norm2 wrote:

Things are starting to come together!  I sent the motor mount plate to the
hydrocutter today, and am getting ready to order the engine instrumentation.
Now for the numbers game!

Where do you set the redline for the oil temperature and for the water
temperature?  I have seen numerous numbers bantered about, and am looking
for a reasonable justification for where I set the warnings.

Also, Mazdatrix sells a pulley for the crank to slow down the belt speeds.
Seems to me this is appropriate for our application where we are running
continuously at 5000 or 5500 rpm.  Is there a target waterpump rpm
associated with the design?  Or is this all conjecture as well?

If it were me I would shoot for 200 F on them both. On an aircraft engine
that is generated continuous power of 150 to 200 HP I don't think you
can be too cool. Do the best you can on the cooling and hope for the
best. 220 F on the oil and you are in real trouble. Same for the water.
The real temps in the engine are much hotter than that. Consider putting
the thermocouples in the rotor housings and keep those temps to less than
400 F. That is the bottom line on rotor housing cooling.

I would not do the water pump pulley trick just yet. That is mainly for racers that
will run the engine well over 8500 RPM.

Paul Lamar
 
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