Quote:
Originally Posted by Capo
If the static head was 25mm, this equates to 0.0361 psi or 250 pascals for water, for oil it would be less.
This would hardly be enough to drive a viscous liquid along 10 inches of shaft through relatively small clearances
I have seen first hand where with a static head of 4 feet, the friction of the connecting pipework was great enough to prevent any flow what so ever.
The rod itself will act as a positive displacement pump each time the clutch lever is operated
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If I get a 10 inch length of small bore tube, fill it with oil and then prop one end up on a 25mm block, the oil will have no trouble at all running out of the low end of the tube.
I would say there's more than enough pressure.
After all, we're only after a dribble, not a flow as such.
Also, I wouldn't exactly call the pushrod a "positive" displacement pump .. at best it drags an indeterminate amount along the shaft each time it moves.. as I mentioned before.
But no matter how much oil either of these mechanisms shift, in my judgement they will both have significantly more effect than the centrifugal forces in the bleed hole.