X-Mozilla-Keys:                                                                                 
Fredmoreno@aol.com wrote:

The curves made me scratch my head for a while.  It is not a normal pump
curve presentation which usually puts flow rate along the horizontal axis,
and pressure rise along the vertical axis.  You then get a family of curves
for various RPM.  To fully define pump performance at various RPMs you need
this type of presentation with multiple curves.

The way I read this chart is as follows:

Go to the 30 gpm vertical line.  The normal engine requires about 7.5 psi
move this flow rate through the block and head (cross hatched area curve).
This flow rate requires about 2700 RPM for the KSE HPD pump which puts out 27
psi.  Subtracting the engine pressure drop of 7.5 psi leaves 19.5 psi to
overcome other losses in the radiator and hoses, etc.  The upper curve shows
that the KSE production water pump must turn faster (3300 rpm) to make the
same flow, but at the higher RPM it makes more pressure as well.  So the high
performance pump provides more flow without generating higher pressures as
part of the deal.

If I read this chart correctly (and I have my doubts) it suggests that the
HPD pump has a smaller diameter impeller, but taller blade height to pass
greater flow.

This is a strange way to present data.

Fred

 
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