Need Info on this engine

[tractor162003]

Does anyone have the plans or any info on it. I made it some time a go and can only find part of the plans, no name or any info on what I have.
This is one of the best running engine I have made will run on about 5 psi.

 

[deverett]

Here's the link to the plans:
https://www.homemodelenginemachinist.com/threads/ez-engine-for-beginners-13nov09.29251/
Dave
The Emerald Isle

 

[tractor162003]

Thanks Dave

I had most of the drawings but did not have the Instructions.
I have one question, what is the part on sheet Piston Valve 2 on the right side that is mark Both Ends