problem is with the heat you have to extract from the steam before you can shove it back into the cylender.
water evaporates and takes in heat, to recondese it lets out heat....
so you end up running a radiator and fan arrangement on the recirculated water..... maybe something more elaborate even.
square one anyone?
with the 6 stroke setup, woulda thought youd have to run a few fully fuel cycles before it warms up enough to start hitting the water cycles.
oh the colder engine = richer mixture, i dont think is quite right.
colder air = denser air = more oxygen in the cylender for combustion.