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

I told my wife to order the book for Xmas..........


jeff

OK Jeff thanks. Merry Christmas.

Paul Lamar