I believe you are correct in that the biggest problem is the distance
(height) from the pump down to the oil.
I don't believe the tolerances on this pump are any looser than other
pumps. The volume/pressure make-up of a pump is a correlation of the
vane width, depth and length in the pump as well as the oil distribution
system.
Jack
>
> If the pump pickup and the gears themselves are close
> together, it is a
> big plus. On many other engines, the pump is directly above
> the pickup
> tube (and therfore the sump), so the vacuum required to suck oil into
> the pump gears is minor. On the B.O.P.R blocks, the pump is "miles"
> away from the pickup. However, I suspect that there is more
> to it than
> that. The B.O.P.R. pump is high-volume/low pressure, which
> would lead
> me to believe that it has looser tolerances for moving all
> that oil. I
> suspect that the vasoline packing helps fill the voids and
> create enough
> vacuum to suck the oil into the gears.
> I don't know this for a fact, but "empirical engineering"
> would seem to
> point in this direction. Any other theories?
> James J.
>
>
> James Nazarian wrote:
>
> >I've only ever done it to a pump that I recently rebuilt and did not
> >pack or otherwise prime.
> >
> >What makes a pump self priming or not?
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