These twin arrangements look really interesting. Puch experimented with pairing up pistons inside a shared combustion chamber with a Y-shaped conrod: https://en

These twin arrangements look really interesting. Puch experimented with pairing up pistons inside a shared combustion chamber with a Y-shaped conrod: https://engineerine.com/the-forgotten-twingle-engine/ https://engineerine.com/the-forgotten-twingle-engine/