Doug, As I was saying don't over cool.
Some of this data was done in 1978 and was only 1500 RPM
which Mazda correctly recognized as their main rotary BSFC problem
in cars.  The same principles apply to higher RPM and power.

Ideal would be a 3 HP electric motor powered efficient water pump and
a 200 amp alternator. At high take off engine power the pump would
pump enough water to keep the housing just below 500 F.  At cruise
the voltage and current to the water pump could be cut back to keep the rotor
housing temperature high and minimize heat loss to the coolant. This could be
done automatically based on the data from a thermocouple located next to the
spark plug near the steel liner. A fixed thermostat will not do the job as
coolant temp near boiling is not a good precursor of metal temperature. Cowl
flaps maybe. Cowl flaps are not practical in a car.

Patent applied for.

Now everybody is going to scream and say Paul Lamar WAS dead set against
electric water pumps. What I was dead set against was LOW HP electric water
pumps with tiny CRAPPY impellers. If the electric water pump has a 20 amp fuse
the max HP of the pump is 20 amps times 13 volts divided by 746 or .35 HP.
Experiences has shown that is not enough pump HP to cool a continuous high power
rotary engine. You need a high HP pump and that means 200 amps. Not 20 amps. Ten
times as much.

This is nothing new. Back in the early nineteen thirties the US Army wanted a
300 degree F coolant temperature aircraft engine for the same reasons.
They did not pull it off. They did not have microcomputers in those days :)
However the P51 with cooling air exit duct flap came close.

Paul Lamar

Paul,

Forget the patent and electric pump:)  If you want to involve a micro
processor then install a bypass solonoid activated needle valve and a
calculated size tube to loop the coolant back through block before it
gets to the heat exchanger.  The solonoid is controlled by a PID
microprocessor and the PID gets its signal from the temperature CHT
sensor.  Cowl flap is the first device to use but as you mentioned it is
'about'.

PID controller set-ups has been used for many years in industrial water
system when temp. control, chemical dosing etc are necessary to keep
constant with varying conditions in flow, pressure, or temperature.  The
PID looks at trends and evens out the swings that would normally occur
using just a sensor and a motor valve.  The unit fits in the palm of
your hand and is off the shelf technology.

An 'about' case in point.  Older swimming pools having way to much or
to little chlorine. Fifteen  years ago they usually only had an ORP
meter and a chlorine metering pulse pump.  Unfortunately on busy days,
blond hair kids either had green hair and red eyes or the pool smelled
like pee from all of the  4 to 75 yrs kids:)

Doug in Japan

There is a reason I don't swim in pools :)

Paul Lamar