like liquids and defy normal logic when you try to mix them & Thixotropic fluids.

At a fixed oil pump rotation speed the volume of oil pumped (as opposed to weight) should ideally be constant regardless of the viscocity of the oil assuming pump efficiency losses are as close to zero as possible at a constant temperature.

[K2-K6]

Doubtful Ken the pump pressure beats gravity by a helluva lot

How many PSI is gravity Bryan 

There is a relationship there that has an effect. If he put more volume there, above the test site, it should exercise more pressure on the membrane from increase in mass. And why waterproof stats give hydrostatic pressure figure to illustrate this, I brlieve.

I've seen it the other way round, having to pump liquid up floors in a building, arranged for pump etc but it couldn't lift the liquid at that specific gravity the required amount, as soon as the tube filled up the pump head couldn't exert enough pressure to move that column.  Had to use expensive high pressure stainless steel pump heads and reduce the pipe diameter to get it lifted effectively.

Also, if you reduce pressure in a pipe then even Mercury will be pulled up as you've reduced atmospheric pressure acting on that mass from 14.7psi to lower and let effectively made the Mercury mass less, how vac tube carb sync gauges work.

And another thing, where  the moon is in relation to earth, it's own gravity in opposition to earth's then causes the sea water to rise, as in the tidal movement.

I'm nowhere near good enough at physics to place maths on top of this 

This is basic biology and physiology surely 😂😂😂😂 For a pump to work at its optimum efficiency, the volume and viscosity of the given fluid needs to be at its 'standard' norms for it to pump correctly. If a pump is designed to do it's optimum job, as an example, with the heart and blood pressure, two factors need to be determined. The amount of blood the heart pumps (volume) and how hard it is for the blood to move through the arteries (force) . The more blood the heart pumps and the narrower the arteries, the higher the blood pressure. So by thinning the blood artificially by say Warfarin, although the volume stays the same, the less force is required to be exerted by the pump to give the same outcome.
Therefore, going back to the oil filter question, it would appear that the viscosity of the oil would be a major factor in determining the volume of oil moved as a PSI rate 😁😁😁😁😁😁

Yes Julie, and very good contribution too. Some considerable time ago I put a link from someone on an USA forum that I believe is a consultant heart specialist, and with a view I hadn't readily considered.
Most informative he was too as he seemed to have collected some desirable high performce cars and was writing about the oil system characteristics and limitations based on his field of expertise.  I learnt quite a lot from that.

[Oddjob]

To give the tester his due, he did mention using the right viscosity oil in the engine as being something you should do as a matter of course.

I seem to recall he was using 30w but don't quote me on that. I suppose as a test to test flow rate it was as good as any, they all had to do the same test. The OE filter vastly outperformed the aftermarket BTW, oddly there were 2 OE filter manufacturers, one was Purflux and the other de Mann, the Mann was far superior, the Purflux was around the same or slightly better than aftermarket. Aftermarket BTW was K&N.

As for Hiflo being TUV tested, that's fine, but how many others have been tested and failed? If the answer is they haven't been tested then the TUV test whilst being good doesn't mean it's better than all the others. It just means they spent money the others haven't. That could mean something or nothing. 

[K2-K6]

Alot of the "testing" just seems to echo marketing bollux, thats all the stuff I've watched.

Does anyone know what criteria are tested for TUV accreditation ? and how that can impact an essentially obsolete Honda engine using oil now available that's substantially different in reality from that available when Honda designed it. Certainly it's very difficult to see how the TUV intent could cope with that. It's meaningless without knowing these things.

High flow (not hi-flo the named brand, I'll make that clear) and filtering to very low numbers in micron size are two diametrically opposed qualities, and extremely difficult to reconcile.
By it's very nature, a very low micron capability all but ensures low flow. And...it gets worse very quickly IF it catches much in the way of debris. This arrangement is emphatically not suitable for full flow systems like engine lubrication as flow is definitely king in the performance profile. Else you'd need a filter material area tge size of several football pitch.
Some claim "capable of filtering to X sized micron level" but with nothing to suport that projection in practical use while in service.
It may be that with an indirect pass through (separate pump just running a filter loop round to clean the oil) and not the main supply to the bearings, it could approach those numbers stated. But they don’t indicate under what conditions they test them to make that claim. Worthless unless that data is given, and in context of these Honda systems,  which I doubt is being critically tested by anyone.

There's so many views of debris, in filters, in sumps, on components etc. But where do they think this comes from  ? Only from failure of the oil to prevent wear in the first place.

Its not really a success to filter out all that muck, just demonstration that the oil has failed in some way. The filter, whatever it's manufacturing prominence, will simply not stop that happening.

Most reviewers don't appear to know what they are talking about.

[McCabe-Thiele (Ted)]

One of the reasons I liked my original Honda 250 Dream was the centrifugal oil filter no element fitted just had to clean it out - boy did it catch some muddy type particles.