when the spark fires the HHO ignights , all of the HHO in the chamber explodes
sending the piston forward.

forcing the piston to move.

transfering the force from the explosion to the heavy flywheel.

immediately after the explosion the HHO converts back into water.

causing the vacuum.

the vacuum is caused by the imploding HHO not the piston.

then as you say the chamber fills with HHO again but the HHO
is being generated in a vacume that is being held steady as the
piston moves further out.

producing more HHO for less energy.

we have already discussed the fact that HHO cost less to produce
in a vacuum , so if you explode the HHO in a higher pressure
then you naturally get more energy from the explosion than you put into making the HHO that caused the explosion.

this is all rudimentary , currently used processes.

this is a highly possible and applicable method as everything points to its viability.

dont you agree that HHO can be generated at a lower cost
in a vacuum?

dont you agree that HHO would supply more force if exploded
in a compressed atmosphere.

you have previously stated each was true , has something changed.

we know already that hydrogen has 140 mj of energy compared to gasolines 40 mj

we know that a gasoline engine has a
power stroke
exhaust stroke
intake stroke
compression stroke

and this engine only has a
power stroke !!!

and it has 3 times the amount of energy in the fuel that powers these strokes.

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