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The engine requires a restriction in order to build up water pressure, which helps eliminate hot spots in the engine; and serves to hurry along water vapor that will have a tendency to sit over the hot spot where it formed instead of allowing water through.
If you remove the thermostat, install a restrictor in it's place to allow the pump to build up some pressure. The exact size of the restrictor hole needed depends on the size of the engine, water pump flow rate, water pump RPM, heat load, and a ton of other things, but a 1/2" or 5/8" hole would be a good start for a rotary.
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