Perhaps its time for a new front cover. The best place for the water
rad is
turning out to be on the spark plug side of the engine.  Unfortunately
that
complicates the pluming somewhat because the water pump inlet and
outlet are
on the other side of the engine.  Perhaps we should take a page out of
the
RX8 design and make a new front cover incorporating the water pump
housing
with the water coming out and going in on the other side of the engine.
Another problem is the pump should be mounted as low as possible so
any drop
in water level will not cause the pump to cavitate.  We built some remote
pumps a few years ago that used the stock Mazda pump cartridge.  One
other
point is the pump would be more eff.  if the water came stright into the
impeller.  Here are some shots of that remote pump.  I am looking for
feed
back here.  Does anybody else have an ideas they would like to see
incorporated.


  Paul Lamar

 Paul,


    A new housing incorporating some of the accesories would be
welcome.  I
originally wanted to locate my pump lower than the engine toward the plug
side as the
 exhaust side has the pipes and muffler to the augmentor.  I was going to
use
 the Toyota pump.  I also would like to get a later front housing so I
can
 use a trigger wheel.  This also permits mounting the alternator on the
plug
 side.

 Joe Berki
 Limo EZ


Mazier Enterprize here in Escondido, CA makes very light weight remote
electric water pumps in there racing aps...Mount anywhere you want,
firewall, inline off rad, ect.   The quality is superb and they have
done this along time.

They have a variety of units with different flow volumes mounting
arrangements.  they have a web, check it out.........

Being electric does this remove it from AC use??????????


jeff

Excerpt from my book How to Cool Your Wankel.

"Some have advocated replacing the mechanical pump with an electric pump. The Mazda 13B rotary requires about three HP to drive the mechanical pump at 6000 RPM and provide the coolant flow necessary to keep the metal temperature near the combustion chamber within bounds. The flow rate required is on the order of 30 to 40 gallons per minute."

"In the last 100 years there have been no breakthroughs in impeller shapes that would allow a significant improvement in water pump efficiency. On the contrary impeller shapes have been simplified to lower the cost.  Here are some photographs of a  second generation  and third generation Mazda 13B water pump impellers."

"Therefore it would also require about three HP from an electric motor driving a coolant pump to provide sufficient water flow. There are 746 watts in one HP so three HP is a minimum of 2,238 watts. Since the electrical system voltage is 12 volts and watts is equal to voltage times current it would require about 186 amps out of the alternator just to provide the required coolant flow. None of the after market car electric coolant pumps available claim that magnitude of current drain so obviously they cannot pump enough coolant to keep the metal temperature within bounds in a rotary engine generating 150 HP continuously. This is not just an opinion. It is based on the laws of physics. If one wants to reduce the water flow rate in the engine and take one's chances one must install thermal couples near the combustion chamber to monitor the metal temperature."

End quote.

All electric water pumps,we have tested so far and that includes  Mezier do not draw anywhere near enough amps to to pump the water at the required rate.

High water flow velocity in the block helps transfer heat from the metal to the coolant. If this does not happen hot spots in the rotor housings could occur. The heat going into the metal is directly proportional to how much power the engine is generating on a continuous basis. An electric  water pump that might work in a car where anything over 40 HP is a rare and temporary occurrence will not work in an aircraft engine. One could be fooled by relying on the water temperature alone. The water temperature could be below 200 F while the metal temperature in the rotor housing could be over 500 F in the hot spots.


Paul Lamar