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So we're still talking about at least three different plans here (which is okay by me, they are all good ones, just a little hard to follow).
So pumps: the pump would be quite different dipending on what we are doing with the steam. I'm a fan of very high pressure, but there are a lot of draw backs to this. With a pump you need it's rating to exceed the pressure made by the steam and a flow rate that can match or exceed what you want for red lining with WOT (which I suppose could be the same as what you want at 3k RPM's). Also we must consider the flow rate to water supply. It would be best if one only had to fill the water tank once per gas tank (long term, not necessary for proto-type, just should think about it). Recovering condensed water seems like a good idea, and could result in less energy loss.
As far as a controller the pulley is a nice simple way of making the flow proportional to RPM, but is that really good? I downshift for DFCO, which could result in over cooling the boiler and blasting water into the turbine. I think to integrate this into a modern engine we would need some temp and pressure sensors hooked up to a simple possessor that would control a PWM run 12V pump.
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