So you have almost no vacuum because it's mostly filled with HHO? Then the HHO's not being generated in much vacuum

uhhh , when its filled with HHO theres really no need to generate more HHO.

then the piston compresses the HHO.

are you two guys thinking before you write?

There's no point using waste heat as a furnace unless you have something nearby that needs a furnace.

a house , a factory , a building , etc...

3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.