The 2nd gen RX8 is weird.
The last one looks more like a RX7 2nd
gen
Paul
Paul,
If we think of impeller leading edge as a wing gently entering the water
stream... and then the trailing edge mimicking a extended wing flap...
directing as much water as possible into the pump housing scroll.
The computer model helps us not stall the "wing" or congest the flow at
any point on it's surface (or between adjacent surfaces). We would like
to have each section do equal work.
Then Mazda's new design makes more sense.
Barry Bordes
The water must make a sharp right angle. It comes in on the same axis as
the pump shaft.
Then it must turn 90 degrees and flow outward towards the housing scroll.
The device that does this well, using air, is a turbo charger compressor
wheel.
I suspect a good water pump would work the same way. I could be wrong of
course
but I would like to see some comparison data and a CFD before I would be
convinced.
Turbo charger compressors are hard to make. They are probably machined
on a 4 or 5 axis
NC mill. Too costly for a car.
High pressure die casting them would be very hard to do I suspect. The
mold must be
made in perhaps multiple parts to get the finished product out of the
mold. Very expensive.
In the case of a water pump It may be necessary to make them in iron or
steel for long life.
That prevents high pressure die casting.
In the case of the 2nd gen RX8 that could be done in a simple iron or
steel sand or ceramic casting.
There are no 3D double curved surfaces. It is probably better than the
stamped steel
first gen RX8 or 3rd gen RX7 impellers.
It remains to be seen if the aluminum after market NC Mill impeller
will hold up for long periods.
We are using the KSE water pump on the time to climb. How that is made I
know not.
Paul Lamar
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