hi..again! I was just recently reading about Mazda Wankels Thermostat
instead of taking it off why not try a Moroso Water Outlet Restrictor
and they are cheap!!! like 7 or 8 bucks also you can make them or
machine them you can get them at www.summitracing.com,has
<http://www.summitracing.com,has
<http://www.summitracing.com,has/ any one tried reduction pulleys? like
the one in the above pics from www.xtremerotaries.co
<http://www.xtremerotaries.co <http://www.xtremerotaries.co/ they
are made for high rpm engines it
will help with cooling and reduce rotating mass freeing up some HP!!!!
has anyone tried electric water pump? im just curious on this one and
also it will free some more HP!!!....hope I helped on this one!

Javier Perez

You want to increase water flow in an aircraft engine and not restrict
it.

Same goes for an electric water pump.
The water pump in a rotary consumes only 3 HP.
Don't use an electric pump in an aircraft engine.

Paul Lamar

The guy that built the Endurance used 2 electric water pumps with speed
controls on them.

Darren

First what is an Endurance?

Paul Lamar

Endurance and Endurance GT(Grand Turismo) also variants to races like
RoadRace,GrandPrix or Le Mans24 these are races with long hours of
vehicle(race car) use. the reason I suggested re-stricter or was since
rotaries run hot!!! was to slow down engine coolant a bit, for
better cooling dissipation instead of free flow since rotaries run better
at temperature, too cool and engine performance suffers a lot. I
used pulleys to slow flow of coolant a bit, rotaries water pump create
air bubbles and a lot of cavitation at high RPM, I had melted a lot of
manifolds,headers,turbos and warp housings due to improper cooling, as a
racer and I have seen and used pulleys,pumps and restrictors on my race
car and is being used on road races and endurance races instead giving
it free flow, I'm new on the airplane dept. I really dont know much of
this in an airplane application but it should be dealt with......
Javier Perez

That is an urban myth. You want faster water flow not slower.
Think fire hose and house fire. You would not put out a house
fire with a garden hose.

Restricting a centrifugal water pump on inlet or out put causes caviatation.

Block the inlet or outlet and see what happens.

Paul Lamar


Cooling system discussions of merit:

http://www.arrowheadradiator.com/14_rules_for_improving_engine_cooling_system_capability_in_high-performance_automobiles.htm

http://www.stewartcomponents.com/tech_tips/Tech_Tips_6.htm

But it would not surprise me to learn that for a given engine design
there is some maximum flow rate of coolant beyond which cavitation
occurs in the cooling passages of the engine block .... leaving you
with disastrous hot spots.  Leaves me wondering if there are ways to
streamline (via some process akin to porting and polishing intake and
exhaust passages in conventional cylinder heads) the cooling passages
to delay the onset of cavitation as flow increases.  Hmmmmmmm!

SD

Cavitation does not occur in the block. Increased flow in the block causes increased turbulence which is a plus for heat transfer from the metal to
the coolant. The bottom line is low metal temperature. Mazda puts small
holes in the rotor housing coolant passages to increase the turbulence.


Paul Lamar