X-Mozilla-Keys:                                                                                 
Paul Yaw wrote:

The testing that Jeff described goes something like this. (I hope)  Run
the pump at various rpm. Maybe 1,000 rpm increments.  I'm not sure how
many test points he wanted.  At each rpm, measure flow versus pressure.
The pressure can be varied by restricting the outlet.  I will probably
use a 2" ball valve that I have laying around.  The end result of course
is flow vs. pressure throughout the rpm range.  This should give a
complete picture, or map.  The reason for this type of mapping is to
determine what part of "the curve" you are using.  At some points, a
small change of pressure will drastically alter the flow. At others, a
change in pressure will have a small affect on the flow.  If I
understand correctly the idea is not only to determine the flow
capacity, but whether or not small restrictions in the cooling system
will adversely affect flow.  Once you have the map, all you have to know
is pressure in, pressure out, and rpm.  With that you can determine
flow.  Another benefit may be in detemining the most appropriate pump
rpm.  The pump mods that Jeff has in mind may also have the pump running
in the "happy" portion of the curve so that cooling system restriction
is less of an issue.  I don't remember what the overdrive is, but I
believe that 6,500 engine rpm is about 7,200 pump rpm.  How fast does
your lathe spin?

He also said that for the most part, air and water are similarly
affected by flow restrictions.  If that is the case, just by looking at
it I can tell you that the stock Mazda pump needs a lot of help.  The
point of all the above rambling is that I need a flowmeter.

PY

 
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