This project seem very interesting <a href="https://www.youtube.com/watch?v=wpEG0ATylzo" target="_blank" rel="nofollow noopener noreferrer">Pedal-Powered (Vacuum) Zeolite Refrigerator - YouTube</a> any tried it before ? i was just wondering if i can replace the...

if the engine is made from cast iron then water + heated iron = rust ??

count me in also K..i like the idea of yours.. well,btw i this is the very first post..and hi everyone!