Paul, i was under the impression that removing the thermostat  will allow
more flow of water but that it would flow so fast that it would not have a
chance to be cooled of enough when in transit in the rad thus the water temp
just kept climbing higher and higher. when i was young and thought i knew
every thing i tried this trick on my 40
ford V8 flat head eng and sure enough it boiled over and i put the thermostat
back in. do you think this was just a fluke or is the rotary different.
please explain.
thanks  tom Kimsey

Well as the water gets hotter the rate of heat transfer to the air in the
rad gets better and better up to a point. The rate of heat transfer from 
the block to the water gets worse and worse. It is the temp of the block we
are concerned with and not the temp of the water per se. As the water flowing  
through the block increases the turbulence probably increases which improves heat 
transfer between the block and the water. Also as the rate of water flow 
increases in the block steam bubbles are more likely to be carried away. 

These are just some of the factors. Your guess is as good as mine. 

You can always add restrictions to the water flow but it is real tough 
to reduce the restrictions and increase flow. One of the ways to reduce 
the flow is cut down on the size of the e-shaft pulley driving the pump 
or increase the size of the pulley on the water pump thereby decreasing 
the speed of the pump. In that case that saves HP. One can always put a 
larger rad in the system and then restrict flow if that seems to help 
but I doubt it.

Paul Lamar
 
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