SOHC.co.uk Forums > CB350/400
400 Four Oil filter - "genuine" or "aftermarket" ?
McCabe-Thiele (Ted):
Yes it was Ken, at the time we had a Nissan r3mR that came with a set of new fillter from the PO they were branded Boschi.
When I fitted the new oil filter the oil light took ages to go out after the car had stood for a few minutes. I did not move it off our drive I went to a local firm & fitted a Mahle one - problem sorted - poor valve unit in the canister.
Oddjob:
I was watching one yesterday with someone from Poland? doing the testing.
He said something pretty interesting which I didn't know. It sounds plausible so maybe it's correct.
One of the test was for flow rate, a litre of oil was suspended over a container which had a portion of the filter paper inside it, the oil was timed to see how long it took to pass through the paper using just gravity. What he did mention though was that the oil needed to be warm, 30 degrees I seem to recall. If it was cold the oil just didn't pass through, or it did but like 2 drops every minute. So he claimed the oil in the engine bypasses the filter via the relief valve until it's thin enough to pass through the filter, not something I was aware of but is it true?
Bryanj:
Doubtful Ken the pump pressure beats gravity by a helluva lot
Trigger:
--- Quote from: Bryanj on September 08, 2023, 02:08:31 PM ---Doubtful Ken the pump pressure beats gravity by a helluva lot
--- End quote ---
How many PSI is gravity Bryan ;D ;D ;D
K2-K6:
--- Quote from: Trigger on September 08, 2023, 02:14:52 PM ---
--- Quote from: Bryanj on September 08, 2023, 02:08:31 PM ---Doubtful Ken the pump pressure beats gravity by a helluva lot
--- End quote ---
How many PSI is gravity Bryan ;D ;D ;D
--- End quote ---
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 ;D
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