Atmospheric Pressure Engine using sponge piston

[Floor]

 @ Vineet_Kiran

Thanks for your interesting ideas, they inspire me in many directions.

In the drawing on the right,  the hollow piston part of the
syringe is acting as an extension of the flexible tube.

                    floor

[Floor]

@ Vineet_Kiran

I was thinking about your compressing sponge and...
see the drawing below

                            floor

[vineet_kiran]

Those designs will not work.  Compressing air(or any gas) in a air bag is not so easy. Tremendous force is required to compress any gas. Volume of spring remains same before and after compression. It will not create any change in volume.

Sponge creates change in volume after compression because of its fibrous structure.

[Floor]

@Vineet_kiran

Yes I agree that they will not work That is what I am saying with the
drawings. They are to make this clear. I don't think atmospheric pressure
works the way you are saying it does.

                    Sorry if I have wasted your time
                             floor