the optimum water to fuel ratio for best efficiency, i need around 9.5:1 at 320C. Much of the water injected will be recovered once it is condensed.
9.5:1 at 320 C is difficult to achieve unless the vehicle is braking. For stationary engine with solar thermal, it's not difficult to get this.
try this link and it's free
http://www.engine-expo.com/forum_200...azmi_osman.pdf