Don Dunbar wrote:

Hi Paul and group,
I have some more information on my water pump research.
In the photo attached on the left is the series 6 or 93 to 99, on the
right is series 5 or 91 to 93.
Series 6 weight is 2,0 kg  or 4.4 lbs.  Series 5 weight is 3.25 kg or
7.15 lbs.

Both are without thermostat and housing as they are both the same size.
The series 6 could be lightened of more than the series 5.
Water pumps are different with the series 6 being smaller in diameter
which would have a smaller  output in volume.

My friend who races normally aspirated engine and has been a workshop
supervisor for one of the Mazda dealer here tells me that the series 4
engine has a lot larger flow through the engine with bigger pumps and
water passages throughout.

The series 4 had cooling problems as the water traveled through the
engine too fast, there is a vast difference in output hp and the series 6
of mine runs cool even in high temps over high speed hours of running.
The aluminum water pumps on series 4 and 5 are an after market supply
and cost around $90 Aus.
Regards Don

       Don,
       Can you provide us with the name of company that can supply the series
 4 and 5 aluminum pumps in US or from AU?

     Kelly Troyer

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