X-Mozilla-Keys:                                                                                 
Al Gietzen wrote:

One check you can do is add up all the areas of the flow passages in the
rotor
housing and compare it to the area of the hose from and to the
radiators.
On the cool side of the rotor housing Mazda has actually placed some
restricter
orrifices. Another little reality check is add up the area of all the
tubes in the
radiator. I think you will find that the areas in the rotor housings are
far
larger than the hoses. I also think the same think can be said about
your
average radiator. As a quick check I got about six square inches for the
rotor
housing and about 1.3 square inches for a 1.25 ID hose and 2.4 square
inches
for a 1.5 ID hose. PL

Sorry; but I don't understand the significance of comparing these areas;
since flow is area times velocity and there is no reason to expect the
velocity to be the same at all points, particularly in the rotor where there
is a lot of turbulence.  Or that the velocity in the radiator tubes should
match that in the hose.

Al Gietzen

You are absolutely correct. Flow is area times velocity.
Sorry I should have explained that statement. The significance
is resistance to flow. A small area will have high resistance
because of the high velocity  and a large area low resistance. 
So one looks around in the system and tries to find the smallest 
area so it can be increased to lower the resistance and enhance 
the overall flow. This is an outgrowth of the fact that the
pump is not a positive displacement pump. If you increase the 
resistance anywhere in the system the overall flow is reduced. 

Paul Lamar
 
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