They sort of are in a way, but only as a source of quick and easy fire. In this diagram, the blood and holy water are both consumed at a decent rate, making the engine actually powered by them. You could say it’s powered by the collapse and regeneration of the vampire, but that’s a perpetual and unavoidable side-effect of putting the holy water and blood into the chamber, much like the explosion in ICEs are the side effect of putting gas into a chamber and then sparking it.
Maybe it only takes a little bit of blood? Does it have to be human blood? If the premise is that the energy comes from ‘God’s wrath’ then it could be assumed that the energy generated by a single piston thrust is at least significantly higher than the caloric energy contained in the blood spritz itself.
Even better: vampires can be produced. Found guilty of genocide or some other unforgivable crime against humanity? You get bitten, and turned into another vampire, so you can produce green power for eternity.
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