> >"Schertz, William W." wrote:
> >>
> >> Here is a sketch of my setup for the pump tests.
> >>
> >> Bill Schertz
> >Don Dunbar wrote
> Hi Bill,
> You have done a great job there.
> I take it that your test was done with the standard pump and thermostat
housing without the thermostat.
> I will send you the test on the pumps that I have test once I have
completed this task.
> Regards Don
---------------------------
Actually it is a standard pump, but I had to modify it to fit under the cowl
of my plane, so I have cut off part of the pump outlet, where the thermostat
was placed, and then machined (with a router-table) the partition out to
enlarge the flow path for the exit water. It is very similar to the
modifications that Paul Lamar did.
I would be VERY interested in your pump tests, since I believe that Mazda
chose the worst possible location for their pump. Any coolant loss will
result in the pump losing its prime, and loss of cooling. A low mounted pump
is much more forgiving.
I had a 1970 Mercedes that developed a slow coolant leak at the water pump
seal. The first manifestation of this was after driving at highway speeds,
coming to a stop light the temperature guage would start to rise and the
engine overheat. As soon as you accelerated, the temperature would drop to
normal. What was happening was that the pump at low RPM could not generate
enough head to push the water over the top into the radiator. At higher rpm
it generates more pressure, and water flowed, cooling the engine. That is
one reason I was interested in the flow rates at different RPM.
Bill Schertz
KIS Cruiser #4045
Many of the more modern engines have the pump mounted low. This also
increases the head on the intake side of the pump making cavitation
less likely. With Richard's new aluminum milled end housing you have the
opportunity to place the water pump almost anywhere on the hot side
of the engine. A Subaru pump is particularly adaptable as the intake
is entirely separated from the mounting surface.
Paul Lamar
The AirCraft Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/
Copyright 1998-2002 All world wide rights reserved.