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Daox the type of pump I was thinking of is a small power steering pump or maybe a oil pump but these may have poor eff (leaky). I know the older style gear pump is not vary eff. I heard that power steering pumps are vane style. Dr jerryrigger suggested a pressure washer pump. It would be nice if a power steering pump would work because it already has the pulley so it might be easier to adapt.
old tele man your right there would be a weight penalty but it would depend on how much water your hauling. Really it would only be significant for an open system, a closed system wouldn't need to store vary much water.
Eco 86 your right about this being complex issue, But I think the main point of this thread is to discuss DIY ways that it can be done. By using already available parts it is really a matter of plumbing and fittings. The exhaust "boiler" might be the only part that needs to be fabricated, but so far in the discussion its only a matter of welding tubing together no machining. In contrast a good power producing sterling engine needs to be designed and fabricated from the ground up using lathe, milling and welding, so it also is not exactly DIY friendly.
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